# STATs 353

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Find the 98% confidence interval for estimating ìd based on these paired data and assuming normality. (Give your answers correct to one decimal place.)

Before

68,58,64,62,58,67

After

40,42,46,37,45,38

Lower limit:
Upper limit:

• STATs 353 -

You'll need to start by finding a confidence interval for 2 samples.

Here is one you might be able to use:

CI = (mean difference) ± t-value (standard deviation difference/√n)

You will need to calculate the means and standard deviations.

T-value is found using a t-table for 98% confidence.

n = sample size

Once you have the interval calculated, you will have the lower and upper limits.

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