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Chapter 8: Q.59 (page 481)
In one complete sentence, explain what the interval means.
The interval means is between colors and colors.
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Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its mean number of unoccupied seats per flight over the past year. To accomplish this, the records of 225 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The sample mean is 11.6 seats and the sample standard deviation is 4.1 seats.
a. i. __________
ii. __________
iii. __________
iv. __________
b. Define the random variables and in words.
c. Which distribution should you use for this problem? Explain your choice.
d. Construct a 92% confidence interval for the population mean number of unoccupied seats per flight.
i. State the confidence interval.
ii. Sketch the graph.
iii. Calculate the error bound.
The U.S. Census Bureau conducts a study to determine the time needed to complete the short form. The Bureau surveys people. The sample mean is minutes. There is a known standard deviation of minutes. The population distribution is assumed to be normal.
Identify the following:
a. = _____
b. = _____
c. = _____
How much area is in both tails (combined)?
A random sample of statistics students were asked to estimate the total number of hours they spend watching television in an average week. The responses are recorded in Table . Use this sample data to construct a % confidence interval for the mean number of hours statistics students will spend watching television in one week.
Table
Use the following information to answer the next two exercises: Five hundred and eleven homes in a certain southern California community are randomly surveyed to determine if they meet minimal earthquake preparedness recommendations. One hundred seventy-three of the homes surveyed met the minimum recommendations for earthquake preparedness, and did not.
Find the confidence interval at the Confidence Level for the true population proportion of southern California community homes meeting at least the minimum recommendations for earthquake preparedness.
a.
b.
c.
d.
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