Question 1
A local consumer reporter wants to compare the average costs of grocery items purchased at three different supermarkets, A, B, and C. Prices (in dollars) were recorded for a sample of 60 randomly selected grocery items at each of the three supermarkets. In order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket.
The results of the Bonferroni analysis are summarized below.
___________________
________________
Supermarket
A
B
C
Mean Price
1.66
1.80
1.94
Fully interpret the Bonferroni analysis.
Question 2
Suppose an experiment utilizing a random block design has 4 treatments and 10 blocks for a total of 40 observations. Assume that the total Sum of Squares for the response is SS(Total) = 300. If the Sum of Squares for Treatments (SST) is 20% of SS(Total), and the Sum of Squares for Blocks (SSB) is 40% of SS (Total), find the
F values for this experiment.
◦ treatments:
F = 3.38; blocks:
F = 2.70
◦ treatments:
F = 6.5; blocks:
F = 4.33
◦ treatments:
F = 4.50; blocks:
F = 3.00
◦ treatments:
F = 20.83; blocks:
F = 6.94
Experiment of Lederberg and Tatum demonstrating gene transfer in E. coli.
The experiment of Plaxton and his colleagues demonstrated that plants can alter their metabolism in
Aspirin and most other NSAIDs block prostaglandins.
Sample of a business card design.
Rosenthal and Fode’s Rat Experiment
Experiment: Response to Auxin