52) The following MINrr AB output presents a 95% confidence interval 52) The ass

Question

52) The following MINrr AB output presents a 95% confidence interval 52) The assumed sigma 7.9655 Variable N Mean SE Mean 95% CI x56 53.559 1.0644 (51.473, 55.645 Find the sample size needed so that the 99% confidence interval will have a margin of ei A) 15 B) 284 C) 202 D) 348 53) Find the critical value /ar2 needed to construct a confidence interval of the given level 53) with the given sample size. Level 95%, sample size 1 1 A) 2.228 B) 2.201 C) 1.812 D) 1.960 54) 54) Boxes of raisins are labeled as containing 22 ounces. Following are the weights, in ounces, of a sample of 12 boxes. It is reasonable to assume that the population is approximately normal. 21.72 21.75 21.62 21.92 22.10 22.13 22.25 22.26 22.04 21.88 22.02 22.15 Construct a 95% confidence interval for the mean weight. A) 21.790

Explanation / Answer

53) We can use the t table to find this

First we need degrees of freedom

n = 11

dof = n - 1 = 10

alpha = 0.05

tcritical = 2.228 (two tail)

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