CJ 381 Stats Test #1

Here are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the spring term. Please answer the question(s). Fall- 87,91,69,78,82,82,61,82 Spring- 66,92,85,77,64,88,80,72 The mean for the Spring is:

78

A national pollster prior to a presidential election determines that 16 states can be classified as Blue (democratic), 19 states as Red (republican), and 15 states as Purple (undecided). What percentage of states are Red?

38%

For the following set of data, calculate the mean: {24, 95, 72, 24, 57}

54.4

For the following set of data, calculate the median: {24, 95, 72, 24, 57}

57

A national pollster prior to a presidential election determines that 16 states can be classified as Blue (democratic), 19 states as Red (republican), and 15 states as Purple (undecided). What percentage of states are blue and purple?

62%

Here are two distributions of final scores for separate statistics course. The first is from the Fall term, the second is from the Spring term. Fall- 87,91,69,78,82,82,61,82 Spring- 66,92,85,77,64,88,80,72 The mean for the fall is:

79

Here are two distributions of final scores for separate statistics courses. The first is from the fall term, the second is from the spring term. Please answer the question(s). Fall- 87,91,69,78,82,82,61,82 Spring- 66,92,85,77,64,88,80,72 The variance for fall is:

82.5

The incoming cohort of juveniles in a new diversion program consists of 80 males and 120 females. Of this cohort, 140 graduate early. What is the early release rate?

.70

A national pollster prior to a presidential election determines that 16 states can be classified as Blue (democratic), 19 states as Red (republican), and 15 states as Purple (undecided). What proportion of states are Blue?

0.32

The incoming cohort of juveniles in a new diversion program consists of 80 males and 120 females. Of this cohort, 140 graduate early. What is the proportion of male participation in the program?

0.40

For the following set of data, calculate the mode: {24, 95, 72, 24, 57}

24

Here are two distributions of final scores for separate statistics course. The first is from the Fall term, the second is from the Spring term. Fall- 87,91,69,78,82,82,61,82 Spring- 66,92,85,77,64,88,80,72 The range for Spring is:

28

Here are two distributions of final scores for separate statistics courses. The first is from the Fall term, the second is from the Spring term. Please answer the question(s). Fall- 87,91,69,78,82,82,61,82 Spring- 66,92,85,77,64,88,80,72 The standard deviation for fall is:

9.08

Here are two distributions of final scores for separate statistics courses. The first is from the fall term, the second is from the Spring term. Please answer the question(s). Fall- 87,91,69,78,82,82,61,82 Spring- 66,92,85,77,64,88,80,72 The standard deviation for Spring is:

9.53

If the variance of a sample is 16, then the standard deviation is.... A) 4 B) 5 C) 256 D) 225

A) 4

A social researcher is interested in studying the relationship between an abstinence-only program and teen pregnancy. To test her hypothesis, she compares the results of 50 teens participating in an abstinence-only program to 50 teens participating in a more conventional sex-education program. What type of research is this? A) Experiment B) Survey C) Content analysis D) Secondary analysis

A) Experiment

Nominal measurement is used primarily to: A) name or categorize data B) rank order data C) both of the above D) neither of the above

A) name or categorize data

Deviation refers to: A) the distance of any score from the mean B) the number of scores not equal to the mean C) the distance of any score from the median D) none of the above

A) the distance of any score from the mean

A synonym for variability is: A) width B) summary C) average D) none of the above

A) width

What is the midpoint of the class interval 80-89? A) 83.5 B) 84.5 C) 84 D) 83

B) 84.5

What is a scientific journal A) a piece of scientific research that has not yet been published B) a collection of articles written by scientists that have been peer reviewed C) a notebook kept by scientists containing important details of all their own experimental research for future reference D) a collection of articles written by scientists that have no yet been reviewed by other scientists in the field

B) a collection of articles written by scientists that have been peer reviewed

In which of the following research strategies is the independent variable manipulated? A) Participant Observation B) An experiment C) a survey D) all of the above

B) an experiment

Interval/ratio measurement is used primarily to: A) name or categorize data B) assign a score C) both of the above D) neither of the above

