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(a) A student is planning for his final year project sample size for determining the electricity consumption for a dryer. The electricity consumption is assuming to be normally distributed with standard deviation of 150 kw. How large sample must be selected if he wants 98% of finding whether the true mean differ from the sample mean by 50kW.

(a) A student is planning for his final year project sample size for determining the electricity consumption for a dryer. The electricity consumption is assuming to be normally distributed with standard deviation of 150 kw. How large sample must be selected if he wants 98% of finding whether the true mean differ from the sample mean by 50kW.

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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5 (a) A student is planning for his final year project sample size for determining the electricity consumption for a dryer. The electricity consumption is assuming to be normally distributed with standard deviation of 150 kW. How large sample must be selected if he wants 98% of finding whether the true mean differ from the sample mean by 50kW. (b) A researcher wants to compare the effect of several method on gold plating. For the first method, the printed circuit edge connecters were gold plated with control immersion tip plating. While for the second method, it was plated with total immersion plating before it was masked. 7 printed circuit edge connectors were chosen for the first method and five connectors were masked in the second method, had mean of gold thickness was 1.5 um and 1.0 µum, respectively. For standard deviation, both samples have 0.25 µm and 0.15 µm, respectively. Construct a 99% confidence interval for the difference between the mean of gold thicknesses produced by the two methods. (c) A researcher wishes to claim that the average final examination mark of Manufacturing Technology is different than 80. He selects a sample of 25 students and find the mean of the sample is 79, with a standard deviation of 4 marks. Is there any evidence to support this claim, if a = 0.1.
Transcribed Image Text:5 (a) A student is planning for his final year project sample size for determining the electricity consumption for a dryer. The electricity consumption is assuming to be normally distributed with standard deviation of 150 kW. How large sample must be selected if he wants 98% of finding whether the true mean differ from the sample mean by 50kW. (b) A researcher wants to compare the effect of several method on gold plating. For the first method, the printed circuit edge connecters were gold plated with control immersion tip plating. While for the second method, it was plated with total immersion plating before it was masked. 7 printed circuit edge connectors were chosen for the first method and five connectors were masked in the second method, had mean of gold thickness was 1.5 um and 1.0 µum, respectively. For standard deviation, both samples have 0.25 µm and 0.15 µm, respectively. Construct a 99% confidence interval for the difference between the mean of gold thicknesses produced by the two methods. (c) A researcher wishes to claim that the average final examination mark of Manufacturing Technology is different than 80. He selects a sample of 25 students and find the mean of the sample is 79, with a standard deviation of 4 marks. Is there any evidence to support this claim, if a = 0.1.
J Murdoch and JA Barnes Statistical Tables for Science. Engineering. Management and Business Studies Third edition 1-(u) Revised and Expanded Statistical Tables for Science, Engineering, Management and Business Studies J. Murdoch B., A.R.T.C., A.M.LProd.E. De f Menment Selence Sdn J.A.Barnes B.e., AR.C.S. Sener Lerer Thnd Aeved and epanded Maapm Science Sude Cuf unf Tetk
Transcribed Image Text:J Murdoch and JA Barnes Statistical Tables for Science. Engineering. Management and Business Studies Third edition 1-(u) Revised and Expanded Statistical Tables for Science, Engineering, Management and Business Studies J. Murdoch B., A.R.T.C., A.M.LProd.E. De f Menment Selence Sdn J.A.Barnes B.e., AR.C.S. Sener Lerer Thnd Aeved and epanded Maapm Science Sude Cuf unf Tetk
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