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Chapter 8: Q.37 (page 479)
Using the same mean, standard deviation, and sample size, how would the error bound change if the confidence level were reduced to 90%? Why?
The error bound become smaller
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Define the random variables and in words.
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. ; ; ; ; ; ; ; ; ; ; ;
Suppose randomly selected people are surveyed to determine if they own a tablet. Of the surveyed, reported owning a tablet. Using a% confidence level, compute a confidence interval estimate for the true proportion of people who own tablets
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.
Define a new random variable P′. What is p′ estimating?
Which distribution should you use for this problem?
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