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A researcher has gathered information from a random sample of 178 households. For each variable below, construct confidence intervals to estimate the population mean. Use the 90% level.
a. An average of 2.3 people resides in each household. Standard deviation is .35.
b. There was an average of 2.1 television sets (s = .10) and .78 telephones (s = .55) per household.
c. The households averaged 6.0 hours of television viewing per day (s = 3.0).
General Discrete Random Variable
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determine the sample size needed to construct a 90 confidence interval to estimate the population mean when ? 75 and
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