HCD 300 Participation and Homework 9
Exam UPDATED QUESTIONS AND
CORRECT ANSWERS
What is the criteria for a two-sample t-test?
- Sample size over 30, population standard deviation is known
- Population standard deviation unknown, sample size over 30
- Sample size under 30, population standard deviation is unknown - CORRECT
ANSWER Sample size under 30, population standard deviation is unknown
What is the assumption for equal variance? OR How do you determine equal or unequal variance?
- Calculate the ratio of the sample variances. The ratio should be between 0.5 and 2.
- Calculate the ratio of the sample variances. The ratio should be between between 1 and 3.
- The sample sizes have nothing to do with the variance.
- Calculate the ratio of the sample variances. The ratio should be between between 5 and 10. -
CORRECT ANSWER Calculate the ratio of the sample variances. The ratio should be between
0.5 and 2.
Two departments are competing in a walking challenge. The average minutes walked each day by the
members of each department are listed below. Determine equal or unequal variances?
Group 1: 17, 22, 5, 15, 12, 20, 14, 15, 20, 21
Group 2: 6, 9, 12, 11, 11, 8, 13, 14, 7
- Unequal
- There is not enough information provided to determine the variances.
- Equal - CORRECT ANSWER Unequal
Which of the following is a limitation to two-sample t-tests with independent samples?
, - You can only evaluate two sample t-test with equal variances
- You can only evaluate the means
- You cannot evaluate anything - CORRECT ANSWER You can only evaluate the means
What is the effect size of a Cohen's d value of 0.50?
- small
- large
- medium - CORRECT ANSWER medium
What is the criteria for a two-sample t-test with dependent samples?
- The sample sizes should be unequal
- Sample size should be equal
- The ratio of the variances of each group should be less than 3 - CORRECT ANSWER Sample
size should be equal
What is the correct formula for the degrees of freedom for a two-sample t-test with dependent
samples?
-n+2
- n - 1 (where n is the number of total observations)
- n-1 (where n is the number of pairs
- (n1-1) + (n2-1) - CORRECT ANSWER n-1 (where n is the number of pairs)
What type of test would be used to evaluate the performance of 10 individuals in a spelling bee if they
were observed before AND after they took a course to improve their spelling?
- A two-sample t-test with independent samples
- A z-test
Exam UPDATED QUESTIONS AND
CORRECT ANSWERS
What is the criteria for a two-sample t-test?
- Sample size over 30, population standard deviation is known
- Population standard deviation unknown, sample size over 30
- Sample size under 30, population standard deviation is unknown - CORRECT
ANSWER Sample size under 30, population standard deviation is unknown
What is the assumption for equal variance? OR How do you determine equal or unequal variance?
- Calculate the ratio of the sample variances. The ratio should be between 0.5 and 2.
- Calculate the ratio of the sample variances. The ratio should be between between 1 and 3.
- The sample sizes have nothing to do with the variance.
- Calculate the ratio of the sample variances. The ratio should be between between 5 and 10. -
CORRECT ANSWER Calculate the ratio of the sample variances. The ratio should be between
0.5 and 2.
Two departments are competing in a walking challenge. The average minutes walked each day by the
members of each department are listed below. Determine equal or unequal variances?
Group 1: 17, 22, 5, 15, 12, 20, 14, 15, 20, 21
Group 2: 6, 9, 12, 11, 11, 8, 13, 14, 7
- Unequal
- There is not enough information provided to determine the variances.
- Equal - CORRECT ANSWER Unequal
Which of the following is a limitation to two-sample t-tests with independent samples?
, - You can only evaluate two sample t-test with equal variances
- You can only evaluate the means
- You cannot evaluate anything - CORRECT ANSWER You can only evaluate the means
What is the effect size of a Cohen's d value of 0.50?
- small
- large
- medium - CORRECT ANSWER medium
What is the criteria for a two-sample t-test with dependent samples?
- The sample sizes should be unequal
- Sample size should be equal
- The ratio of the variances of each group should be less than 3 - CORRECT ANSWER Sample
size should be equal
What is the correct formula for the degrees of freedom for a two-sample t-test with dependent
samples?
-n+2
- n - 1 (where n is the number of total observations)
- n-1 (where n is the number of pairs
- (n1-1) + (n2-1) - CORRECT ANSWER n-1 (where n is the number of pairs)
What type of test would be used to evaluate the performance of 10 individuals in a spelling bee if they
were observed before AND after they took a course to improve their spelling?
- A two-sample t-test with independent samples
- A z-test
