Exam 11: Analysis of Variance

Sound levels are measured at random moments under typical driving conditions for various full-size truck models.The Excel ANOVA results are shown below. The test statistic to compare the five means simultaneously is

ANOVA is a procedure intended to compare the means of several groups (treatments).

One-factor ANOVA with two groups is equivalent to a two-tailed t-test.

ANOVA assumes normal populations.

Refer to the following output (some information is missing).The sample size was n = 24 in a one-factor ANOVA. At α = .05,what is the critical value of the Tukey test statistic for a two-tailed test for a significant difference in means that are to be compared simultaneously? Note: This question requires access to a Tukey table.

What is the .05 critical value of Tukey's test statistic for a one-factor ANOVA with n1 = 6,n2 = 6,n3 = 6? Note: This question requires access to a Tukey table.

Tukey's test is not needed if we have the overall F statistic for the ANOVA.

Given the following ANOVA table (some information is missing),find the F statistic.

Refer to the following partial ANOVA results from Excel (some information is missing). ANOVA table The F statistic is

It is desirable,but not necessary,that sample sizes be equal in a one-factor ANOVA.

For this one-factor ANOVA (some information is missing),what is the F-test statistic?

Tukey's test for five groups would require 10 comparisons of means.

Refer to the following partial ANOVA results from Excel (some information is missing). Degrees of freedom for between-groups variation are

Systolic blood pressure of randomly selected HMO patients was recorded on a particular Wednesday,with the results shown here: The appropriate hypothesis test is

Refer to the following partial ANOVA results from Excel (some information is missing). The number of treatment groups is