Question 1

The standard deviation is equal to the square root of the variance.

Accepted Answer

A) True 
 B)False

Question 2

If the standard deviation of some data is 0.347, what is the variance?

Accepted Answer

A)  0.35 
B)  0.12 
C)  0.69 
D)  It is impossible to determine the variance based on the information provided. 
A)  0.35 
B)  0.12 
C)  0.69 
D)  It is impossible to determine the variance based on the information provided.

Question 3

The mean of the population is represented by the symbol _____, and the mean of the sample is represented by the symbol _____.

Accepted Answer

A)  M; $\mu  $ 
B) $\mu  $; M 
C)  $\mu  $; $\mu  $ 
D)  M; M 
A)  M; $\mu  $ 
B) $\mu  $; M 
C)  $\mu  $; $\mu  $ 
D)  M; M

Question 4

If you knew nothing about your data except that it is a scale variable, which measure of central tendency would be the "safest bet"?

Accepted Answer

A)  mode 
B)  median 
C)  mean 
D)  center 
A)  mode 
B)  median 
C)  mean 
D)  center

Question 5

The mean is the measure of central tendency that conveys the middle score of the data.

Accepted Answer

A) True 
 B)False

Question 6

The _____ is a measure of variability that is calculated by taking the difference of the highest and lowest scores in the distribution.

Accepted Answer

A)  standard deviation 
B)  range 
C)  variance 
D)  central tendency 
A)  standard deviation 
B)  range 
C)  variance 
D)  central tendency

Question 7

A researcher analyzed the results of her data and calculated the standard deviation of scores at 6.7.What is the variance?

Accepted Answer

A)  2.59 
B)  6.70 
C)  13.40 
D)  44.89 
A)  2.59 
B)  6.70 
C)  13.40 
D)  44.89

Question 8

The numerical summary characteristics of a population are called _____, while the numerical summary characteristics of a sample are called _____.

Accepted Answer

A)  parameters; variance 
B)  parameters; statistics 
C)  statistics; parameters 
D)  statistics; sum of squares 
A)  parameters; variance 
B)  parameters; statistics 
C)  statistics; parameters 
D)  statistics; sum of squares

Question 9

The median is preferred over the mean for _____ distributions.

Accepted Answer

A)  normal 
B)  unimodal 
C)  skewed 
D)  symmetrical 
A)  normal 
B)  unimodal 
C)  skewed 
D)  symmetrical

Question 10

A bimodal distribution has _____ mode(s).

Accepted Answer

A)  one 
B)  two 
C)  two or more 
D)  more than two 
A)  one 
B)  two 
C)  two or more 
D)  more than two

Question 11

The median is preferred over the mean for skewed distributions.

Accepted Answer

A) True 
 B)False

Question 12

When data are based on a nominal scale of measurement, what measure of central tendency should be used?

Accepted Answer

A)  mean 
B)  median 
C)  mode 
D)  variance 
A)  mean 
B)  median 
C)  mode 
D)  variance

Question 13

In a physical geography course, the average score on the first exam across all sections of the course was 77.63 percent.Because all students were included in the calculation, the mean is assumed to be based on population data.The test average may be considered to be a:

Accepted Answer

A)  measure of variability. 
B)  statistic. 
C)  parameter. 
D)  mode. 
A)  measure of variability. 
B)  statistic. 
C)  parameter. 
D)  mode.

Question 14

If an extreme score is added to a data set, increasing the range of data, the standard deviation will:

Accepted Answer

A)  get closer to 0. 
B)  decrease. 
C)  increase. 
D)  double. 
A)  get closer to 0. 
B)  decrease. 
C)  increase. 
D)  double.

Question 15

In a sample of data that has several extremely high scores, creating positive skew, the mean will be _____ the median.

Accepted Answer

A)  less than 
B)  greater than 
C)  equal to 
D)  double 
A)  less than 
B)  greater than 
C)  equal to 
D)  double

Question 16

The variance calculated on 22 scores is equal to 28.93.What is the standard deviation?

Accepted Answer

A)  1.32 units 
B)  1.32 units squared 
C)  5.38 units 
D)  5.38 units squared 
A)  1.32 units 
B)  1.32 units squared 
C)  5.38 units 
D)  5.38 units squared

Question 17

What measure of variability is the square root of the average of the squared deviations from the mean?

Accepted Answer

A)  variance 
B)  standard deviation 
C)  range 
D)  central tendency 
A)  variance 
B)  standard deviation 
C)  range 
D)  central tendency

Question 18

Katrina observes and records the number of people who purchase a meal at the school cafeteria during each operating hour.The cafeteria is open from 6:00 a.m.to 9:00 p.m.and students typically eat breakfast, lunch, and dinner.What type of distribution should Katrina expect to see in her data?

