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1.
The time, in hours, that a copying machine may work without breaking down is the normally distributed random variable with mean 549 and the standard deviation 68. Find the probability that the machine will work for at least 500 hours without breaking down - explain your answer (study guide problem 59).
2.
Total annual textbook sales in a certain discipline are normally distributed. 45% of the time, sales are above 671,000 copies, and 10% of the time the sale are above 712,000 copies. Find the mean and the variance of annual sales - explain your answer (study guide problem 72).
Inverse probability based on normal distribution - The data set has a bell-shaped distribution. Between what two prices do 68% of the houses lie?
In order not to violate the requirements necessary to use the chi-square distribution, each expected frequency in a goodness of fit test must be:
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
Suppose a product must go through a sequential assembly line made up of ?ve operations. The time it takes to complete each operation is normally distributed with a mean of 180 seconds and standard deviation of 5 seconds.
The number of items rejected daily by a manufacturer because of defect for the last 30 days are 22, 21, 8, 17, 25, 20, 18, 19, 14, 13, 11, 6, 21, 23, 4, 19, 11, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 9. Complete this frequency table for the..
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
Construct appropriate control charts for before and after introduction of the new pathway. Discuss process stability and the results.
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
Is there a significant difference in mean fetal heart rates by position? Run the test at a 5% level of significance.
Do these data suggest a statistically significance difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance and computed value of 2.37.
Test whether there is a statistical difference between the two proportions at the 5% significance level.
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