20. Hypothesis Tests: Categories

Question 1

What type of test would you use: Comparing the percentage of SGU students from different countries who have a Netflix subscription? (MG)

A. Chi-squared
B. T-test
C. ANOVA

Answer 1

A. Chi-squared

Comparing categorical data. Percentage is a keyword for chi-squared

Question 2

What type of test would you use: comparing the mean number of hours spent watching Netflix among SGU students from the 4 most-enrolled countries? (MG)

A. Chi-squared
B. T-test
C. ANOVA

Answer 2

C. ANOVA

continuous data comparing means, but more than 2 groups.

Question 3

A two sample T-test is graphed examining the mean cholesterol levels in individuals with a normal BMI and individuals with a BMI>30. The graphs do not have any overlap and the groups are far apart. This type of graph signifies which of the following?

A. Rejected Null
B. Failed to reject the null
C. Null is correct
D. None of the above

SZ

Answer 3

Ans. A Reject the null

If the graphs are many standard deviations apart it signifies that the means are probably very different, rejected the null.

Question 4

Which of the following is incorrect regarding Chi-squared tests?

A. Compare frequencies of categorical data
B. Data outcome is continuous
C. Null hypothesis is a predictor likely to fall into any categorical outcome
D. Testing only has one tail
E. Each category has an expected value of at least 5

SZ

Answer 4

Ans B. Data is not continuous but it is nominal.

The remaining answer choices are true