SOLUTION: Consider the following random sample of diameter measurements (in inches) of 18 softballs: 4.88, 4.88, 4.76, 4.82, 4.69, 4.75, 4.72, 4.86, 4.81, 4.75, 4.86, 4.73, 4.78, 4.72,

Question 191707: Consider the following random sample of diameter measurements (in inches) of 18 softballs:
4.88, 4.88, 4.76, 4.82, 4.69, 4.75, 4.72, 4.86, 4.81, 4.75, 4.86, 4.73, 4.78, 4.72, 4.73, 4.78, 4.71, 4.87.
If we assume that the diameter measurements are normally distributed, find a 95% confidence interval for the mean diameter of a softball. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places.
What is the lower limit of the confidence interval?
What is the upper limit of the confidence interval?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Consider the following random sample of diameter measurements (in inches) of 18 softballs:
4.88, 4.88, 4.76, 4.82, 4.69, 4.75, 4.72, 4.86, 4.81, 4.75, 4.86, 4.73, 4.78, 4.72, 4.73, 4.78, 4.71, 4.87.
If we assume that the diameter measurements are normally distributed, find a 95% confidence interval for the mean diameter of a softball. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places.
What is the lower limit of the confidence interval?
What is the upper limit of the confidence interval?
-----------------------------------------------------------
You should be able to figure out the mean and the standard
deviation of the data sample.
Do that and post those numbers it with the problem. Those
numbers are needed in order to calculate the confidence interval.
=====================
Cheers,
Stan H.
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