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1. You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 6.
Find the critical value that corresponds to a confidence level of 99.3%.
Use a spreadsheet and the formula
=T.INV.2T(probability, degrees of freedom)
ta/2 =
2.You measure 43 watermelons' weights, and find they have a mean weight of 66 ounces. Assume the sample weights' standard deviation is 11.4 ounces. Based on this, construct a 95% confidence interval for the true population mean watermelon weight.
Sagot :
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