#19, only this time assume the value $2.5 is the population standard deviation.

Question

#19, only this time assume the value $2.5 is the population standard deviation. Then, state this Redo interval below within an interpretive sentence tied to the given context. It is 95% likely that the population mean of how many times US families eat their evening meal at home is between 3.107 and 4.493 times a week. A large medical organization is interested in studying the mean amount spent by all US citizens on tobacco products each week. The results must be at a 95% confidence level with a maximum margin of error of $5. Assuming that previous reliable study allows one to estimate the population standard deviation of $35, what sample size is needed to meet these requirements? Solution KEY Unit 2 Problem Set pe here to search

Explanation / Answer

Q-2.

MOE=Z*sigma / sqrt(n) where MOE=margin of error

Substituting z=1.96(for 95% confidence level

sigma is standard deviation i.e. 35

MOE=5

So,5=1.96*35/sqrt(n)

So n = 188.24 i.e. 189

So,the sample size is 189

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