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Chapter 8: Q.65 (page 481)
Define the random variables and in words.
is the number of successes.
is the percentage of households sampled.
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The data in the Table are the result of a random survey of national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let the number of colors on a national flag.
Construct a confidence interval for the true mean number of colors on national flags.
How much area is in each tail?
Construct a confidence interval for the population mean time to complete the forms. State the confidence interval, sketch the graph and calculate the error bound.
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.
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 average pizza delivery times are normally distributed with an unknown population mean and a population standard deviation of six minutes. A random sample of pizza delivery restaurants is taken and has a sample mean delivery time of minutes.
Find a % confidence interval estimate for the population mean delivery time.
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