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An online survey asked 397 how much extra in taxes they would be willing to pay...

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Statistics

An online survey asked 397 how much extra in taxes they would bewilling to pay to protect the environment. The sample average was$599 with a sample standard deviation of $180. Is it appropriate touse a normal distribution to approximate a confidence interval forthe population mean? If it’s inappropriate, indicate why.

Select one:

a. Yes.

b. No, because it was not a random sample.

c. No, because n(p-hat) < 10 or n(q-hat) < 10.

d. No, because the sample size wasn’t at least 30 and thepopulation wasn’t normally distributed.

e. No, because we already know the population mean.

Answer & Explanation Solved by verified expert
4.4 Ratings (696 Votes)
Answer bNo because it was not a random sample Explanation In order to use normal distribution for confidence interval the data must satisfy following conditions Randomization Condition The data must be sampled    See Answer
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