# Question

In Chapter 1, we described graphically using a frequency distribution table and a histogram the time (in seconds) for a random sample of n = 110 employees to complete a particular task. Describe the data numerically based on the frequency distribution given in Table 1.7. The data is stored in the data file Completion Times.

a. Compute the mean using Equation 2.21.

b. Compute the variance using Equation 2.22.

c. Compare your answers to the mean and variance calculated in Exercise 2.23.

a. Compute the mean using Equation 2.21.

b. Compute the variance using Equation 2.22.

c. Compare your answers to the mean and variance calculated in Exercise 2.23.

## Answer to relevant Questions

Following is a random sample of seven (x, y) pairs of data points: 11, 52 13, 72 14, 62 15, 82 17, 92 13, 62 15, 72 a. Compute the covariance. b. Compute the correlation coefficient. A department-store chain randomly sampled 10 stores in a state. After a review of sales records, it was found that, compared with the same period last year, the following percentage increases in dollar sales had been ...In Example 2.9 we calculated the variance and standard deviation for Location 1 of Gilotti's Pizzeria restaurants. Use the data in the data file Gilotti's Pizzeria to find the variance and the standard deviation for Location ...The supervisor of a very large plant obtained the time (in seconds) for a random sample of n = 110 employees to complete a particular task. The data is stored in the data file Completion Times. a. Find and interpret the ...The sample space contains 10 As and 6 Bs. What is the probability that a randomly selected set of 4 will include 2 As and 2 Bs?Post your question

0