Growth Spurt: It is generally known that boys grow at an unusually fast rate between the ages of about 12 and 14

.Following are heights, in inches of 10 boys, measured at age 12

and again at age 14.

Age 12	Age 14
62.1	67.1
62.8	68.1
65.3	69.9
60.4	66.7
55.4	61.8
58.7	64.2
64.3	69.8
58.1	63.3
63.3	69.6
61.2	66.4
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Part 1 of 2

(a) Construct a 99.9% confidence interval for the mean increase in height for boys between the ages of 12 and 14

.Let d represent the height at age 14 minus the height at age 12

. Use the TI-84 calculator to find the critical value and round the answers to at least two decimal places.

A 99.9% confidence interval for the mean increase in height for boys between 12 and 14 is <d< .

Part 2 Does it contradict or does not contradict?