Question

Consider the following random sample of diameter measurements (in inches) of 19 softballs: 4.83, 4.77, 4.85, 4.88, 4.81, 4.7, 4.81, 4.9, 4.75, 4.73, 4.71, 4.76, 4.84, 4.83, 4.69, 4.68, 4.68, 4.7, 4.81 Send data to Excel If we assume that the diameter measurements are normally distributed, find a 90% 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. (If necessary, consult a list of formulas.) What is the lower limit of the confidence interval? What is the upper limit of the confidence interval?

Answer 1

The statistical software output for this problem is :

One sample T confidence interval: u: Mean of variable 90% confidence interval results: Variable Sample Mean Std. Err. DF L. Limit U. Limit Data 4.7752632 0.016210754 18 4.7471527 4.8033736

Lower limit = 4.75

Upper limit = 4.80