Question 1

Descriptive statistics are more precise when the sample is larger. This is predicted by the

Accepted Answer

A)  standard error. 
B)  central tendency measures. 
C)  normal distribution. 
D)  central limit theorem. 
A)  standard error. 
B)  central tendency measures. 
C)  normal distribution. 
D)  central limit theorem.

Question 2

The process of deleting responses on both ends of the distribution of a variable is known as

Accepted Answer

A)  outlier deletion. 
B)  transforming the data. 
C)  trimming the data. 
D)  cleaning the data. 
A)  outlier deletion. 
B)  transforming the data. 
C)  trimming the data. 
D)  cleaning the data.

Question 3

If the lower limit of a confidence interval is 1.5 and the upper limit of a confidence interval is 5.5, we can state that

Accepted Answer

A)  a score of 6 is impossible. 
B)  95 percent of the scores should fall between 1.5 and 5.5. 
C)  the confidence level is extremely small. 
D)  the distribution is normal. 
A)  a score of 6 is impossible. 
B)  95 percent of the scores should fall between 1.5 and 5.5. 
C)  the confidence level is extremely small. 
D)  the distribution is normal.

Question 4

The frequency of nominal data can be graphically presented using a

Accepted Answer

A)  bar chart. 
B)  histogram. 
C)  polygon. 
D)  bell-shaped curve. 
A)  bar chart. 
B)  histogram. 
C)  polygon. 
D)  bell-shaped curve.

Question 5

What is the measure of central tendency which represents the most frequently occurring value in a variable?

Accepted Answer

A)  Mean 
B)  Median 
C)  Mode 
D)  Media 
A)  Mean 
B)  Median 
C)  Mode 
D)  Media

Question 6

A quick way to check the data once it has been entered is to

Accepted Answer

A)  compare all of the data with the original questionnaires. 
B)  wait until a statistical analysis is completed before checking the data. 
C)  conduct a frequency distribution. 
D)  conduct a chi-square analysis. 
A)  compare all of the data with the original questionnaires. 
B)  wait until a statistical analysis is completed before checking the data. 
C)  conduct a frequency distribution. 
D)  conduct a chi-square analysis.

Question 7

Assume that a random sample of twenty-three students at your university were found to have a mean GPA of 2.8 with a standard deviation of .8. What would be the best guess of the average GPA of the entire university?

Accepted Answer

A)  2.8 
B)  3.6 
C)  2.0 
D)  3.0 
A)  2.8 
B)  3.6 
C)  2.0 
D)  3.0

Question 8

A researcher might delete a variable before analyzing the data when

Accepted Answer

A)  the variable shows the expected relationship with the independent variable, but another variable does not. 
B)  the statistical analysis reveals that the variable did not have a significant impact on the independent variable. 
C)  a reliability analysis indicates that the variable does not measure the same thing that other variables, designed to measure the same conceptual variable, do. 
D)  the relationship of the variable to the independent variable is not in the predicted direction. 
A)  the variable shows the expected relationship with the independent variable, but another variable does not. 
B)  the statistical analysis reveals that the variable did not have a significant impact on the independent variable. 
C)  a reliability analysis indicates that the variable does not measure the same thing that other variables, designed to measure the same conceptual variable, do. 
D)  the relationship of the variable to the independent variable is not in the predicted direction.

Question 9

A z score represents

Accepted Answer

A)  the mean score in a sampling distribution. 
B)  the distance of a score from the median. 
C)  the distance of a score from the mean of the variable in standard deviation units. 
D)  the distance of the mean minus the standard deviation. 
A)  the mean score in a sampling distribution. 
B)  the distance of a score from the median. 
C)  the distance of a score from the mean of the variable in standard deviation units. 
D)  the distance of the mean minus the standard deviation.

Question 10

The statement that "Japanese children are more intelligent than American children" is an example of the use of

Accepted Answer

A)  inferential statistics. 
B)  descriptive statistics. 
C)  standard deviations. 
D)  frequency distributions. 
A)  inferential statistics. 
B)  descriptive statistics. 
C)  standard deviations. 
D)  frequency distributions.

Question 11

Which measure of central tendency would probably be the most appropriate for analyzing the ratings (on a 1 to 7 scale) of a professor's teaching skills?

Accepted Answer

A)  Mean 
B)  Mode 
C)  Median 
D)  Meridian 
A)  Mean 
B)  Mode 
C)  Median 
D)  Meridian

Question 12

The mean of the standard scores of a variable is always equal to _________ and the standard deviation is always equal to ________.

Accepted Answer

A)  0; 1 
B)  1; 1 
C)  1; 0 
D)  0; 0 
A)  0; 1 
B)  1; 1 
C)  1; 0 
D)  0; 0

Question 13

The range is equal to the

Accepted Answer

A)  mean minus the mode. 
B)  maximum score minus the mean. 
C)  mean minus the median. 
D)  maximum score minus the minimum score. 
A)  mean minus the mode. 
B)  maximum score minus the mean. 
C)  mean minus the median. 
D)  maximum score minus the minimum score.

Question 14

For which of the following reasons would data be deleted before the data are analyzed?

