PSYCHOLOGY 355 quiz 8

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PSYCHOLOGY 355 quiz 8

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PSYC 355 quiz 8The document "202140_Fall_2021_PSYC_355_quiz_" is a multiple-choice quiz on Chi-Square Tests and an associated article for a psychology course (PSYC 355). Here’s a brief summary of key topics covered: Topics and Concepts: Null Hypothesis in Chi-Square Tests Specifies population proportions. Chi-Square for Independence Each participant is counted once. Degrees of freedom (df) indicate the number of categories used (e.g., df = 2 → 3 categories). A test with df = 1 means both variables have 2 categories each. Chi-Square Goodness of Fit Test Evaluates preference distribution among groups (e.g., brands of TVs). Null hypothesis assumes equal preference (e.g., 1/3 each for 3 categories). Observed vs Expected Frequencies Observed frequencies are actual data counts. Expected frequencies are theoretical values based on the null hypothesis. Chi-Square Statistic Properties Always positive; can include fractions or decimals. Larger values indicate greater discrepancies from expected frequencies. Effect Size Measures Phi-coefficient used only when df = 1 (not when df 1). Test Differences Goodness of fit = one variable. Test for independence = relationship between two variables. Critical Values and Degrees of Freedom As df increases, the critical value for significance also increases.

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PSYC 355 quiz 8
202140 Fall 2021 PSYC
355- B08 LUO
Quiz: Chi-Square Tests and Module 8 Article
• Question 1
2 out of 2
What values are specified by the null hypothesis for a chi-square test? points

Selecte
b.
d
Answer Proportions for a population
:

• Question
2 2 out of 2
points
In the observed frequencies for a chi-square test for independence, how often is each
participant counted?
Selecte
d d.
Answer Just once
:

• Question
3 2 out of 2
points
A sample of n = 100 people is classified into four categories. If the results are evaluated
with a chi-square test for goodness of fit, what is the df value for the chi-square statistic?
b.

• Answer:Question
4 2 out of 2
points
A researcher is using a chi-square test to determine whether people have any preferences
among three brands of televisions. The null hypothesis for this test would state that .
Selecte
d d.
Answer one-third of the population prefers each brand
:

• Question
5 0 out of 2
points
Which of the following accurately describes the observed frequencies for a chi-square test?

This study source was downloaded by 100000893642068 from CourseHero.com on 05-25-2025 15:25:00 GMT -05:00

https://www.coursehero.com/file/229012263/202140-Fall-2021-PSYC-355-quiz-8docx/

, Selecte c.
d
Answer They can contain fractions or decimal values.
:

• Question
6 2 out of 2
points
What values are specified by the null hypothesis for the chi-square test for goodness of fit?
Selecte
d a.
Answer Proportions for the entire population
:

• Question
7 2 out of 2
points
A chi-square test for goodness of fit has df = 2. How many categories were used to classify
the individuals in the sample?
Selected d.
Answer: 3
• Question 8
2 out of 2 points
A chi-square test for independence is being used to evaluate the relationship between two
variables. If the test has df = 1, what can you conclude about the two variables?
Selecte
d d.
Answer Both variables consist of 2 categories.
:

• Question 9

Which of the following best describes the possible values for a chi-square 2 out of 2
statistic? points

Selecte
d
Answer b.
: Chi-square is always positive but can contain fractions or decimal values.

• Question
10
0 out of 2
points
The phi-coefficient is used to evaluate effect size for the chi-square test for independence,
provided the test has df > 1.
Selecte Tr
d u
Answer e
:
This study source was downloaded by 100000893642068 from CourseHero.com on 05-25-2025 15:25:00 GMT -05:00

https://www.coursehero.com/file/229012263/202140-Fall-2021-PSYC-355-quiz-8docx/

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Uploaded on: May 25, 2025
Number of pages: 5
Written in: 2024/2025
Type: Exam (elaborations)
Contains: Questions & answers

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