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# Question 7 An educational psychologist studies the effect of frequent testing on retention of class material....

Question 7

An educational psychologist studies the effect of frequent testing on retention of class material. The students are randomly assigned to one of two sections of an introductory course. In one section of an introductory course, students are given quizzes each week. A second section of the same course receives only two tests during the semester. At the end of the semester, both sections receive the same final exam. Please choose the statistical test that is most appropriate for this research.

Group of answer choices

Repeated Measures t-test

Two-way ANOVA

Pearson r Correlation Coefficient

Independent Samples t-test

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Question 8

A researcher would like to determine whether a new tax on cigarettes has had any effect on people’s behavior. During the previous three years before the tax was imposed, stores located in rest areas on the state thruway reported selling an average 410 packs per day with a standard deviation of 60. The distribution of daily sales was approximately normal. For thirty days following the new tax, the researcher found an average of 386 packs per day with a standard deviation of 48 for the same stores. Please choose the statistical test that is most appropriate for this research.

Group of answer choices

Independent Samples t-test

One-way ANOVA

One Sample t-test

One Sample z-test

Question 9

Suppose we wanted to compare the somatic complaints (as measured on a scale known as the Physical Symptom Survey or PSS) of three groups of people: nonsmokers, smokers, and people who recently quit smoking. Please choose the statistical test that is most appropriate for this research.

Group of answer choices

Independent Samples t-test

Repeated Measures t-test

One-way ANOVA

One Sample t-test

#### Homework Answers

Answer #1

7:

Here we need to mean score of two independent populations so independent sample t test must be used.

Correct option is

Independent Samples t-test

8:

Here we need to make inference whether a new tax on cigarettes has had any effect on people’s behavior. That is we need to make inference about single population. Population standard deviation is known. So correct option is

One Sample z-test

9:

Here we need to more than two groups so one way ANOVA will be used. Correct option is

One-way ANOVA

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