Chapter 8: Q.46 (page 479)
Which distribution should you use for this problem?
Short Answer
The distribution required for this problem is distribution with parameters
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Chapter 8: Q.46 (page 479)
Which distribution should you use for this problem?
The distribution required for this problem is distribution with parameters
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Using the same , , and level of confidence, suppose that were instead of . Would the error bound become larger or smaller? How do you know?
Construct a confidence interval for the population mean hours spent watching television per month.
(a) State the confidence interval
(b) sketch the graph, and
(c) calculate the error bound.
The mean age for all Foothill College students for a recent Fall term was . The population standard deviation has been pretty consistent at . Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was . We are interested in the true mean age for Winter Foothill College students. Let the age of a Winter Foothill College student.
As a result of your answer to Exercise , state the exact distribution to use when calculating the confidence interval.
The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12, beginning ice-skating class was picked. In that class were 64 girls and 16 boys. Suppose that we are interested in the true proportion of girls, ages 8 to 12, in all beginning ice-skating classes at the Ice Chalet. Assume that the children in the selected class are a random sample of the population.
State the estimated distribution of
You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of sleep subjects get each night. You measure hours of sleep for subjects with the following results. Construct a % confidence interval for the mean number of hours slept for the population (assumed normal) from which you took the data. ; ; ; ; ; ; ; ; ; ; ;
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