Accepted Answer

A)  If the data contain outliers 
B)  If there are too many participants for analysis 
C)  If the participants' answers seem too low 
D)  When some of the responses do not support the research hypothesis 
A)  If the data contain outliers 
B)  If there are too many participants for analysis 
C)  If the participants' answers seem too low 
D)  When some of the responses do not support the research hypothesis

Question 15

According to the _________, descriptive statistics calculated on large samples provide more precise estimates of population parameters than do these same statistics calculated on small samples.

Accepted Answer

A)  central limit theorem 
B)  confidence intervals 
C)  unbiased estimator of the population mean 
D)  sample standard deviation 
A)  central limit theorem 
B)  confidence intervals 
C)  unbiased estimator of the population mean 
D)  sample standard deviation

Question 16

The exact width of the confidence interval is determined by using which of the following statistics?

Accepted Answer

A)  Z score 
B)  Median 
C)  P-value 
D)  Student's t 
A)  Z score 
B)  Median 
C)  P-value 
D)  Student's t

Question 17

A professor tells his students the results of the first exam: six students received an A, twelve students received a B, fifteen students received a C, and three students received an F. In statistical terms, this information is a

Accepted Answer

A)  measure of variability. 
B)  measure of central tendency. 
C)  measure of standard deviation. 
D)  frequency distribution. 
A)  measure of variability. 
B)  measure of central tendency. 
C)  measure of standard deviation. 
D)  frequency distribution.

Question 18

A grouped frequency distribution is graphically represented using a

Accepted Answer

A)  bar chart. 
B)  histogram. 
C)  polygon. 
D)  bell-shaped curve. 
A)  bar chart. 
B)  histogram. 
C)  polygon. 
D)  bell-shaped curve.

Descriptive statistics are more precise when the sample is larger. This is predicted by the

The process of deleting responses on both ends of the distribution of a variable is known as

If the lower limit of a confidence interval is 1.5 and the upper limit of a confidence interval is 5.5, we can state that

The frequency of nominal data can be graphically presented using a

What is the measure of central tendency which represents the most frequently occurring value in a variable?

A quick way to check the data once it has been entered is to

Assume that a random sample of twenty-three students at your university were found to have a mean GPA of 2.8 with a standard deviation of .8. What would be the best guess of the average GPA of the entire university?

A researcher might delete a variable before analyzing the data when

A z score represents

The statement that "Japanese children are more intelligent than American children" is an example of the use of

Which measure of central tendency would probably be the most appropriate for analyzing the ratings (on a 1 to 7 scale) of a professor's teaching skills?

The mean of the standard scores of a variable is always equal to _ and the standard deviation is always equal to .

The range is equal to the

For which of the following reasons would data be deleted before the data are analyzed?

According to the _________, descriptive statistics calculated on large samples provide more precise estimates of population parameters than do these same statistics calculated on small samples.

The exact width of the confidence interval is determined by using which of the following statistics?

A professor tells his students the results of the first exam: six students received an A, twelve students received a B, fifteen students received a C, and three students received an F. In statistical terms, this information is a

A grouped frequency distribution is graphically represented using a

Introduction to Research

Developing the Research Hypothesis

Ethics in Research

Measures

Reliability and Validity

Surveys and Sampling

Naturalistic Methods

Hypothesis Testing and Inferential Statistics

Correlational Research Designs

Experimental Research: One-Way Designs

Experimental Research: Factorial Designs

Experimental Control and Internal Validity

External Validity

Quasi-Experimental Research Designs

Reporting Research Results

Bivariate Statistics

Multivariate Statistics

Filters

Exam 16: Data Preparation and Univariate Statistics

Descriptive statistics are more precise when the sample is larger. This is predicted by the

The process of deleting responses on both ends of the distribution of a variable is known as

If the lower limit of a confidence interval is 1.5 and the upper limit of a confidence interval is 5.5, we can state that

The frequency of nominal data can be graphically presented using a

What is the measure of central tendency which represents the most frequently occurring value in a variable?

A quick way to check the data once it has been entered is to

Assume that a random sample of twenty-three students at your university were found to have a mean GPA of 2.8 with a standard deviation of .8. What would be the best guess of the average GPA of the entire university?

A researcher might delete a variable before analyzing the data when

A z score represents

The statement that "Japanese children are more intelligent than American children" is an example of the use of

Which measure of central tendency would probably be the most appropriate for analyzing the ratings (on a 1 to 7 scale) of a professor's teaching skills?

The mean of the standard scores of a variable is always equal to _________ and the standard deviation is always equal to ________.

The range is equal to the

For which of the following reasons would data be deleted before the data are analyzed?

According to the _________, descriptive statistics calculated on large samples provide more precise estimates of population parameters than do these same statistics calculated on small samples.

The exact width of the confidence interval is determined by using which of the following statistics?

A professor tells his students the results of the first exam: six students received an A, twelve students received a B, fifteen students received a C, and three students received an F. In statistical terms, this information is a

A grouped frequency distribution is graphically represented using a

Introduction to Research

Developing the Research Hypothesis

Ethics in Research

Measures

Reliability and Validity

Surveys and Sampling

Naturalistic Methods

Hypothesis Testing and Inferential Statistics

Correlational Research Designs

Experimental Research: One-Way Designs

Experimental Research: Factorial Designs

Experimental Control and Internal Validity

External Validity

Quasi-Experimental Research Designs

Reporting Research Results

Bivariate Statistics

Multivariate Statistics

Filters

The mean of the standard scores of a variable is always equal to _ and the standard deviation is always equal to .