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1. A torque wrench used in the final assembly of cyl- inder heads has a process standard deviation of 5.0 lb-ft. The engineers have specified that a process average of 135 lb-ft is desirable. For a simple random sample of 30 nuts that the machine has recently tightened, the sam- ple mean is 137.0 lb-ft. Construct and interpret the 95% confidence interval for the current process mean. Discuss the possibility that the machine may be in need of adjustment to correct the process mean.
2. There are approximately 113 million television households in the United States. A ratings service would like to know, within 5 percentage points and with 95% confidence, the percentage of these house- holds who tune in to the first episode of a network miniseries. How many television households must be included in the sample? Source: The World Almanac and Book of Facts 2009, p. 291.
In studying the performance of the comapany's stock investments over the past year, the research manager of a mutual fund company finds that only 43% of the stocks returned more than the rate that had been expected at the beginning of the year.
543 people were selected at random from a large population. 505 of them said they had the internet installed on their
control chart for x bar is maintained on a quality characteristic which is normally distributed.the sample size is n4.
The average age of statistics students nationwide is 22. The standard deviation is 2.5 years. Assume the age is a normally distributed variable. Find the probability that one student selected at random is older than 23.
the diameter of ball bearings produced in a manufacturing process can be explained using a uniformprobability
in a game of chance a number of draws are made with replacement from a box of tickets 500 of these tickets are labeled
The number of stereos sold on each weekday. State the hypotheses and identify the claim, find the critical value(s), compute the test value, make the decision and summarize the results.
Determine whether a marketing campaign to increase spending at a direct marketing retailer has resulted in incremental spend. For this campaign, I have two groups: Test and Control. I mail 75,000 customers (Test group) offering them rewards if they s..
In estimating a 95% confidence interval estimate of the average number of days absent for the company's workers last year should you use a z or t value in the formula?
each day a large animal clinic schedules 10 horses to be tested for a common respiratory disease. the cost of each test
a draw thenbspscatter plotnbspfor the variables.b compute thenbspcorrelation coefficient. usenbspthree
a distribution with m35 and a standard deviation 8 is being standardized so that the new mean and standard deviation
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