EXAM 1 TB

If everyone in a classroom scores the same on an exam, the variance is a. 0 b.1 c. −1 d. unable to determine

0

What is the mean of a z score distribution? a. 0 b. 1 c. 10 d. 50

0

What area of the normal curve lies between a z score of .48 and a T score of 42? a. 0.00 b. 10.00 c. 18.44 d. 31.56 e. 50.00

0.00

In a normal distribution, the mean divided by the median equals a. 0.00 b. 100 c. 1 d. a figure that cannot be calculated

1

Karen's T score was 65. What is her z score? a. 0.5 b. 1.5 c. 2.0 d. need more information

1.5

consider the following data: 8, 10, 12, 14, 7, 5, 9, 10. What is the mode? a. 9.0 b. 9.4 c. 9.5 d. 10.0

10.0

After administering a test, your instructor decided to develop norms for it. Year1:N=60;ΣX=560;ΣX2 =7880;SD=1;M=14. Year 2: N = 40; ΣX = 450; ΣX2 = 4905; SD = 3; M = 10. What is the mean of the combined classes? Round to the nearest tenth. a. 10.1 b. 11.1 c. 12.0 d. 13.0

10.1

The best estimate of the median of the measurements 5, 10, 7, 11,8,18,13,and12is a. 11 b. 11.5 c. 10 d. 10.5

10.5

if a normal distribution of scores has a mean of 47 and a standard deviation of 11, what range of values would contain 99.74% of the scores? a. 14 to 80 b. 25 to 69 c. 30 to 64 d. 36 to 58

14-80

Approximately what percentile is associated with a raw score located 1 standard deviation below the mean in a normal distribution? a. 40 b. 35 c. 22 d. 16

16

If a normal distribution of scores has a mean of 70 and a standard deviation of 10, approximately what percentage of students scored below 60? a. 2.5 b. 16.0 c. 50.0 d. 84.0 e. 97.5

16.0

What is the variance of a distribution having the following statistics: N = 25; ΣX = 125; ΣX2 = 1025? a. 13 b. 15 c. 17 d. 19

17

In a fairly large, normal distribution with a mean of 15.0, two- thirds of the cases fall between the score points 12.5 and 17.5. The standard deviation can be estimated to be close to a. 1.0 b. 2.5 c. 4.0 d. 6.25

2.5

The mean on a test was 50 and the standard deviation was 20. What percent of people scored between a z score of .80 and a raw score of 68? a. 2.78 b. 18.41 c. 21.19 d. 28.81

2.78

Consider the following data: 8, 10, 12, 14, 7, 5, 9, 10. What is the standard deviation? a. 2.8 b. 8.0 c. 9.0 d. 10.0

2.8

Consider the following: mean = 196, standard deviation = 14, and N = 17. What is the raw score for a z score of 0.35? a. 207 b. 205 c. 203 d. 201

201

What score from a distribution having a mean of 30 and a standard deviation of 5 corresponds to a z score of -1.5? a. 22.50 b. 25.00 c. 30.00 d. 37.50

22.50

T score = 43. What is the percentile? a. 24.20 b. 25.80 c. 34.13 d. 43.06

24.20

What percentage of the cases would you find in a distribution between the median and Q3? a. 25% b. .34% c. .50% d. unable to determine from given information

25%

What score represents P16 if the mean of the distribution is 300 and the standard deviation is 10? a. 295 b. 290 c. 275 d. 265

290

The z score of -.50 represents what percentile? a. 30.85 b. 19.15 c. 38.30 d. 50.00

30.85

What is the standard deviation of a distribution having the following statistics: N = 25; ΣX = 125; ΣX2 = 1025? a. 2 b. 3 c. 4 d.5

4

What T score value is associated with a score of 15 from a distribution having a mean and standard deviation of 25 and 10, respectively? a. 35 b. 40 c.45 d. 60

40

. SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. A student's SAT score was at the 30th percentile. What was her raw score? Round to the nearest whole number. a. 416 b. 426 c. 448 d. 466 e. 486

448

Put score limits on 95 percent of the scores when the 84th percentile is a score of 60 and the 16th percentile is a score of 50. a. 50 to 60 b. 45 to 65 c. 40 to 70 d. 35 to 75

