Create a 90% confidence interval for the mean

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Reference no: EM131383551

LA rainfall. The Los Angeles Almanac website reports recent annual rainfall (in inches), as shown in the table.

a) Create a 90% confidence interval for the mean annual rainfall in LA.

b) If you wanted to estimate the mean annual rainfall with a margin of error of only 2 inches, how many years' data would you need?

c) Do these data suggest any change in annual rainfall as time passes? Check for an association between rainfall and year.

Reference no: EM131383551

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