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John Rengel is the Quality Assurance Supervisor for Vino Supremo Vinyards. He knows that 10 percent of each box of corks is undersized.
a) If he were to randomly select 120 corks from the next box, then how many of these corks would John expect to be undersized?
b) If he were to randomly select 120 corks from each box, then what would John calculate as the standard error of the number of undersized corks?
c) What is the probability that John will find 15 or more corks defective in a randomly selected box?
Ball bearings are manufactured with a diameter of 5 mm. But the process has variation, so the diameter is normally distributed with a mean of 5 mm and a standard deviation of .02 mm. A) What proportion of ball bearings are more than 5.03 mm?
Compute a 5-month moving average forecast for June through January.
The table given below shows joint probability distribution of X and Y . Determine the covariance between the X and Y ?
Construct a 99% confidence interval estimate of the population proportion of accounts that would purchase the additional line if the handset were free.
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
Banner Mattress and Furniture Company wishes to study the number of credit applications received per day for the last 300 days.
You have 4 jars. In the largest jar you have three balls numbered 1 to 3. Then you have 3 colored jars. Jar 1 has a red ball and two orange balls.
Do the data indicate a significant difference? Test with ∝ = .05.
At a 0.05 level of significance, does this data show that 2 year college students and private unversity students work an equivalent amount of time?
Which of the following is a major difference between the binomial and the hypergeometric distributions?
Assuming that a difference (Δ) of 2 lbs. in the mean was important to detect, a maximum Type I Error (α) level of 5%, and the desire to run a two-tailed test, then:
Test whether the average cycle of sleeping and waking differs significantly from 24 hours.
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