Standard deviation: (13.6045,31.3170)

asked 2021-06-04

asked 2021-06-17

4.477 4.425 4.034 4.317 4.003 3.760 3.818 3.749 4.240 3.941 4.131 4.545 3.958 3.741 3.859 3.816 4.448 4.206

asked 2021-05-13

asked 2021-07-02

6.5 5.0 5.2 3.3 6.6 6.3 5.1 5.3 5.4 9.5 7.5

4.5 5.8 8.6 6.9 8.1 6.0 6.7 7.9 8.8 7.1 7.9

7.2 18.4 9.1 6.8 12.5 4.2 7.1 9.9 9.5 2.8 4.9

asked 2021-05-29

Construct the indicated confidence intervals for (a) the population variance

\(\displaystyle\sigma^{{{2}}}\)

and (b) the population standard deviation

\(\displaystyle\sigma\)

Assume the sample is from a normally distributed population.

\(\displaystyle{c}={0.95},{s}^{{{2}}}={11.56},{n}={30}\)

\(\displaystyle\sigma^{{{2}}}\)

and (b) the population standard deviation

\(\displaystyle\sigma\)

Assume the sample is from a normally distributed population.

\(\displaystyle{c}={0.95},{s}^{{{2}}}={11.56},{n}={30}\)

asked 2021-05-16

asked 2021-06-12

You are given the sample mean and the population standard deviation. Use this information to construct 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 48 business days from January 4, 2010, through February 24, 2017, U.S. gold prices had a mean of $1368.48. Assume the population standard deviation is $202.60.

asked 2021-05-26

You are given the sample mean and the population standard deviation. Use this information to construct 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 36 business days from February 24, 2016, through February 24, 2017, the mean closing price of Apple stock was $116.16. Assume the population standard deviation is $10.27.

asked 2021-05-14

You are given the sample mean and the population standard deviation. Use this information to construct 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 64 dates, the mean record high daily temperature in the Chicago, Illinois, area has a mean of 84.13∘F. Assume the population standard deviation is 14.56∘F.

asked 2021-05-08

You are given the sample mean and the population standard deviation. Use this information to construct 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 24 months from January 2006 through December 2016, the mean number of tornadoes per month in the United States was about 100. Assume the population standard deviation is 114.