Accepted Answer

A)  normal 
B)  unimodal 
C)  bimodal 
D)  multimodal 
A)  normal 
B)  unimodal 
C)  bimodal 
D)  multimodal

Question 19

The concept of central tendency is best described as:

Accepted Answer

A)  the average. 
B)  how the data are distributed. 
C)  the physical middle of our data. 
D)  the value around which the data seem to gather. 
A)  the average. 
B)  how the data are distributed. 
C)  the physical middle of our data. 
D)  the value around which the data seem to gather.

Question 20

The interquartile range measures variability as the difference between the scores at the 75th and 25th percentiles.

Accepted Answer

A) True 
 B)False

The standard deviation is equal to the square root of the variance.

If the standard deviation of some data is 0.347, what is the variance?

The mean of the population is represented by the symbol _, and the mean of the sample is represented by the symbol _.

If you knew nothing about your data except that it is a scale variable, which measure of central tendency would be the "safest bet"?

The mean is the measure of central tendency that conveys the middle score of the data.

The _____ is a measure of variability that is calculated by taking the difference of the highest and lowest scores in the distribution.

A researcher analyzed the results of her data and calculated the standard deviation of scores at 6.7.What is the variance?

The numerical summary characteristics of a population are called _, while the numerical summary characteristics of a sample are called _.

The median is preferred over the mean for _____ distributions.

A bimodal distribution has _____ mode(s).

The median is preferred over the mean for skewed distributions.

When data are based on a nominal scale of measurement, what measure of central tendency should be used?

In a physical geography course, the average score on the first exam across all sections of the course was 77.63 percent.Because all students were included in the calculation, the mean is assumed to be based on population data.The test average may be considered to be a:

If an extreme score is added to a data set, increasing the range of data, the standard deviation will:

In a sample of data that has several extremely high scores, creating positive skew, the mean will be _____ the median.

The variance calculated on 22 scores is equal to 28.93.What is the standard deviation?

What measure of variability is the square root of the average of the squared deviations from the mean?

Katrina observes and records the number of people who purchase a meal at the school cafeteria during each operating hour.The cafeteria is open from 6:00 a.m.to 9:00 p.m.and students typically eat breakfast, lunch, and dinner.What type of distribution should Katrina expect to see in her data?

The concept of central tendency is best described as:

The interquartile range measures variability as the difference between the scores at the 75th and 25th percentiles.

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Sampling and Probability

The Normal Curve, Standardization and Z Scores

Hypothesis Testing With Z Tests

Confidence Intervals, Effect Size, and Statistical Power

The Single-Sample T Test

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

Exam 4: Central Tendency and Variability

The standard deviation is equal to the square root of the variance.

If the standard deviation of some data is 0.347, what is the variance?

The mean of the population is represented by the symbol _____, and the mean of the sample is represented by the symbol _____.

If you knew nothing about your data except that it is a scale variable, which measure of central tendency would be the "safest bet"?

The mean is the measure of central tendency that conveys the middle score of the data.

The _____ is a measure of variability that is calculated by taking the difference of the highest and lowest scores in the distribution.

A researcher analyzed the results of her data and calculated the standard deviation of scores at 6.7.What is the variance?

The numerical summary characteristics of a population are called _____, while the numerical summary characteristics of a sample are called _____.

The median is preferred over the mean for _____ distributions.

A bimodal distribution has _____ mode(s).

The median is preferred over the mean for skewed distributions.

When data are based on a nominal scale of measurement, what measure of central tendency should be used?

In a physical geography course, the average score on the first exam across all sections of the course was 77.63 percent.Because all students were included in the calculation, the mean is assumed to be based on population data.The test average may be considered to be a:

If an extreme score is added to a data set, increasing the range of data, the standard deviation will:

In a sample of data that has several extremely high scores, creating positive skew, the mean will be _____ the median.

The variance calculated on 22 scores is equal to 28.93.What is the standard deviation?

What measure of variability is the square root of the average of the squared deviations from the mean?

Katrina observes and records the number of people who purchase a meal at the school cafeteria during each operating hour.The cafeteria is open from 6:00 a.m.to 9:00 p.m.and students typically eat breakfast, lunch, and dinner.What type of distribution should Katrina expect to see in her data?

The concept of central tendency is best described as:

The interquartile range measures variability as the difference between the scores at the 75th and 25th percentiles.

An Introduction to Statistics and Research Design

Frequency Distributions

Visual Displays of Data

Sampling and Probability

The Normal Curve, Standardization and Z Scores

Hypothesis Testing With Z Tests

Confidence Intervals, Effect Size, and Statistical Power

The Single-Sample T Test

The Paired-Samples T Test

The Independent-Samples T Test

One-Way Between-Groups Anova

One-Way Within-Groups Anova

Two-Way Between-Groups Anova

Correlation

Regression

Chi-Square Tess

Choosing and Reporting Statistics

Filters

The mean of the population is represented by the symbol _, and the mean of the sample is represented by the symbol _.

The numerical summary characteristics of a population are called _, while the numerical summary characteristics of a sample are called _.