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A random sample of 400 households from a large community was selected to estimate the Questions 8–9. mean electricity use per household during February 2001. Another random sample of 400 households was selected, independent of the first, to estimate the mean electricity use during February 2002. The sample results (in kilowatt hours) were as follows: Std Dev 200 Year Sample Size Mean 2001 1 400 1300 2002 400 1330 210 8. A 95% confidence interval for the difference in mean electricity use between the two years is closest to (b) – 30±23.8525 (e) – 30±25.6142 (c) – 30±24.3213 (a) – 30±33.785 V(d) – 30±28.42 To test if the mean electricity use per household has changed between the two years, the p-value is closest to 9. (а) 0.0192 (b) 0.0152 V(c) 0.0384 (d) 0.05 (е) 0.0673

A random sample of 400 households from a large community was selected to estimate the Questions 8–9. mean electricity use per household during February 2001. Another random sample of 400 households was selected, independent of the first, to estimate the mean electricity use during February 2002. The sample results (in kilowatt hours) were as follows: Std Dev 200 Year Sample Size Mean 2001 1 400 1300 2002 400 1330 210 8. A 95% confidence interval for the difference in mean electricity use between the two years is closest to (b) – 30±23.8525 (e) – 30±25.6142 (c) – 30±24.3213 (a) – 30±33.785 V(d) – 30±28.42 To test if the mean electricity use per household has changed between the two years, the p-value is closest to 9. (а) 0.0192 (b) 0.0152 V(c) 0.0384 (d) 0.05 (е) 0.0673

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Questions 8–9. A random sample of 400 households from a large community was selected to estimate the mean electricity use per household during February 2001. Another random sample of 400 households was selected, independent of the first, to estimate the mean electricity use during February 2002. The sample results (in kilowatt hours) were as follows: Sample Std Dev 200 Year Size Mean 2001 1 400 1300 2002 2 400 1330 210 8. A 95% confidence interval for the difference in mean electricity use between the two years is closest to (а) — 30 + 33.785 V(d) – 30+28.42 (b) – 30±23.8525 (e) – 30±25.6142 (с) — 30+ 24.3213 9. To test if the mean electricity use per household has changed between the two years, the p-value is closest to (a) 0.0192 (b) 0.0152 V(c) 0.0384 (d) 0.05 (e) 0.0673
Transcribed Image Text:Questions 8–9. A random sample of 400 households from a large community was selected to estimate the mean electricity use per household during February 2001. Another random sample of 400 households was selected, independent of the first, to estimate the mean electricity use during February 2002. The sample results (in kilowatt hours) were as follows: Sample Std Dev 200 Year Size Mean 2001 1 400 1300 2002 2 400 1330 210 8. A 95% confidence interval for the difference in mean electricity use between the two years is closest to (а) — 30 + 33.785 V(d) – 30+28.42 (b) – 30±23.8525 (e) – 30±25.6142 (с) — 30+ 24.3213 9. To test if the mean electricity use per household has changed between the two years, the p-value is closest to (a) 0.0192 (b) 0.0152 V(c) 0.0384 (d) 0.05 (e) 0.0673
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