2. A (hypothetical) experiment is conducted on the effect of alcohol on perceptual motor ability. Ten subjects are each tested twice, once after having two drinks and once after having two glasses of water. The two tests were on two different days to give the alcohol a chance to wear off. Half of the subjects were given alcohol first and half were given water first. The scores of the 10 subjects are shown below. The first number for each subject is their performance in the “water” condition. Higher scores reflect better performance. Test to see if alcohol had a significant effect. Report the t and p values. water alcohol16 1315 1311 1020 1819 1714 1113 1015 1514 1116 16 Since water is without any experimental alteration, the null Ho is that the alcohol will have no effect and the data will not be different from water . Use the water as xbar and alcohol as mu. avg water 15.3sd water 2.669n water 10sqrt n water 3.16 avg alc 13.4sd alc 2.95n alc 10sqrt alc 3.16 t statistic= __________________________________________________________________________=z (Critical value for 95% is 1.96. This value, ___________, lies inside/outside of that critical value, so that tells us that we can/cannot reject the null Ho.) p-val = significant? (Try doing box plots with CI and standard curves to visualize the data, do these tell you anything before you have even done more extensive analysis?)
2. A (hypothetical) experiment is conducted on the effect of alcohol on perceptual motor ability. Ten subjects are each tested twice, once after having two drinks and once after having two glasses of water. The two tests were on two different days to give the alcohol a chance to wear off. Half of the subjects were given alcohol first and half were given water first. The scores of the 10 subjects are shown below. The first number for each subject is their performance in the “water” condition. Higher scores reflect better performance. Test to see if alcohol had a significant effect. Report the t and p values.
water alcohol
16 13
15 13
11 10
20 18
19 17
14 11
13 10
15 15
14 11
16 16
Since water is without any experimental alteration, the null Ho is that the alcohol will have no effect and the data will not be different from water . Use the water as xbar and alcohol as mu.
avg water 15.3
sd water 2.669
n water 10
sqrt n water 3.16
avg alc 13.4
sd alc 2.95
n alc 10
sqrt alc 3.16
t statistic= __________________________________________________________________________=z
(Critical value for 95% is 1.96. This value, ___________, lies inside/outside of that critical value, so that tells us that we can/cannot reject the null Ho.)
p-val =
significant?
(Try doing box plots with CI and standard curves to visualize the data, do these tell you anything before you have even done more extensive analysis?)
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