B) assign a score

Ordinal measurement is used primarily to: A) assign a score B) rank order data C) both of the above D) neither of the above

B) rank order data

Which measure of central tendency is most appropriate for a skewed distribution? A) the mean B) the median C) the mode D) a and b

B) the median

Which of the following is a measure of variability: A) the mode B) the standard deviation C) the median D) none of the above

B) the standard deviation

The United States census occurs every 10 years and aims to have each American household answer a series of questions. What type of research is this? A) Secondary Analysis B) Survey C) Content Analysis D) Experiment

B- Survey

A comparison of the actual number of people who violate the speed limit to the total number of drivers is an example of _______ a) proportion b) a rate c) a ratio d) percentage

B- a rate

As a measure of central tendency, the mean: A) is applicable to all levels of measurement B) will always be a whole number C) can often be used for more advanced statistical operations D) is unaffected by extreme scores

C) can often be used for more advanced statistical operations

_____ typically are used to display continuous measures. A) pie charts B) bar graphs C) histograms D) all of the above

C) histograms

The most frequently occurring value in a data set is called the ____ A) mean B) median C) mode

C) mode

Which measure of central tendency can be applied to nominal data? A) mean B) median C) mode D) a and b

C) mode

The cumulative frequency is defined as the: A) number of scores at any given value B) number of scores below any given value C) number of scores at or below any given score D) number of scores above any given value

C) number of scores at or below any given score

The difference between the highest and the lowest values in a distribution of scores is known as the: A) deviation B) midpoint C) range D) median

C) range

In a bimodal distribution of scores, central tendency is best measured by: A) the mean B) the median C) the mode D) all of the above

C) the mode

In a negatively skewed distribution: A) the median is larger than the mode B) the mean is larger than the mode C) the mode is larger than the mean D) the mean is larger than the median

C) the mode is larger than the mean

In a positively skewed distribution: A) the median is smaller than the mode B) the mean is smaller than the mode C) the mode is smaller than the mean D) the mean is smaller than the median

C) the mode is smaller than the mean

Variability refers to: A) the number of scores in a sample B) the precision of the sample mean C) the spread of the sample scores D) none of the above

C) the spread of the sample scores

The sum of all deviations from the mean is equal to: A) the mean B) the mode C) zero D) the median

C) zero

A team of researchers is interested in determining how national political figures have been depicted historically on TV. The researchers painstakingly review the content of archival video footage to determine how objective and accurate the depictions are. What type of research is this? A) Experiment B) Survey C) Content Analysis D) Secondary Analysis

C- Content Analysis

Joining a radical environmentalist group to understand group dynamics and gather data over time is an example of which research strategy? A) Meta-analysis B) Experiment C) All of the above D) Participant observation

D) Participant Observation

A social researcher is interested in studying patients sense of spiritually to see if it correlates with how well they respond to treatment. She only reviews archival data previously collected in a scientific manner. What type of research is this? A) Experiment B) Survey C) Content analysis D) Secondary analysis

D) secondary analysis

A distribution with an equal mean, median, and mode is said to be: A) bimodal B) positively skewed C) negatively skewed D) symmetrical

D) symmetrical

The ______ and the _______ are two of the most popular and useful methods of standardizing for size and comparing distributions. A) Proportion; percentage B) Median; midpoint C) Percentage; midpoint D) Proportion; percentage

D- Proportion; percentage

Statistics can be used to: A) Reduce data to more easily understood descriptive terms B) generalize results C) Determine when an observed difference between two or more groups is the result of chance, or when it is the result of "real" differences between groups D) All of the above

D- all of the above

Here are two distributions of final scores for separate statistics course. The first is from the Fall term, the second is from the Spring term. Fall- 87,91,69,78,82,82,61,82 Spring- 66,92,85,77,64,88,80,72 Which semester's scores are more consistent?

Fall

A symmetrical distribution has no variation (T/F)

False

Scores that have a small standard deviation are relatively inconsistent (T/F)

False

Symmetrical distribution has no variation (T/F)

False

The standard deviation and interquartile range measure dispersion the same way (T/F)

False

The higher the standard deviation the greater the variation (T/F)

True

The standard deviation is a more effective measure of variation than the range (T/F)

True