BESC 3010 Test 1

If a distribution has a mean of 20, then what is the deviation value for a score of 23? cannot be calculated 9 +3 -3

+3

For a normal distribution, kurtosis is... 0 negative 1 undefined

0

If a distribution of 144 scores with a mean of 52 and a standard deviation of 12 is standardized, then the new distribution's mean will be _____. 0 1 52 12

0

What is the population variance for the following data? 4, 5, 5, 6. 0.66 2 cannot be calculated 0.5

0.5

What is the sample standard deviation for the following data? 2, 2, 3, 4, 4 1 4 0.80 cannot be calculated

1

If the mean of a sample is 5 and the standard deviation is 2, then what is the z-score for a raw score of 8? 7 1.5 3 8

1.5

What is the mode for the following data set? 1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 7 7+ 7+ Cannot be determined 2 4

2

What is the IQR for this data set? 6, 4, 6, 6, 1, 6, 3, 4. 2.5 cannot be calculated 5 0.5

2.5

If a person has a z-score of +2, what would their raw score be in a distribution with a mean of 20 and a standard deviation of 3? 43 2 23 26

26

What is the frequency of 4 in the following data set: 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 5 3/15 3 4/5 12-14

3

What is the mean for these data? 3, 1, 2, 5, 3, 4. 3 3.5 cannot be calculated 6

3

If a distribution has a mean of 50 and a standard deviation of 5, then a raw score of 68 would have a z-score of... 3.6 18 -18 cannot be calculated

3.6

What percent of the normal distribution is between z = -1 and z = 0? 13.6% 34% 68% 99.7%

34%

What is the median for the following data set? 1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 6 6 7 7+ Cannot be determined 4 7+ 2

4

What is the range for this data set? 5, 1, 2, 6, 5. cannot be calculated 6 5 2

5

What percent of the normal distribution is within one standard deviation of the mean (i.e., |z| < 1)? 1% cannot be calculated without additional information 68% 99.7%

68%

If a person got a z-score of -2 on a test that had a mean of 80 and a standard deviation of 5, then what was their raw score? 90 75 78 70

70

Which of the following distributions is leptokurtic? None of them A C B

B

Which measure of variation is LEAST sensitive to outliers? IQR range all are the same standard deviation

IQR

When a distribution of raw scores is converted to z-scores, the mean and standard deviation of the distribution will be... M=1, SD=0 M=0, SD=1 different but unpredictable the same as they were before

M=0, SD=1

Which of the following is a defining characteristic of experiments? Laboratory setting Biological measures Manipulation Representative groups

Manipulation

A frequency bar graph would be most appropriate for which measurement scales? Interval or ratio Nominal or ordinal Nominal or interval ordinal or ratio

Nominal or ordinal

A distribution such as income that has most of the people at the bottom or middle but a few people with extremely high scores, is referred to as bimodal negatively skewed unrepresentative Positively skewed

Positively skewed

The normal distribution is _____. skewed positively limited to three standard deviations from the mean a bell curve asymmetrical

a bell curve

In a positively skewed distribution, the extreme scores are _____. anything with an absolute value over 120 near the middle at the low end at the high end

at the high end

Which type of chart would be most appropriate for a nominal variable? scatterplot boxplot bar graph histogram

bar graph

This distribution can be described as _____. normal bimodal uniform mesokurtic

bimodal

What is the range for this data set? 5, 3, 7+, 1, 4. 6+ 6 1 cannot be calculated

cannot be calculated

One good use of the range is to... check for outliers help in calculations of the standard deviation separate groups of cases identify missing values

check for outliers

The variable that is measured as the outcome in an experiment is called the _____ variable. dependent independent quasi-experimental pattern

dependent

A bimodal distribution _____. cannot be used in inferential statistics is characteristic of income or house prices generally consists of two distinct populations indicates an error in coding

generally consists of two distinct populations

A chart of this type is called a... histogram box plot bar chart scatterplot

histogram

In an experiment, the variable that the researcher manipulates is called the _____ variable. skewed observational dependent independent

