6. A research firm conducted a survey to determine the mean amount steady smokers spend on...

6. A research firm conducted a survey to determine the mean amount steady smokers spend on cigarettes during a week. They found that the distribution of amounts spent per week followed a normal distribution with a standard deviation of $5. A sample of 49 steady smokers revealed a mean of $20

a) What is the point estimate for the population mean?

b) Using the 95% level of confidence, determine the confidence interval for the population mean.

c) Determine the 85% confidence interval for the population mean.

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Expert Solution

orchestra answered 1 year ago

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