Statistics Chapter 3 Study Questions

The cf for the highest score in a distribution should equal A. N B. its percentile rank C. f D. the highest score

A

The sum of all the individual frequencies always equals A. N B. f C. the total number of all the Ns D. the sum of all the scores

A

A graph of a frequency distribution shows the frequencies on the A. X axis B. Y axis C. top of the graph D. bottom of the graph

B

One benefit to using a frequency distribution table or graph is that it makes it easier to A. see the raw scores B. examine the relationship between scores on two variable C. see what scores occurred and how often they occurred D. determine the sample size

C

When graphing the frequencies of males and females in the class, a (blank) should be used. A. bar B. histogram C. polygen D. simple

A

For the following simple frequencies, what are the correct relative frequencies? Score: 9, 8, 7, 6, 5, 4 f: 5, 3, 9, 4, 3, 6 A. 5, 3, 9, 4, 3, 6 B. 0.17, 0.10, 0.30, 0.13, 0.10, 0.20 C. 17%, 10%, 30%, 13%, 10%, 20% D. 30, 25, 22, 13, 9, 6

B

In statistical notation "N" stands for the A. number of times a given score occurs in a sample B. total number of scores in a set of data C. relative frequency of a particular score D. cumulative frequency of a given score

B

The distinguishing characteristic of the frequency polygon is that A. the bars are shaded in B. the graph is created by connecting the dots with straight lines C. the graph does not center the bars over the scores on the X axis D. the graph centers the bars over the scores on the X axis

B

For the following data what values should be in the Score column of the frequency distribution table? 8,8,8,7,5,5,5,5,4,4,3,3,3,2,1,1,1,1,1 A. 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 B. 8, 7, 5, 4, 3, 2, 1 C. 8, 7, 6, 5, 4, 3, 2, 1 D. 3, 1, 0, 4, 2, 3, 1, 5

C

Using the frequency distribution below, what is the total frequency of scores 6 and 7? Score 10, 9, 8, 7, 6, 5, 4 f 5, 10, 13, 10, 5, 1, 1 cf 45, 40, 30, 17, 7, 2, 1 A. 0.33 B. 13 C. 15 D. 17

C

A distributing that is symmetrical, has as its middle score the score with the highest frequency, and has decreasing frequencies as scores are further from the middle score is called a(n) (blank) distribution. A. bimodal B. overlapping C. skewed D. normal

D

The percentile is defined as the (blank) of all scores in the data that are at or (blank) a certain score. A. number; below B. number; above C. percentage; above D. percentage; below

D

A graph of a frequency distribution shows the scores on the A. X axis B. Y axis C. top of the graph D. side of the graph

A

A grouped frequency distribution is used when A. there are too many different scores to produce an efficient simple frequency table B. there are too many scores to produce an efficient simple frequency table C. one wants more detailed information about frequencies than one can get from a simple frequency table D. there are about 10 rows in a simple frequency table

A

An advantage of percentiles over cumulative frequencies is that A. percentiles are often easier to interpret than cumulative frequencies B. cumulative frequencies are often easier to interpret than percentiles C. percentiles provide the proportion of scores at or below a score, whereas cumulative frequencies provide N D. cumulative frequencies are more complicated than relative frequencies

A

If the number of hot lunches sold at school this week was 1,350 and the relative frequency on Friday was 0.22, how many lunches were sold on Friday? A. 297 B. 342 C. 345 D. 388

A

In a normal distribution if 35% of the scores are between the score of 40 and the mean, what percentage of the scores are below 40? A. 15% B. 25% C. 35% D. 45%

A

In statistical notation "f" stands for the A. number of times a given score occurs in a sample B. total number of scores in a set of data C. relative frequency of a given score D. cumulative frequency of a given score

A

Which graphing the frequencies of response times from an experiment, a (blank) graph should be used. A. histograms and frequency polygons B. bar graphs and frequency polygons C. bar graphs and histograms D. bar graphs, histograms, and frequency polygons

A

In the following frequency distribution table, what is the error? Score: 7, 6, 5, 4, 3, 2 f: 1, 2, 4, 5, 0, 2 rel. f: 0.07, 0.14, 0.29, 0.36, 0.14, 0.14 cf: 14, 13, 11, 7, 2, 2 A. the frequency of the score of 3 is incorrect B. the rel f for the score of 3 is incorrect C. the cf for the score of 3 is incorrect D. there are no errors

B

Relative frequency is defined as the A. number of times a given score occurs in a sample B. proportion of the total N at a given score value C. frequency of all scores at or below a score D. total number of scores divided by the frequency of a given score

B

The (blank) of a polygon above any score corresponds to that score's (blank) A. X axis; Y axis B. height; frequency C. data; height D. relative frequency; cumulative frequency

B

The distinguishing characteristic of a rectangular distribution is that A. all the scores are the same B. all the frequencies are the same C. two scores have the same and the highest frequency D. it is always symmetrical

B

The distribution of weights of newborn infants in the American population is not symmetrical. Most weights are bunched together towards the upper end of the distribution. As weights decrease, there are fewer and fewer newborns with these weights. The shape of the graph produced by this distribution would be (Hint: Drawing a picture maybe helpful) A. a normal bell-shaped curve B. negatively skewed C. positively skewed D. mesokurtic

B

To obtain the relative frequency, we would A. count the total number of scores B. divide the frequency for a score by the total number of scores C. divide the total number of scores by the frequency for a score D. add the simple frequencies below a score to the score's simple frequency

