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Five children under twelve are selected at random. The probability that the average number of hours that they spend each week watching television is at least 30 is about:
(a) 32%
(b) 48%
(c) 98%
(d) 20%
(e) 2%
A particular bulb is turned on once each evening for an average of 10 hr. If it is desired to have a reliability of 90 percent, what is its design life in days?
Identify the point estimate of the average number of available hotel rooms in this lesson from each sample. Construct and Interpret a 95% confidence level for the true mean number of available hotel rooms, based on the point estimate of each sampl..
Suppose you wish to test a one-tail hypothesis where you reject H0 only in the lower tail. You calculate ZSTAT = 1.38. What is the statistical decision if you test the null hypothesis at the 0.01 level of significance?
Discuss what happens to the width of the confidence interval as the confidence level is increased. Does this seem reasonable? Explain.
Create the 90% confidence interval for difference in average damage amount for two kinds of SUVs. Interpret this interval.
The height of a tree will be measured using a clinometer. For this device, the measurement error has a normal distribution with mean meter and standard deviation . If the tree is exactly 35 meters tall, what is the probability that the clinometer ..
The lead time is 2 weeks.If you were asked to create an (R,s,S) policy for this, what parameters would you pick? Give your reasons.
Construct a 95% confidence interval for the population mean service charge if a customer's account falls below the $1,500 minimum.
A letter is drawn 1,000 times, at random, from the word A R AB I A. There are two offers. (A) You win a dollar if the number of A's among the draws is10 or more above the expected number. (B) You win a dollar if the number of B's among the drawsis 10..
At a local university, sample of 49 evening students was selected in order to determine whether the average age of evening students is significantly different from 21. The average age of students in the sample was 23 with a standard deviation of 3..
A researcher is interested in estimating noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is required to get the desired information..
Perform a two-sample z-test for proportions to test if men are more likely than women to make online purchases of books.
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