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Chapter 8: Q.62 (page 481)
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 ?
The sample size is.
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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?
If the Census did another survey, kept the error bound the same, and surveyed only people instead of , what would happen to the level of confidence? Why?
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. = _____
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.
Calculate the following:
a. lower limit
b. upper limit
c. error bound
A poll of 1,200 voters asked what the most significant issue was in the upcoming election. Sixty-five percent answered the economy. We are interested in the population proportion of voters who feel the economy is the most important.
Construct a 90% confidence interval, and state the confidence interval and the error bound.
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