B

What is the most frequently occurring score in the following frequency distribution? Score: 15, 14, 13, 12, 11 f: 1, 2, 3, 4, 5 A. 5 B. 11 C. 15 D. 65

B

What is the relative frequency for the score of 14 in the following simple frequency distribution? Score: 16, 15, 14, 13, 12, 11 f: 0, 1, 2, 3, 4, 5 A. 0.12 B. 0.13 C. 0.16 D. 0.20

B

Bad question

Bad question

The distinguishing characteristic of an idealized bimodal distribution is that A. all the scores are the same B. all the frequencies are the same C. two scores have the same and the highest frequency D. it is always symmetrical

C

The distribution of salaries in the American population is not symmetrical. Most salaries are bunched together at the lower end of the distribution. As salaries increase, there are fewer and fewer people with these salaries. The shape of the graph produced by this distribution would be A. a normal bell-shaped curve B. negatively skewed C. positively skewed D. mesokurtic

C

What is the N for the following distribution? Score: 15, 14, 13, 12, 11 f: 1, 2, 3, 4, 5 A. 5 B. 10 C. 15 D. 65

C

When graphing the frequencies of response times from an experiment, a (blank) graph should be used. A. bar B. histogram C. polygon D. simple

C

An advantage of relative frequency over simple frequency is that A. simple frequency is more complicated than relative frequency B. simple frequency is often easier to interpret than relative frequency C. simple frequency provides the proportions of different scores D. relative frequency is often more interpretable than simple frequencies

D

In a grouped frequency distribution different scores are combined to form small groups A. according to their frequencies B. according to their size C. but the f, rel. f, or cf is still reported for each score D. and the total f, rel. f, or cf is reported for each group

D

In a normal distribution if 5% of the scores are greater than 80, what percentage of the scores are between the mean and 80? A. 15% B. 25% C. 35% D. 45%

D

On a national qualifying exam, one student had a raw score of 85, and another student had percentile of 85. Which is better, a raw score of 85 or a percentile of 85? A. the raw score of 85 B. the percentile of 85 C. they are equally good D. you can not tell

D

In a bar graph constructed from the frequency distribution Score: 14, 13, 12, 11 f: 2, 5, 4, 3 the bar for score "12" would be (blank) units high A. 5 B. 4 C. 3 D. 2

B

In a simple frequency distribution constructed from the data 16, 16, 17, 14, 19, 19, 20, 20, 21, 21, 16, 17, 14, the score "16" would have a cumulative frequency of A. 3 B. 5 C. 13 D. 48

B

What is the cumulative frequency for the score of "7" in the following distribution? Score: 10, 9, 8, 7, 6, 5, 4 f: 2, 4, 7, 5, 3, 1, 1 A. 5 B. 10 C. 18 D. 0.22

B

What is the relative frequency for the score of 12 in the following simple frequency distribution? Score: 16, 15, 14, 13, 12, 11 f: 1, 0, 2, 3, 10, 4 A. 0.15 B. 0.50 C. 0.60 D. 0.40

B

In a cumulative frequency distribution created from the simple frequency distribution Score: 7, 6, 5, 4, 3, 2, 1, 0 f: 1, 2, 4, 5, 4, 0, 2, 1 the score "5" would have a cumulative frequency of A. 4 B. 7 C. 16 D. 20

C

In a frequency polygon constructed from the frequency distribution Score: 14, 13, 12, 11 f: 2, 5, 4, 3 which scores would be plotted at Y=0? A. 10 and 11 B. 10.5 and 14.5 C. 10 and 15 D. 15 and 16

C

In a normal curve the proportion of the area under the curve between two scores represents A. the cumulative frequency of the lower score B. the cumulative relative frequency of the lower score C. the relative frequency of all scores between the two scores D. the relative frequency of all scores below the upper scores

C

In a normal distribution with a mean of 30 what percentage of the scores would be above the mean? A. 0% B. 25% C. 50% D. 75%

C

In a normal distribution, the low-frequency, extreme scores located on the far left and far right of the distribution are called the A. scores B. peak C. tails D. curls

C

In a simple frequency distribution constructed from the data 9, 8, 8, 7, 7, 7, 5, 5, 4, 4, 4, 4, 3, 2, 2, 1, 0, 0, the score "7" would have an f of A. 1 B. 2 C. 3 D. 4

C

In terms of skewness, the normal bell-shaped curve is A. positively skewed B. negatively skewed C. not skewed at all D. rectangular

C

In the following frequency distribution table, what is the error? Score: 10, 9, 8, 7, 6, 5, 4 f: 2, 4, 7, 5, 3, 1, 1 rel. f: 0.09, 0.17, 0.30, 0.22, 0.13, 0.04, 0.04 cf: 23, 21, 17, 10, 3, 2, 1 A. the frequency of the score of 8 is incorrect B. the rel f for the score of 6 is incorrect C. the cf for the score of 6 is incorrect D. there are no errors

C

In a cumulative frequency distribution created from the simple frequency distribution Score: 7, 6, 5, 4, 3, 2, 1, 0 f: 3, 3, 3, 3, 3, 3, 3, 3 the score "7" would have a cumulative frequency equal to A. 3 B. 28 C. 84 D. N

D

Which of the following would be appropriate class intervals for a grouped distribution? A. 0-9; 10-19; 30-39; 40-49; 60-69 B. 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 C. 20-25; 16-19; 14-15; 7-13; 0-6 D. 25-29; 20-24; 15-19; 10-14; 5-9

D