In reference to Problem 1, a random sample of 9 customers was taken. Mu=75K n=9 sigma=15K...

In reference to Problem 1, a random sample of 9 customers was taken. Mu=75K n=9 sigma=15K a What is the probability that the sample mean is below $70K? b. What proportion of the sample mean are above $80K? c. What percentage of the sample means are be between $70K and $80K? d. If the data was not distributed as a Normal Distribution, would you be able to answer the above questions?

Expert Solution

orchestra answered 2 years ago

For a random sample of size 64 from a population with mu=24 and standard deviation sigma=1.5....

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A random sample of 29 lunch customers was taken at a restaurant The average amount of time the customers in the sample stayed in the restaurant was 45 minutes with a standard deviation of 14 minutes. a) Compute the standard error of the mean? b) Construct a 68% confidence interval for the true average amount of time customers spent in the restaurant? c) Construct a 90% confidence interval for the true average amount of time customers spent in the restaurant?...

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