Assume the sample is from a normally distributed population and construct the indicated confidence intervals for (a) the population variance \(\sigma\);2 and (b) the population standard deviation\(\sigma\);. Interpret the results. The acceleration times (in seconds) from 0 to 60 miles per hour for 33 randomly selected sedans are listed. Use a 98% level of confidence. 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

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Assume the sample is from a normally distributed population and construct the indicated confidence intervals for (a) the population variance \(\displaystyle\sigma^{{{2}}}\) and (b) the population standard deviation \(\displaystyle\sigma\). Interpret the results. The maximum wind speeds (in knots) of 13 randomly selected hurricanes that have hit the U.S. mainland are listed. Use a 95% level of confidence. \(\begin{matrix} 70 & 85 & 70 & 75 & 100 & 100 & 110 & 105 & 130 & 75 & 85 & 75 & 70 \end{matrix}\)

Assume the sample is from a normally distributed population and construct the indicated confidence intervals for (a) the population variance \(\displaystyleσ^{{{2}}}\) and (b) the population standard deviation σσ. Interpret the results. The diameters (in inches) of 18 randomly selected bolts produced by a machine are listed. Use a 95% level of confidence. 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

Assume the sample is from a normally distributed population and construct the indicated confidence intervals for (a) the population variance \(\displaystyleσ^{{{2}}}\) and (b) the population standard deviation σ. Interpret the results. The record high daily temperatures (in degrees Fahrenheit) of a random sample of 64 days of the year in Grand Junction, Colorado, have a sample standard deviation of 16.8∘F. Use a 98% level of confidence.

Assume the sample is from a normally distributed population and construct the indicated confidence intervals for (a) the population variance \(\displaystyle\sigma^{{{2}}}\) and (b) the population standard deviation \(\displaystyle\sigma\). Interpret the results. The numbers of touchdowns scored by 11 randomly selected NCAA Division I Subdivision teams in a recent season have a sample standard deviation of 9.35. Use an 80% level of confidence.