Chapter 8: Q.44 (page 479)
Define the random variable X in words.
The random variable indicates the amount of time Americans spend watching television every month.
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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 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.
What isestimating?
When designing a study to determine this population proportion, what is the minimum number you would need to survey to be confident that the population proportion is estimated to within ?
Suppose we have data from a sample. The sample mean is , and the error bound for the mean is . What is the confidence interval estimate for the population mean?
Construct a confidence interval for the population mean weight of newborn elephants. State the confidence interval, sketch the graph and calculate the error bound.
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