Chapter 8: Q.34 (page 479)
Fill in the blanks on the graph with the areas, upper and lower limits of the confidence interval, and the sample mean.
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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 data in Table 8.10 are the result of a random survey of 39 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 X = the number of colors on a national flag.
Construct a 95% confidence interval for the true mean number of colors on national flags.
Using the same , , and n = 39, how would the error bound change if the confidence level were reduced to 90%? Why?
Define the random variable X in words.
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 population standard deviation for the height of high school basketball players is three inches. If we want to be % confident that the sample mean height is within one inch of the true population mean height, how many randomly selected students must be surveyed?
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