Question

A group of six individuals with high blood pressure volunteered to test whether petting cats for 10

minutes can alter systolic blood pressure levels. Systolic blood pressures (in millimeters of mercury,

or mmHg) were measured for each subject before and after petting cats for 10 minutes, with the

following results:

Individual

Before

After

1

162

151

2

188

143

3

159

107

4

185

166

5

197

140

6

197

177

A researcher claims that the mean reduction in systolic blood pressure is

8

mmHg.

Does the

98

%

Does confidence interval contradict this claim?

Answer 1

a)

TS = 4.2456

p-value = 0.0081 < alpha

hence we reject the null hypothesis

we conclude that there is sufficient evidence of differemce

b)

98% CI = (Xbar +- t * s/sqrt(n))

for difference

(7.053 ,60.947)

since 0 is note present in CI,   confidence interval does not contradict this claim

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