Chi-Square Test – Statistic Final Exam

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Chi-Square Test, Goodness of Fit, Grade Point Average, Correlation – Final Exam

The key terms in these Statistic chapters include Chi-Square Test, Goodness of Fit, Grade Point Average, Sample, Two Tailed Test, Frequencies, Population, ANOVA, Standard Deviation, Null Hypothesis, Correlation, Survey, Repeated-Measures Research Study, Summation Notation. Final Exam is based on these chapters.


The chi-square test for goodness of fit evaluates

the shape or proportions for a population distribution


A large value for the chi-square statistic indicates

the sample data (observed values) do not fit the null hypothesis


The term expected frequencies refers to

the frequencies computed from the null hypothesis


The term observed frequency refers to

the frequencies found in the sample data


For a linear regression equation, the standard error of estimate is computed using df =

n – 2


A researcher classifies college students as either high or low IQ, then measures each student’s grade point average. For the resulting data, which correlation should be used to measure the relationship between IQ and grade point average?

point-biserial correlation


For a sample of n = 25 individuals, how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with a = .05?

0.374


A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surveys that were completed and returned, the researcher finds that these students spend an average of 4.1 hours each week working on course material outside of class. For this study, the set of 56 students who returned surveys is an example of a(n)

sample


A researcher is interested in the eating behavior of rats and selects a group of 25 rats to be tested in a research study. The group of 25 rats is an example of a ______.

sample


A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surveys that were completed and returned, the researcher finds that these students spend an average of 4.1 hours each week working on course material outside of class. For this study, the average of 4.1 hours is an example of a(n) _______.

Statistic

A college professor reports that students who finish exams early tend to get better grades than students who hold on to exams until the last possible moment. The correlation between exam score and amount of time spent on the exam is an example of ____.

a negative correlation


A two factor analysis of variance produces SS A = 20, SS B = 40 and SS AxB = 90. For this analysis, what is the value for SS between treatments?

150

In a line graph showing the results from a two-factor experiment, the levels of factor B are presented on the X-axis and the line for A1 is consistently 5 points higher than the line for A2. What result is indicated by this pattern?

an indication of an A-effect and an indication of no interaction


In a two-factor ANOVA, which of the following is not computed directly but rather is found by subtraction?

SSAxB


A repeated-measures research study uses n = 6 subjects. If the within-treatment df for the ANOVA is 15, what is the value for dferror?

10

A repeated-measures study uses a sample of n = 5 individuals to evaluate the mean differences among three treatments. The ANOVA for this study has

df within treatments = 12 and df between subjects = 4


The chi-square test for goodness of fit evaluates

the shape or proportions for a population distribution


A large value for the chi-square statistic indicates

the sample data (observed values) do not fit the null hypothesis


The term expected frequencies refers to

the frequencies computed from the null hypothesis


The term observed frequency refers to

the frequencies found in the sample data


For a linear regression equation, the standard error of estimate is computed using df =

n – 2


A researcher classifies college students as either high or low IQ, then measures each student’s grade point average. For the resulting data, which correlation should be used to measure the relationship between IQ and grade point average?

point-biserial correlation


The purpose for post tests is

to determine which treatments are significantly different


What is the final step to be performed when computing Σ(X – 2)^2?

sum the squared values


You are instructed to subtract four points from each score and find the sum of the resulting values. How would this set of instructions be expressed in summation notation?

Σ(X – 4)

You are instructed to subtract four points from each score, square the resulting value, and find the sum of the squared numbers. How would this set of instructions be expressed in summation notation?

Σ(X – 4)^2

A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surveys that were completed and returned, the researcher finds that these students spend an average of 4.1 hours each week working on course material outside of class. For this study, the set of 56 students who returned surveys is an example of a(n)

sample


A researcher is interested in the eating behavior of rats and selects a group of 25 rats to be tested in a research study. The group of 25 rats is an example of a ______.

Sample

A researcher uses an anonymous survey to investigate the study habits of American college students. Based on the set of 56 surveys that were completed and returned, the researcher finds that these students spend an average of 4.1 hours each week working on course material outside of class. For this study, the average of 4.1 hours is an example of a(n) _______.

statistic


A researcher is curious about the average monthly cell phone bill for high school students in the state of Florida. If this average could be obtained, it would be an example of a ______.

parameter


After measuring two individuals, a researcher can say that Tom’s score is 4 points higher than Bill’s. The measurements must come from a(n) _______ scale.

interval or ratio


What is the first step to be performed in the following mathematical expression? (ΣX)^2

Add the scores

What is the final step to be performed in the following mathematical expression? (ΣX)^2?

Square the sum of the scores


The chi-square test for goodness of fit evaluates

the shape or proportions for a population distribution


A large value for the chi-square statistic indicates

the sample data (observed values) do not fit the null hypothesis


The term expected frequencies refers to

the frequencies computed from the null hypothesis


The term observed frequency refers to

the frequencies found in the sample data


For a linear regression equation, the standard error of estimate is computed using df =

n – 2


A researcher classifies college students as either high or low IQ, then measures each student’s grade point average. For the resulting data, which correlation should be used to measure the relationship between IQ and grade point average?

point-biserial correlation


The term observed frequency refers to

the frequencies found in the sample data


For a linear regression equation, the standard error of estimate is computed using df =

n – 2


A researcher classifies college students as either high or low IQ, then measures each student’s grade point average. For the resulting data, which correlation should be used to measure the relationship between IQ and grade point average?

point-biserial correlation


The purpose for post tests is

to determine which treatments are significantly different


What is the final step to be performed when computing Σ(X – 2)^2?

sum the squared values


You are instructed to subtract four points from each score and find the sum of the resulting values. How would this set of instructions be expressed in summation notation?

Σ(X – 4)

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