independent

What is the minimum level of measurement needed to calculate the mean? nominal ordinal ratio interval

interval

A narrow distribution that is sharply pointed in the middle and that has many outliers is also called _____. leptokurtic platykurtic positively skewed negatively skewed

leptokurtic

In a positively skewed distribution, which measure will generally have the highest value? mean median mode all are the same

mean

Which measure of central tendency is MOST influenced by outliers? mean median all are the same mode

mean

The three most common measures of central tendency are: mean, median, mode inferential, descriptive, explanatory variance, standard deviation, IQR nominal, ordinal, ratio

mean, median, mode

Which measure of central tendency is most appropriate for skewed distributions? no measure is appropriate mean mode median

median

Which of these measures is LEAST affected by outliers? geometric mean mean median standard deviation

median

The normal distribution is uniform negatively skewed mesokurtic bimodal

mesokurtic

In a negatively skewed distribution, which measure will generally have the highest value? median mean mode all are the same

mode

A normal distribution has a value of skewness that is _____. unmeasured near zero positive negative

near zero

A variable that classifies people into racial or ethnic groups is what level of measurement? ratio nominal interval ordinal

nominal

If a person's sex is coded as Male = 0 or Female = 1, then that variable is at the _____ level of measurement. ratio interval ordinal nominal

nominal

If a person's sex is recorded as "Male" or "Female," then that variable is at the _____ level of measurement. interval nominal ordinal ratio

nominal

The only level of measurement that does not place scores or categories into order (and is therefore the lowest level of measurement) is the _____ level of measurement. interval ratio ordinal nominal

nominal

What is the minimum level of measurement needed to calculate the mode? ordinal interval ratio nominal

nominal

If a person has a z-score of 1 on a test, then their score is... the same as it was before one point above the raw score mean the only score in the distribution (i.e., n = 1) one standard deviation above the mean

one standard deviation above the mean

What is the minimum level of measurement needed to calculate the median? nominal interval ordinal ratio

ordinal

In this boxplot, the circles on the right side of the box indicate _____. the only measured data points outliers uncertain values missing data

outliers

When a distribution is relatively flat on the top and cuts off sharply at the ends with very few outliers, it is referred to as ____. platykurtic leptokurtic u-shaped mesokurtic

platykurtic

The larger group of people from which you got your observed group and to whom you wish to generalize your results is called the _____. inferential group database sample population

population

This distribution is... positively skewed u-shaped normal negatively skewed

positively skewed

A histogram is appropriate when the data are _____. categorical quantitative ordinal from a representative sample

quantitative

The amount of time that a person spends on social media each week in minutes is a(n) _____ variable. nominal ratio interval ordinal

ratio

The highest level of measurement (i.e., the one that contains the most information) is the _____ level of measurement. ordinal ratio interval nominal

ratio

The number of students enrolled at UVU each year is an example of which level of measurement? ratio ordinal interval nominal

ratio

Which level of measurement has a true zero point? ratio interval nominal ordinal

ratio

When a distribution of raw scores is converted to z-scores, the shape of the distributions... flattens out to a uniform distribution is unpredictable remains the same approaches a normal distribution

remains the same

The group of people from whom you actually gather data is called the _____. database population sample inferential group

sample

Which measure requires a degrees of freedom calculation? population range sample IQR population standard deviation sample variance

sample variance

What are the values of skewness and kurtosis for a normal distribution? Cannot be calculated without additional information skewness = 1 and kurtosis = 1 skewness = 0 and kurtosis = 0 skewness = 0 and kurtosis = 1

skewness = 0 and kurtosis = 0

One visual difference between a bar chart and a histogram is that in a histogram... the adjacent bars touch but in a bar chart they are separate. the bars can be placed in any order. the height of the bars indicates the value on X. the bars indicate group membership.

the adjacent bars touch but in a bar chart they are separate.

If the formula for the population standard deviation were used with sample data, then result would be... too big impossible to calculate too small identical

too small

If scores in a data set are very different from each other, then the standard deviation... will be biased for the sample cannot be calculated will be low will be high

will be high