45 to 65

With a mean of 27.1 and a standard deviation of 3.9, the T scores for the raw scores 26 and 32 are a. 36 and 65 b. 42 and 59 c. 46 and 61 d. 47 and 63 e. 49 and 60

47 and 63

What is the T score for the 43rd percentile? a. 48.20 b. 48.52 c. 49.30 d. 49.82

48.20

What is the standard deviation of the combined classes? Year 1: N=60;ΣX=560;ΣX2 =7880;SD=1;M=14.Year2:N=40;ΣX= 450; ΣX2 = 4905; SD = 3; M = 10. Round to the nearest whole number. a. 2.0 b. 3.0 c. 4.0 d. 5.0

5.0

The mean on a test is 200 and the variance was 400 points. What percentage of people scored less than 170? Round to the nearest whole number. a. 7 b. 13 c. 43 d. 87

7

The mean on a test was 200 and the standard deviation was 20 points. What percent of people scored less than 170? Round to the nearest whole number. a. 7 b. 13 c. 43 d. 87

7

For a 100-point test, the cutoff for an F is 60 points. With a mean of 74 and standard deviation of 10, how many students out of 100 would receive an F? a. less than 1 b. 8 c. 15 d. more than 20

8

Consider the following data: 8, 10, 12, 14, 7, 5, 9, 10. What is the variance? a. 2.8 b. 8.0 c. 9.0 d. 10.0

8.0

If IQ scores are normally distributed with a mean of 100 and a standard deviation of 15, what percentage of the population has IQs between 85 and 130? a. 34.13 b. 68.26 c. 81.85 d. 95.44

81.85

Consider the following scores: X = 11, 10, 9, 8, 7, 6, 5; and f = 4, 5, 5, 4, 3, 3, 1. What is P50? a. 7 b. 8 c. 8.5 d. 9 e. 9.5

9

Consider the following data: 8, 10, 12, 14, 7, 5, 9, 10. What is the range? a. 2.8 b. 8.0 c. 9.0 d. 10.0

9.0

Consider the following data: 8, 10, 12, 14, 7, 5, 9, 10. What is the mean? a. 9.0 b. 9.4 c. 9.5 d. 10.0

9.4

Consider the following data: 8, 10, 12, 14, 7, 5, 9, 10. What is the median? a. 9.0 b. 9.4 c. 9.5 d. 10.0

9.5

If a normal distribution of scores has a mean of 70 and a standard deviation of 10, what score does it take to be 2 standard deviations above the mean? a. 50 b. 60 c. 80 d. 90

90

The z score of 1.56 is what percentile? a. 44.06 b. 94.06 c. 45.71 d. 92.71

94.06

What percentage of the normal curve lies between -2.0 and +2.0 standard deviation units from the mean? a. 47.72 b. 68.26 c. 86.64 d. 95.44

95.44

Given that variance = 100 and P16 = 985, which of the following is probably the mean? a. 965 b. 975 c. 995 d. need more information

995

. Which of the following measure represents the highest degree of relative performance? a. percentile of 90 b. T score of 72 c. raw score of 60 with mean of 50 and standard deviation of 10 d. z score of 1.5

T score of 72

What is summation notation? a. a series of Greek symbols b. an extension of scales of measurement c. the software used within PASW to generate results d. a shorthand method of describing mathematical steps

a shorthand method of describing mathematical steps

john scored at the 45th percentile on the course midterm. Which interpretation of his score is the best? a. 45% of the people tested exceeded his score b. John got 45% of the items correct. c. John had a better score than 45% of the people tested. d. More than one of these statements is an appropriate interpretation.

c. John had a better score than 45% of the people tested.

