1.
(Moore PBS)
The data below are increases in Math scores after two groups of people were exposed to different subliminal messages.
Is
there evidence that the increases in the treatment group (each day I
am getting better in Math) are in general greater than those in the control
group (people are walking on the street)?
Conduct an appropriate nonparametric test, detail all the steps and use 01.0=a .
Treatment: 6
7
10
11
11
12
13
13
15
16
Control: 4
5
5
7
8
11
12
14
2.
(DASL)
Two groups of people were given a balance test where each person had to stand on a platform and maintain stable upright position,
then react to unexpected noises by pressing a button as quickly as possible.
The data below are the mean measurements per person of forward
backward sway (in mm) when reacting to the noise.
Is there evidence here that the two groups had significantly different amounts of forward
backward sway?
Conduct an appropriate nonparametric test, detail all the steps and use 05.0=a .
Elderly: 19
19
20
21
24
25
29
30
50
Young:
14
14
15
17
17
21
22
25
3.
(Adapted from DASL.)
Twentytwo tenors had a mean height of 69.2 inches with standard deviation 3.2 inches.
Is this evidence that the
mean height of all tenors is less than 71 inches?
Conduct an appropriate hypothesis test using the Pvalue approach, detail all the steps and use
01.0=a .
4.
Seventeen bags of tortilla chips had a mean weight of 13.7 oz with standard deviation 0.6 oz.
We are interested in knowing if this is any
indication that the mean weight of all bags of tortilla chips is greater than 13 oz.
Conduct an appropriate hypothesis test using a 99%
confidence interval, detail all the steps.
5.
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 Spring '09
 thomas
 Statistics, Normal Distribution, Statistical hypothesis testing, appropriate hypothesis test

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