# Question

In Chapter 1 we described graphically, with a frequency distribution and histogram, the time (in seconds) for a random sample of n = 110 employees to complete a particular task. Describe the data in Table 1.6 numerically. The data are stored in the data file Completion Times.

a. Find the mean time.

b. Find the variance and standard deviation.

c. Find the coefficient of variation.

a. Find the mean time.

b. Find the variance and standard deviation.

c. Find the coefficient of variation.

## Answer to relevant Questions

The assessment rates (in percentages) assigned to a random sample of 40 commercially zoned parcels of land in the year 2012 are stored in the data file Rates. a. What is the standard deviation in the assessment rates? b. ...A manufacturer of portable radios obtained a sample of 50 radios from a week’s output. The radios were checked and the numbers of defects were recorded as follows. Calculate the standard deviation. 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 consumer goods company has been studying the effect of advertising on total profits. As part of this study, data on advertising expenditures (in thousands of dollars) and total sales (in thousands of dollars) were ...An auditor finds that the values of a corporation's accounts receivable have a mean of $295 and a standard deviation of $63. a. It can be guaranteed that 60% of these values will be in what interval? b. It can be guaranteed ...Post your question

0