Which of the following is not a PASW command that you can use to summarize your data? a. descriptives b. frequencies c. histograms d. cluster

cluster

The variable weight (in kg) would be considered a. continuous b. interval c. ordinal d. nominal

continuous

The variables age (in years), sport, and college major would be considered _______, _______, and _______, respectively. a. continuous; nominal; nominal b. ordinal; nominal; ordinal c. continuous; nominal; continuous d. continuous; continuous; ordinal

continuous: nominal ; nominal

The variables percent body fat (%), oxygen consumption (ml/kg/min), and weight (in pounds) would be considered _______, _______, and _______, respectively. a. nominal; nominal; nominal b. ordinal; nominal; ordinal c. continuous; nominal; continuous d. continuous; nominal; ordinal e. continuous; continuous; continuou

continuous; continuous ; continuous

The variables time (in seconds), temperature (in degrees F), and triathlon event (swim, bike, run) would be considered _______, _______, and _______, respectively. a. nominal; nominal; nominal b. ordinal; nominal; ordinal c. continuous; continuous; nominal d. continuous; nominal; ordinal

continuous; continuous; nominal

The variables height (in inches), gender, and race would be considered _______, _______, and _______, respectively. a. nominal; nominal; nominal b. ordinal; nominal; ordinal c. continuous; nominal; nominal d. continuous; nominal; ordinal

continuous; nominal ; nominal

Measurement on the nominal scale is accurately described as quantitative measurement. a. true b. false

false

The first quartile corresponds to the 75th percentile value. a. true b. false

false

The larger the standard deviation, the more homogeneous the distribution. a. true b. false

false

The total area to the left of -1 standard deviation from the mean in a normal distribution represents approximately 84% of the total area of the curve. a. true b. false

false

A distribution of scores is best obtained with what PASW command? a. report b. means c. frequencies d. descriptives

frequencies

To compare two sets of data, the most appropriate technique to use is the a. frequency distribution b. frequency polygon c. histogram d. cumulative frequency polygon

frequency polygon

The graphing technique that is most appropriate for depicting the shape of a single set of data is a a. frequency distribution b. frequency polygon c. histogram d. cumulative frequency polygon

histogram

Which of the following graphs is the best choice in determining the shape of a distribution? a. bar chart b. histogram c. pie chart d. frequency table

histogram

Who did best relative to his or her classmates? That is, who had the highest percentile? a. John, whose percentile was 97% on a fitness test b. Karen, who scored 45 correct on a test with 50 questions c. Mike, whose z score was 3.0 on a written health test d. Allison, whose T score was 75 on a soccer test e. It is impossible to determine from what is given.

it is impossible to determine from what is given

Why is the range not often used for statistical analysis? a. It is too large. b. It is the easiest measure to calculate. c. It is not very reliable. d. It takes too long to figure out.

it is not very reliable

A distribution that has a large number of scores that cluster close to the mean with relatively few scores falling in either tail is said to be a. platykurtic b. mesokurtic c. leptokurtic d. heterogeneous

leptokurtic

Descriptive statistics provide a. mathematical summaries of data b. inferences about population parameters c. generalizations about distributions d. predictions regarding future trends

mathematical summaries of data

When you sum all of the X values of interest and divide by the number of values that you summed, you have calculated a a. mean b. median c. mode d. variance

mean

Which measure of central tendency is most appropriate for continuous scale measurements? a. mode b. median c. mean d. either the mode or the mean

mean

Which of the following is the arithmetic average? a. mean b. median c. mode d. variance

mean

Which of the following statistics are most commonly reported in sport and exercise science research reports? a. mean: standard deviation b. median: standard deviation c. mean: range d. mode: range

mean : standard deviation

Which measure of central tendency is most appropriate for ordinal scale measurements? a. mode b. median c. mean d. either the mode or the mean

median

Which of the following is not affected by the value of every score in the set on which it is calculated? a. mean b. standard deviation c. median d. variance

median

Which statistic requires the data to be ranked before its calculation? a. mean b. median c. average d. mod

median

Which statistic can be used with either continuous, nominal, or ordinal data? a. mean b. median c. average d. mode

mode

For a set of 5,000 scores, the mean is 98, the median is 110, and the mode is 120. Which of the following describes the distribution? a. homogeneous b. heterogeneous c. positively skewed d. negatively skewed

negatively skewed

How does one describe a distribution that has many more high scores than low scores? a. positively skewed b. negatively skewed c. normal d. rectangular

negatively skewed

With a mean of 12 and a median of 14, we can infer that the distribution is a. positively skewed b. negatively skewed c. normal d. rectangular

