- #1

k77i

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## Homework Statement

To test the efficacy of a new cholesterol-lowering medication, 10 people are selected at random. Each has their LDL levels measured (shown below as Before), then take the medicine for 10 weeks, and then has their LDL levels measured again (After).

Before After

195 175

131 129

141 105

182 184

173 138

123 120

147 115

156 144

125 87

161 137

Give a 95.8% confidence interval for meanB - meanA , the difference between LDL levels before and after taking the medication.

## Homework Equations

d(bar) - t(alpha/2)(Sd/sqrt(n)) < meanDifference < d(bar) + t(alpha/2)(Sd/sqrt(n))

## The Attempt at a Solution

I found all the values using excel:

d(bar) = 20

t(alpha/2) = 2.368676

Sd = 190.36

n = 10 (given)

and my answer was (-122.586 < meanDifference < 162.586)

but this is incorrect