1.A scientist wishes to use two-way ANOVA to investigate the effects of different fertilizer types and potting materials when growing a certain type of plant. If the scientist will test 2 different fertilizers and 2 different potting materials, as well as the interaction between the two factors, what is the minimum number of total plants needed for the experiment?

2. To determine whether three internet browsers differ in the average amount of time it takes to load websites, the browsers are randomly assigned to load ten different popular websites.Assuming the conditions are met, which test should be performed to determine whether the average loading time is different for any of the browsers? Because loading times vary a lot from website towebsite, this source of variation must be taken into account, even though we are not interested in it.

A.ANOVA with blocking

B.Chi-square test for association

C.Welch's ANOVA

D.One-way ANOVA

3. Which of the following is NOT an assumption of one-way ANOVA?

A.Equal variance

B.Equal sample sizes

C.Normal residuals

D.Independent samples

4.Fill in the blank: If a test performs well, even when an assumption is somewhat violated, we say the test is _____ to that assumption.

A.immune

B.robust

C.powerful

D.significant