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In 2006 the age distribution for mothers in the United States who had a first child that year was as follows (Martin et al., p. 31):
Under 20
20 - 24
25 - 29
30 - 34
35 and Over
20.9%
30.6%
24.7%
15.7%
8.1%
a. Draw a bar graph to represent the data.
b. Draw a pie chart to represent the data.
c. Explain which picture-bar graph or pie chart-you think is more informative.
Are the data sufficient to conclude that children with a history of childcare show significantly more behavioral problems than the average kindergarten child? Use a one-tailed test with a = .01.
the lenght of time x to complete a standard achievement test is approximately normally distributed with a mean of 58
Consider the following estimated regression equation, based on 10 observations.
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in the linear regression model it was found that the 90 confidence interval for the regression coefficient b is 1.59.3.
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Is there enough evidence to reject the claim that the average cost of a home in both locations is the same? Use α = 0.01. Clearly mark each of the five steps in hypothesis testing.
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A major US airline records the number of no-shows on a flight that operates each day from Seattle to San Francisco. A no-show is a passenger who purchases a ticket but fails to arrive at the gate at time of departure. The attached table indicates ..
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