T-Test_Fall2023

Which t-test should be used when comparing the means of two unrelated groups?

• one-sample t-test
• indepentent sample t-test
• paired sample t-test

When should a one-sample t-test be used?

• Comparing the mean of a single group to a known population
• comparing two unrelated groups
• Comparing two related groups

If you want to compare the scores of students before and after a teaching intervention, which t-test would you use?

• one sample t-test
• paired sample t-test
• independent sample t test

  What is the critical value for a one-tailed t-test at a 0.05 significance level with 20 degrees of freedom?

• 2.086
• 2.093
• 1.725

  If you are performing a two-tailed t-test with 15 degrees of freedom at a 0.05 significance level, what is the critical value?

• 2.145
• 2.131
• 2.947

When looking up a critical value for a t-distribution, what information do you need?

• The test statistic and the significance level
• the standard deviation and the mean
• The degrees of freedom and the significance level

How is the degrees of freedom calculated for a one-sample t-test?

• n + 1
• n / 1
• n - 1

  What is the critical value for a two-tailed t-test at a 0.01 significance level with 10 degrees of freedom?

• 3.245
• 3.169
• 3.105

In the context of hypothesis testing, what is the critical value used for?

• Determining the rejection region for a test statistic
• calculating sample mean
• finding the sample size

  In an independent samples t-test with two samples (n1 = 10 and n2 = 12), what is the total degrees of freedom (df)?

• 20
• 21
• 22
• 19