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A sample of 29 paired observations generates the following data: d = 1.9 and s, = 3.8. Assume a normal distribution. (You may find it
useful to reference the appropriate table: z table or t table)
a. Construct the 90% confidence interval for the mean difference up. (Round intermediate calculations to at least 4 decimal places
and final answers to 2 decimal places.)
Confidence interval is
to
b. Using the confidence interval, test whether the mean difference differs from zero.
O There is evidence that the mean difference differs from zero.
O There is no evidence that the mean difference differs from zero.

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