In the past, the mean age of students at a summer camp was 13.6 years old. A recent sample of 14 students from the camp found 14.4, s = 2.3. %3D a. Build a 99% CI for the current mean age of students at the camp. 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 ClI to decide whether the mean age of students at the camp has changed from 13.6 years old. O No, the mean has not changed since the old value of u is right in the middle of the new Cl OYes, the mean has probably changed since the old value of u is not right in the middle of the new Cl O No, the mean has probably not changed since the new Cl contains the old value of u OYes, the mean has probably changed since the new Cl does not contain the old value of u or c. For this problem, it is important that we know that ages are normally distributed. This is because: we are using s in place of o On< 30 we are using a Z-interval we are using a T-interval Ouertion

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Question 22
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In the past, the mean age of students at a summer camp was 13.6 years old. A recent sample of 14
students from the camp found = 14.4, s = 2.3.
a. Build a 99% CI for the current mean age of students at the camp.
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 Cl to decide whether the mean age of students at the camp has changed from 13.6 years old.
O No, the mean has not changed since the old value of u is right in the middle of the new Cl
O Yes, the mean has probably changed since the old value of u is not right in the middle of the new Cl
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 u
tor
c. For this problem, it is important that we know that ages are normally distributed. This is because:
O we are using s in place of o
On< 30
O we are using a Z-interval
O we are using a T-interval
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Transcribed Image Text:Question 22 > In the past, the mean age of students at a summer camp was 13.6 years old. A recent sample of 14 students from the camp found = 14.4, s = 2.3. a. Build a 99% CI for the current mean age of students at the camp. 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 Cl to decide whether the mean age of students at the camp has changed from 13.6 years old. O No, the mean has not changed since the old value of u is right in the middle of the new Cl O Yes, the mean has probably changed since the old value of u is not right in the middle of the new Cl 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 u tor c. For this problem, it is important that we know that ages are normally distributed. This is because: O we are using s in place of o On< 30 O we are using a Z-interval O we are using a T-interval Submit Question MacBook Air F8 F9 吕口 O00 D00 F4 F6 F5 F2 F3 & 2$ 4 @ 2#3 8. 3 W E R Y 61
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