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The following data give the annual incomes (in thousands of dollars) and amounts (in thousands of dollars) of life insurance policies for eight persons.
Annual income
42
58
27
36
70
24
53
37
Life insurance
150
175
25
75
250
50
100
(a) Calculate the least-squares regression line for these data.
(b) Plot the points and the least-squares regression line on the same graph.
Do the confidence interval limits contain 98.6F? What does the sample suggest about the use of 98.6F as the mean body temp.
She will make the mean raise $1000 and the standard deviation $179. Basing this on worker productivity (toys constructed), the most productive 10% of employees will see a raise of at least how much?
Smith bicycled 45 miles going east from Durango, and Jones bicycled 70 miles. Jones averaged 5 miles per hour more than Smith, and his trip took one-half hour longer than Smith's. How fast was each one traveling?
Construct a cross tabulation to examine the relationships between the two nominal/ordinal level variables. Assume that you selected a random sample of two hundreds cases and collected data on these cases.
compute the following binomial probabilities directly from the formula for bx n p. round your answers to three decimal
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
Write up a brief description of the problem with the conclusion drawn from the hypothesis test. Note that the problem is not in the calculations--assume the calculations are correct--but in the interpretation of the test.
suppose that the mean of the annual return for common stocks from 2000 to 2012 was 14.37 and the standard deviation of
Random samples of populations (in thousands) of U.S. cities in three sections of the country are listed. Is there evidence to conclude a difference in means at the 0.001 level of significance?
The number of items rejected daily by the manufacturer because of defects for last 30 days are:
The standard deviation of the ages of a sample of 21 executives from the northern states was 8.4 years; while the standard deviation of the ages of a sample of 30 executives from southern states was 12.8 years.
the traditional view about the normal curve in psychology is that normal curves area rare in nature but often occur in
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