from the creek a. Build a 90% Cl for the current mean length of trout in Clearwater Creek. Round all intermediate calculations to two decimals, then construct the Cl and enter like this: (min,max). Note: if you use a built-in Cl command on a calculator/computer, you might get marked wrong du to rounding. Use the formulas given in the text/notes. b. Use your CI to decide whether the mean length of trout in Clearwater Creek has changed from 17.1 inches. iddle of the new CI

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Question 21
In the past, trout in Clearwater Creek were 17.1 inches long on average. A recent sample of 38 trout
from the creek found = 12.7, s = 2.5.
a. Build a 90% Cl for the current mean length of trout in Clearwater Creek.
Round all intermediate calculations to two decimals, then construct the Cl and enter like this:
(min,max).
Note: if you use a built-in Cl command on a calculator/computer, you might get marked wrong due
to rounding. Use the formulas given in the text/notes.
b. Use your CI to decide whether the mean length of trout in Clearwater Creek has changed from
17.1 inches.
O No, the mean has not changed since the old value of µ is right in the middle of the new CI
O No, the mean has probably not changed since the new Cl contains the old value of u
O Yes, the mean has probably changed since the new Cl does not contain the old value of µ
octor
O Yes, the mean has probably changed since the old value of µ is not right in the middle of the
new CI
m
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Transcribed Image Text:く Question 21 In the past, trout in Clearwater Creek were 17.1 inches long on average. A recent sample of 38 trout from the creek found = 12.7, s = 2.5. a. Build a 90% Cl for the current mean length of trout in Clearwater Creek. Round all intermediate calculations to two decimals, then construct the Cl and enter like this: (min,max). Note: if you use a built-in Cl command on a calculator/computer, you might get marked wrong due to rounding. Use the formulas given in the text/notes. b. Use your CI to decide whether the mean length of trout in Clearwater Creek has changed from 17.1 inches. O No, the mean has not changed since the old value of µ is right in the middle of the new CI O No, the mean has probably not changed since the new Cl contains the old value of u O Yes, the mean has probably changed since the new Cl does not contain the old value of µ octor O Yes, the mean has probably changed since the old value of µ is not right in the middle of the new CI m Submit Question APR étv 21 MacBook Air 000 O00 F4 F1 F2 F3 F5 F6 F7 F8 2$ 4. & 3 8 t6 5
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