Chapter 10: Q. 66 (page 599)
find the ?
Chapter 10: Q. 66 (page 599)
find the ?
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Get started for freeUse the following information to answer next five exercises. A study was conducted to test the effectiveness of a juggling class. Before the class started, six subjects juggled as many balls as they could at once. After the class, the same six subjects juggled as many balls as they could. The differences in the number of balls are calculated. The differences have a normal distribution. Test at the significance level.
What conclusion can you draw about the juggling class?
A study is done to determine if Company A retains its workers longer than Company B. Company A samples workers, and their average time with the company is five years with a standard deviation of Company B samples workers, and their average time with the company is with a standard deviation of The populations are normally distributed.
a. Are the population standard deviations known?
b. Conduct an appropriate hypothesis test. At the significance level, what is your conclusion?
Use the following informotion to answer the next 12 exercises: The U.S. Center for Disease Control reports that the mean life expectancy was \(47.6\) years for whites born in 1900 and \(33.0\) years for nonwhites. Suppose that you randomly survey death records for people born in 1900 in a certain county. Of the 124 whites, the mean life span was \(45.3\) years with a standard deviation of \(12.7\) years. Of the 82 nonwhites, the mean life span was \(34.1\) years with a standard deviation of \(15.6\) years. Conduct a hypothesis test to see if the mean life spans in the county were the same for whites and nonwhites.
Which distribution (normal or Student's t) would you use for this hypothesis test?
It is thought that teenagers sleep more than adults on average. A study is done to verify this. A sample of 16 teenagers has a mean of 8.9 hours slept and a standard deviation of 1.2. A sample of 12 adults has a mean of 6.9 hours slept and a standard deviation of 0.6.
Find the p-value?
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