Question 1

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 2

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 3

If A = 5, B = 4 and C = 2, then Σ (A, B, C) =

Accepted Answer

A) 5 
B) -1 
C) 40 
D) 11 
A) 5 
B) -1 
C) 40 
D) 11

Question 4

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 5

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 6

Descriptive statistics represent the data from a ________ whereas parameters represent the data from a __________.

Accepted Answer

A) sample; population 
B) population; sample 
C) normal distribution; control group 
D) binomial distribution; population 
A) sample; population 
B) population; sample 
C) normal distribution; control group 
D) binomial distribution; population

Question 7

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 8

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 9

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 10

Which of the following represents the mode of the following eight numbers: 1 2 2 4 5 5 5 8

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
A) 2 
B) 3 
C) 4 
D) 5

Question 11

Which of the following is NOT a descriptive statistic?

Accepted Answer

A) The mean 
B) The standard deviation 
C) The p-value 
D) The standard score 
A) The mean 
B) The standard deviation 
C) The p-value 
D) The standard score

Question 12

Which of the following measures central tendency?

Accepted Answer

A) Mode 
B) Standard deviation 
C) Sum of squares 
D) Variance 
A) Mode 
B) Standard deviation 
C) Sum of squares 
D) Variance

Question 13

Which of the following measures dispersion?

Accepted Answer

A) Mean 
B) Percentile rank 
C) Sum of squares 
D) Mode 
A) Mean 
B) Percentile rank 
C) Sum of squares 
D) Mode

Question 14

A researcher measures all of the students in her class, and determines that the mean of their IQ scores is 105.This information is a(n)

Accepted Answer

A) inferential statistic. 
B) descriptive statistic. 
C) analyzing statistic. 
D) control variable. 
A) inferential statistic. 
B) descriptive statistic. 
C) analyzing statistic. 
D) control variable.

Question 15

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 16

Imagine the distribution of salaries in a large corporation.Which of the following statistics is likely to be the largest?

Accepted Answer

A) The median 
B) The mean 
C) The mode 
D) The minimum 
A) The median 
B) The mean 
C) The mode 
D) The minimum

Question 17

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 18

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

A researcher might delete a variable before analyzing the data when

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

If A = 5, B = 4 and C = 2, then Σ (A, B, C) =

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

Descriptive statistics represent the data from a whereas parameters represent the data from a __.

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

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

Which of the following represents the mode of the following eight numbers: 1 2 2 4 5 5 5 8

Which of the following is NOT a descriptive statistic?

Which of the following measures central tendency?

Which of the following measures dispersion?

A researcher measures all of the students in her class, and determines that the mean of their IQ scores is 105.This information is a(n)

The frequency of nominal data can be graphically presented using a

Imagine the distribution of salaries in a large corporation.Which of the following statistics is likely to be the largest?

A z score represents

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

Introduction to Research and Research Designs

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

A researcher might delete a variable before analyzing the data when

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

If A = 5, B = 4 and C = 2, then Σ (A, B, C) =

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

Descriptive statistics represent the data from a ________ whereas parameters represent the data from a __________.

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

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

Which of the following represents the mode of the following eight numbers: 1 2 2 4 5 5 5 8

Which of the following is NOT a descriptive statistic?

Which of the following measures central tendency?

Which of the following measures dispersion?

A researcher measures all of the students in her class, and determines that the mean of their IQ scores is 105.This information is a(n)

The frequency of nominal data can be graphically presented using a

Imagine the distribution of salaries in a large corporation.Which of the following statistics is likely to be the largest?

A z score represents

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

Introduction to Research and Research Designs

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

Descriptive statistics represent the data from a whereas parameters represent the data from a __.

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