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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.
if data containing two variables x and y with x as the only predictor variable for y were standardized the slope of a
the nypd precincts in manhattan are numbered from 1 to 34. if the variable precinct is included in a dataset about
Provide a descriptive statistic (to 1 decimal) that could be used to estimate the number of women out of 1000 in this population who have tissue abnormalities.
Does this mean which you can enhance life savings by spending more money? Describe how this correlation is true. How does this apply or could apply to workplace or home?
suppose on your twenty-fifth birthday you opened a retirement account with the howard fund - a fund paying investors 8
what are some of the pitfalls when using regression equations in forecasting the future? be
Suppose this player gets to shoot three free throws. Find the probability that he makes at least one of the three consecutive free throws.
The standard deviation of the sample is 2.5 calls. Using the .05 significance level, can we conclude that the mean number of calls per salesperson per week is more than 44?
suppose that y1 y2 . . . yn denote a random sample from an exponentially distributed population with mean?find the mle
heights of men on a baseball team have a bell shape distribution with a mean of 172cm and a standard deviation of 5cm.
If the bid is accepted , the company will make $36000 minus the cost of the bid. What is the expected value in this situation?
in a survey of 500 u.s. adults 45 of them said that lounging at the beach was their dream vacation assuming this to be
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