In the past, thẻ mean age of students at a summer camp was 16.9 years old. A recent sample of 16 students from the camp found = 13.4, s 2.3. a. Build a 80% 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 CI 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 16.9 years old. O Yes, the mean has probably changed since the old value of u is not right in the middle of the new CI the mean has not changed since the old value of u is right in the middle of the new CI O No, 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 C. For this problem, it is important that we know that ages are normally distributed. This is because: we are using a Z-interval On< 30 we are using a T-interval we are using s in place of o

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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In the past, the mean age of students at a summer camp was 16.9 years old. A recent sample of 16
students from the camp found x =
13.4, s = 2.3.
a. Build a 80% 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 CI to decide whether the mean age of students at the camp has changed from 16.9 years old.
O Yes, the mean has probably changed since the old value of u is not right in the middle of the new CI
No, the mean has not changed since the old value of u is right in the middle of the new
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 CI does not contain the old value of u
c. For this problem, it is important that we know that ages are normally distributed. This is because:
O we are using a Z-interval
On < 30
we are using a T-interval
O we are using s in place of o
Transcribed Image Text:In the past, the mean age of students at a summer camp was 16.9 years old. A recent sample of 16 students from the camp found x = 13.4, s = 2.3. a. Build a 80% 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 CI to decide whether the mean age of students at the camp has changed from 16.9 years old. O Yes, the mean has probably changed since the old value of u is not right in the middle of the new CI No, the mean has not changed since the old value of u is right in the middle of the new 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 CI does not contain the old value of u c. For this problem, it is important that we know that ages are normally distributed. This is because: O we are using a Z-interval On < 30 we are using a T-interval O we are using s in place of o
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