Question

A scientist wanted to answer if self-control can be restored during intoxication. To do this, an experiment was performed by randomly assigning 5 males to each of four groups (aka there’s 5 people in each group). Group A received 0.62mg/kg of alcohol. Group B received alcohol plus caffeine. Group C received alcohol and a monetary reward for performance. Group D received a placebo. Scores on a word stem completion task involving ‘controlled (effortful) memory processes’ were recorded for all groups. Higher scores in this task represents greater control. If the below is the result to each group, what’s the answer to the experiment?

A	B	C	D
8	6	7	8
9	10	9	3
10	5	10	7
3	3	7	6
5	10	8	8

A) What is the null and alternative hypothesis? b)Fill out values for the ANOVA table:

	SS	DF	MS
Between
Within
Total

C) Identify critical value(s)? D) Calculate F value? E) What is the conclusion?

Answer 1

A) What is the null and alternative hypothesis?

The hypothesis being tested is:

H0: µ1 = µ2 = µ3 = µ4

Ha: At least one means is not equal

b)Fill out values for the ANOVA table:

Source of Variation	SS	df	MS
Between Groups	9	3	3
Within Groups	96.8	16	6.05
Total	105.8	19

C) Identify critical value(s)?

3.24

D) Calculate F value?

0.50

E) What is the conclusion?

Since 0.50 < 3.24, we fail to reject the null hypothesis.

Therefore, we cannot conclude that self-control can be restored during intoxication.