negatively skewed

Political party affiliation (Republican, Democrat) is an example of which measurement scale? a. nominal scale b. ordinal scale c. interval scale d. ratio scale

nominal

The numbers on the shirts of football referees represent what level of measurement? a. nominal b. ordinal c. interval d. ratio

nominal

lassifying subjects as athletes or nonathletes, male or female, from New York or Hawaii, is an example of which measurement scale? a. nominal scale b. ordinal scale c. interval scale d. ratio scale

nominal

What is another name for the z score table? a. percentile table b. T-score table c. normal curve table d. symmetrical table

normal curve table

Lining students up according to height without actually measuring height represents what level of measurement? a. nominal b. ordinal c. interval d. ratio

ordinal

the variable BMI group (low, normal, high, very high) would be considered a. continuous b. interval c. ordinal d. nominal e. ratio

ordinal

Given that the mean is 80 and the standard deviation is 10, which of the following does not belong? a. z score = -1.21 b. T score = 37.9 c. raw score = 67.9 d. P = 38.69

p=38.69

With a median of 12 and a mean of 14, we can infer that the distribution is a. positively skewed b. negatively skewed c. normal d. rectangular

positively skewed

To make statements such as 8 units is twice as much as 4 units, what level of measurement is required? a. nominal b. ordinal c. interval d. ratio

ratio

Which of the following allows for fractional comparison? a. nominal b. ordinal c. interval d. ratio

ratio

Which of the following is the highest (most sophisticated) scale of measurement? a. nominal b. ordinal c. interval d. ratio

ratio

Oxygen uptake capacity measured in liters per minute is an example of which type of measurement? a. nominal scale measurement b. ordinal scale measurement c. interval scale measurement d. ratio scale measurement

ratio scale measurement

If a distribution of test scores has an unusually high score in comparison to the other scores, what shape does it have? a. normal b. skewed left c. skewed right d. uniform

skewed right

Which words might be used to describe the shape of a distribution? a. skewness b. ICC c. variance d. range

skewness

Which measure of variability is normally reported with the mean? a. range b. variance c. standard deviation d. correlation

standard deviation

you are discussing the heterogeneity of your tennis class results with one of your fellow teachers. Which of the following terms will you probably use in the discussion? a. standard deviation b. intervally scaled c. percentile d. grouped frequency distribution

standard deviation

Which of the following represents the nominal scale of measurement? a. achievement on the SA T test b. student enrollment (ID) number c. percentage of body fat from skinfold calipers d. age of the students

student enrollment (ID) number

Which of the following represents the nominal scale of measurement? a. body fat b. test score c. student number d. vertical jump

student number

Given the following statistics, which test would contribute most to a composite score obtained by adding each student's four scores together? a. test A: M = 80; SD = 2 b.testB:M=70;SD=4 c.testC:M=60;SD=6 d.testD:M=50;SD=8

test D:M=50;SD8

Which of the following is a characteristic of ratio scale measures? a. They indicate rank-only order. b. They have absolute zero values. c. They have arbitrary zero values. d. They indicate only group membership.

they have absolute zero values

Which of the following is a characteristic of ordinal scale measures? a. They indicate rank order. b. They can express ratios. c. They have arbitrary zero values. d. They indicate only group membership.

they indicate rank order

Why are standard scores so important? a. They are related to the normal curve. b. Grades can be based on them. c. They permit scores to be compared more appropriately. d. They are easier to interpret than percentiles. e. They reduce the variability in a distribution to 1 (for z scores) and 10 (for T scores).

they permit scores to be compared more appropriately

Forced categories should not be created because of the potential loss of information. a. true b. false

true

The area to the left of 1 standard deviation from the mean in a normal distribution represents 84% of the total area of the curve. a. true b. false

true

The sum of the deviation scores from the mean will always be zero. a. true b. false

true

Total score variance minus error score variance leaves you with a. absolute score variance b. no variance c. true score variance d. observed variance

true score variance

When are the mean, median, and mode identical? a. when the sample size is very large b. when all equal zero c. when the distribution is mesokurtic d. when the distribution is symmetrical

when the distribution is symmetrical