Asked by TOM7
The amount of fill (weight of contents) put into a glass jar of spaghetti sauce is normally distributed with mean ì = 843 grams and standard deviation of ó = 9 grams
(d) Find the mean of the x distribution. (Give your answer correct to the nearest whole number.)
843 Was my answer.
(ii) Find the standard error of the x distribution. (Give your answer correct to two decimal places.)
Not sure of formula to work this one
(e) Find the probability that a random sample of 20 jars has a mean weight between 836 and 855 grams. (Give your answer correct to four decimal places.)
Not sure of formula to work this one
(d) Find the mean of the x distribution. (Give your answer correct to the nearest whole number.)
843 Was my answer.
(ii) Find the standard error of the x distribution. (Give your answer correct to two decimal places.)
Not sure of formula to work this one
(e) Find the probability that a random sample of 20 jars has a mean weight between 836 and 855 grams. (Give your answer correct to four decimal places.)
Not sure of formula to work this one
Answers
Answered by
PsyDAG
2) SEm = SD/√n
e) Z = (score-mean)/SEm
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
e) Z = (score-mean)/SEm
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.
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