1a) Stock Prices A random sample of stock prices per share (in dollars) is shown. Find the 95% confidence intervals for the variance and standard deviation for the prices. Assume the variable is normally distributed. Round the sample variance and final answers to three decimal places. 28.37 13.88 26.69 14.75 46.12 10.87 40.25 60.50 28.00 28.25 6.94 45.12 ___ < σ2 <___ ___ < σ <___ 1b) Home Ownership Rates The percentage rates of homeownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of homeownership with 99% confidence. Round the sample variance and the final answers to two decimal places. 73.8 69.4 74.5 60.1 67.6 71.8 47.2 76.8 ___ < σ2 <___ ___ < σ <___ 1c) SAT Scores Estimate the variance in mean mathematics SAT scores by state, using the randomly selected scores listed below. Estimate with 95% confidence. Assume the variable is normally distributed. Round the sample variance and final answers to one decimal place. 543 565 211 499 550 209 502 469 490 572 ___ < σ2 <___
1a) Stock Prices A random sample of stock prices per share (in dollars) is shown. Find the 95% confidence intervals for the variance and standard deviation for the prices. Assume the variable is
28.37
|
13.88
|
26.69
|
14.75
|
46.12
|
10.87
|
40.25
|
60.50
|
28.00
|
28.25
|
6.94
|
45.12
|
___ < σ <___
1b)
Home Ownership Rates The percentage rates of homeownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of homeownership with 99% confidence. Round the sample variance and the final answers to two decimal places.
73.8
|
69.4
|
74.5
|
60.1
|
67.6
|
71.8
|
47.2
|
76.8
|
___ < σ <___
1c) SAT Scores Estimate the variance in mean mathematics SAT scores by state, using the randomly selected scores listed below. Estimate with 95% confidence. Assume the variable is normally distributed. Round the sample variance and final answers to one decimal place.
543
|
565
|
211
|
499
|
550
|
209
|
502
|
469
|
490
|
572
|
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