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test 1 2012

# test 1 2012 - Question 1 of 28 4.0 Points Pretend you are...

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Question 1 of 28 4.0 Points Pretend you are in charge of a packaging equipment company that is filling boxes of cereal. From past experience we know the population’s mean weight of the filled boxes is 300 grams (and we know the distribution of grams is approximately normal). The population standard deviation is given as 12 grams. You are told to randomly select a sample of 36 boxes. You need to determine the probability that the sample of the 36 boxes will have a sample mean above 303. The probability will be between… A. 0 and .010 B. .011 and .043 C. .044 and .150 D. .151 and .222 E. .223 and 1.0 Reset Selection Question 2 of 28 4.0 Points Determine the probability that a sample of 25 widgets will have a mean weight between 399 grams and 403 grams. Past records show that the population mean is 400 grams and the population standard deviation is 10. There will be ____________ probability that the sample is between 399 and 403. Select the closest possible answer to fill in the blank above. Reset Selection Question 3 of 28 4.0 Points

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If we had a study that involved 1,000 observations and we made a 95% confidence interval, how many observations would we expect to have outside of the range of our interval? Reset Selection Question 4 of 28 4.0 Points Let’s say we know the population standard deviation and we are asked to create an 80% confidence interval. Which value most accurately represents the critical value of Z that you would use to plug in for your interval? Reset Selection Question 5 of 28 4.0 Points Let’s say we don’t know the population standard deviation and we are asked to create a 95% confidence interval. Our sample size is 15. Which value most accurately represents the critical value of “t” that you would use to plug in for your interval? A. 2.160
B. 2.145 C. 1.753 D. 1.761 E. 2.998 Reset Selection

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