Captain D’s tuna is sold in cans that have a net weight of 8.015 ounces. The weights are normally distributed with a mean of 8.015 ounces and a standard deviation of 0.11 ounces. You take a sample of 35 cans. Compute the probability that the sample would have a mean:
greater than 8.01 ounces?
less than 8.025 ounces?
between 7.995 and 8.04 ounces
The Corporate Lawyer, a magazine for corporate lawyers, would like to report the mean amount earned by lawyers in their area of specialization. How large a sample is required if the 99 percent level of confidence is used and the estimate is to be within $1,200? The population standard deviation is $15,000.
3 answers
Second problem:
Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
The Corporate Lawyer, a magazine for corporate lawyers, would like to report the mean amount earned by lawyers in their area of specialization. How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
1 answer