HCD 300 PARTICIPATION AND HOMEWORK 9 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS (GRADED A+)

HCD 300 PARTICIPATION AND
HOMEWORK 9 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS (GRADED A+)
Criteria for a Two-Sample T-Test
What is the criterion for performing 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
 Answer: Sample size under 30, population standard deviation is unknown


Assumption for Equal Variance
What is the assumption for equal variance, or how do you determine whether the
variances are equal or unequal?
 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 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 5
and 10.
 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 -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 -ANSWER✔✔You can only evaluate the means


What is the effect size of a Cohen's d value of 0.50?


- small
- large
- medium -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