1. A recent study stated that if a person smoked, the average of the number of cigarettes he or she smoked was 14 per day. To test the claim, a researcher selected a random sample of 40 smokers and found that the mean number of cigarettes smoked per day was 18. The standard deviation of the sample was 6. At a = 0.05, is the number of cigarettes a person smokes per day actually equal to 14? Construct a corresponding confidence interval for the population parameter.

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1. A recent study stated that if a person smoked, the average of the
number of cigarettes he or she smoked was 14 per day. To test the
claim, a researcher selected a random sample of 40 smokers and
found that the mean number of cigarettes smoked per day was 18.
The standard deviation of the sample was 6. At a = 0.05, is the
number of cigarettes a person smokes per day actually equal to 14?
Construct a corresponding confidence interval for the population
parameter.
Transcribed Image Text:1. A recent study stated that if a person smoked, the average of the number of cigarettes he or she smoked was 14 per day. To test the claim, a researcher selected a random sample of 40 smokers and found that the mean number of cigarettes smoked per day was 18. The standard deviation of the sample was 6. At a = 0.05, is the number of cigarettes a person smokes per day actually equal to 14? Construct a corresponding confidence interval for the population parameter.
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