17. For a normal distribution, two standard deviations on ench side of the mexn

Question

17. For a normal distribution, two standard deviations on ench side of the mexn wou what percentage of the total population? a 47% b.68% C. 95% d. 90% 18.. When o-10, what sample size is needed to specify a 95% confidence interval of t3 units for the mean? (A) 7 (B) 11 (C) 32 D) 43 19. Correction, over-production, inventory, and motion are all examples of get areas c. noise d. value-added activities 20. A process is stable and its output is normally distributed. The process has a specification of 16.73 ± 0.01, what is the maximum process standard deviation if the Cp must be 21.5? (A) 0.0011 (B) 0.0022 (C) 0.0041 (D) 0.0133

Explanation / Answer

Ans17:

Two standards deviations on each side of mean include

95%of the total population

Ans18:

Note that margin error=(Sigma)*z(alpha)÷n

3=(10*1.96)÷n

And this implies that

n=19.6÷3

n=6.53

n=42.64

n~43

Ans19:

Correction,and over production,and inventory are examples of (a)waste

Ans20: process has specification is 16.73+_.01

So 3sigma=.01

Sigma=.01÷3

=.00333

~.0041 correct option c approximately

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