(A) You Can Be 95% Confident That the Mean Salary

question 81

Essay

(A) You can be 95% confident that the mean salary for all production managers with at least 15 years of experience is between what two numbers (the t-multiple with 8 degrees of freedom is 2.306). What assumption are you making about the distribution of salaries?
​
(B) What sample size would be needed to ensure that we could estimate the true mean salary of all production managers with more than 15 years of experience and have only 5 chances in 100 of being off by more than $4200?

---

Definitions:

Variance

A statistical measure of the dispersion or spread in a set of data points, indicating how much the values differ from the mean of the set.

Variance

A measure of variability that denotes the average of the squared differences from the mean, showing how widely the values in a data set are spread.

Squared Deviations

Values obtained by subtracting the mean from each data point in a set, squaring the result to eliminate negative numbers, used in variance calculation.

Aptitude Test

An examination designed to measure a person's ability to develop skills or acquire knowledge, predicting future performance.