Question

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

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

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....

An educational psychologist studies the effect of frequent
testing on retention of class material. In one of the professor's
sections, students are given quizzes each week. The second section
receives only two tests during the semester. At the end of the
semester, both sections receive the same final exam, and the scores
are summarized below.
Frequent Quizzes
Two Exams
n = 15
n = 15
M = 72
M = 68
If the first sample variance is s^2=32 and the...

An educational psychologist studies the effect of frequent
testing on retention of course material. In one of the professor's
sections, students are given quizzes each week. The second section
receives only two tests during the semester. At the end of the
semester, both sections receive the same final exam, and the scores
are summarized below: Frequent quizzes: n = 15, M = 72, SS = 100
Two exams: n = 15, M = 68, SS = 110 Do the data...

An educational psychologist studies the effect of frequent
testing on retention of class material. In one of the professor's
sections, students are given quizzes each week. The second section
receives only two tests during the semester. At the end of the
semester, both sections receive the same final exam, and the scores
are summarized below.
a.
Do the data indicate that testing frequency has a significant
effect on performance? Use a two-tailed test with α = .01. Include
the null...

1) The following data for subcutaneous oxygen tension (PSCO2,
measured in mmHg) 12 hours after the start of two protocols,
administered to the same 10 healthy subjects in random order- a bed
rest protocol and a high activity protocol. Please choose the
statistical test that is most appropriate for this research.
a) Repeated Measures t-test
b) Independent Samples t-test
c) Pearson r Correlation Coefficient
d) One Sample z-test
2) A researcher is testing the effect of a new cold and...

__________ A researcher hypothesized that the score from the GRE
test is positively associated with the final-statistics course
grade. The data was collected from 80 new nursing students on their
GRE score and final-statistics grade.
Research question: Is there any relationship/association between
the GRE score and final-exam score in statistics course among
nursing students? Please indicate which statistical test
should be used below.
a. Independent t-test
b. Dependent t-test
c. One-way ANOVA
d. Two-way ANOVA
e. RM-ANOVA
f. Pearson’s Correlation...

Discussion Question: In this research study, one group was asked
to watch a car accident and were asked to estimate the speed of the
car after it "hit" the other car, while a different group also
watched an accident but instead were asked to estimate the speed
after the cars "collided." Explain why an independent
samples t-test was used, and give an example of a
research study in which an independent samples t-test would be the
appropriate statistical analysis.

To examine the effect of caffeine and age on physical endurance,
a researcher randomly selects a sample of n = 60 NSC students. He
divides the sample based on age (18 – 30, 31 – 50, and 50 +). Half
of the 18 – 30 group, half of the 31 – 50 group, and half of the 50
+ group consumes a heavily caffeinated drink and the rest of the
participants consume a non-caffeinated drink. Ten minutes after
consuming the...

QUESTION 25
Suppose we expand the study described in Question #24. Instead
of looking only at juniors and seniors, we also take random samples
of freshmen and sophomores. Which inferential statistical test
would we use to determine whether there is a statistically
significant effect of year-in-college on exam scores?
independent-samples t test/two-sample t test
dependent-samples t test / matched-pairs t
test / related-samples t test / paired t test
chi-square
one-way ANOVA
factorial ANOVA

QUESTION 27
Suppose we want to know whether students feel more stressed at
the beginning of the semester or at the end of the semester. We
take a random sample of students. Midway through the first week of
classes, we ask the students to rate their current stress level on
a scale from 0 (completely relaxed) to 100 (completely stressed
out). Midway through the last week of classes, we ask the same
students to rate their current stress level using...

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