Question Help * You are the widths of the (Round to two decimal places as needed

Question

Question Help * You are the widths of the (Round to two decimal places as needed.) The 95% co fidence interval is (Round to two decimal places as needed.) Interpeet the results. Choose the correct answer below OA with90% artance, a can be said that r. population mean priceles n te trt interval. With 95% confidence, it can be sad hat the population mean poles in the second interval The 95% corf dence merval is narrower than the 90%. With 90% tcan be said that the sample mean price ies in te trst ntonaLwith 95% confidence. zcan be said that the sample mean poe hes ite dnwaf. The 95% nterval is °C, with 90% itar, be sad that the population mean price les inthe srst interval with 96% t can be said that the population mean price les in the second interval. The 1 8 0 2

Explanation / Answer

First Question)

Confidence Interval:

X bar (-/+) E

90% confidence interval:

X bar = 132

E = tc * ( s / sqrt (n))

tc is the critical value we get it from excel for 59 degrees of freedom at 10% level of significance as 1.671.

E = 1.671 * ( 16.2/sqrt(60))

   = 3.495

X bar (-/+) E

132 (-/+)3.495

128.51 and 135.49

Answer:

The 90% confidence interval is 128.51 - 135.49

95% confidence interval:

X bar = 132

E = tc * ( s / sqrt (n))

tc is the critical value we get it from excel for 59 degrees of freedom at 5% level of significance as 2.001.

E = 2.001 * ( 16.2/sqrt(60))

   = 4.185

X bar (-/+) E

132 (-/+) 4.185

127.82 and 136.18

Answer:

The 95% confidence interval is 127.82 – 136.18

Answer: Option ( C. )

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