18.12 A psychologist employs a two-factor experiment to study the combined effect of sleep deprivation and alcohol consumption on the performance of automobile drivers. Before the driving test, the subjects go without sleep for various time periods and then drink a glass of orange juice laced with controlled amounts of vodka. Their performance is measured by the number of errors made on a driving simulator. Two subjects are randomly assigned to each cell, that is, each possible combination of sleep deprivation (either 0, 24, 48, or 72 hours) and alcohol consumption (either 0, 1, 2, or 3 ounces), yielding the following results:

(a) Summarize the results with an ANOVA table

(b) If appropriate, conduct additional F tests, estimate effect sizes, and use Tukey's HSD test.

NUMBER OF DRIVING ERRORS

ALCOHOL CONSUMPTION (OUNCES)SLEEP DEPRIVATION (HOURS)

0244872TrowT 2row

0025529841

3446

11365 361296

3378

23287532809

551112

344109684624

671315

X 2 = 1466Tcolumn25306467G = 186

T2column62590040964489G2 = 34596