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1. Suppose a 95% confidence interval is computed for u resulting in the interval (112.4, 121.6). Then it would be accurate to say

a. 95% of the time, u falls within the interval (112.4, 121.6)

b. There is a 95% chance that u will fall within the interval (112.4, 121.6)

c. We are 95% confident the interval (112.4, 121.6), captures u.

d. 95% of all the possible values for u fall within the interval (112.4, 121.6)

2. A piece of clothing takes an average of 38 minutes to move through an assembly line. If the standard deviation is 4 minutes, and the distributiion is normal, what is the probability that a piece of clothing will take over 45 minutes?

a. .040

b. .080

c. .175

d. .227

3. Suppose the random variable X has a normal distribution with a mean of 9.0 and variance of 49. The probability of X takes on a value of no more than 18 is approximately equal to

a. .0993

b. .4015

c. .9007

d. none of the answers

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91014467

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