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it is found that the standard deviation of the diameters of rivets produced by a certain machine over a long period of time is 0.018 cm. The diameters of a random sample of 100 rivets produced by this machine in a day have a mean value of 0.476 cm. If the machine produces 2500 rivets a day, determine (a) the 90% confidence limits, and (b) the 97% confidence limits for an estimate of the mean diameter of all the rivets produced by the machine in a day.
In an evaluation of the medical lab, the manager is interested in the efficiency of three technicians when they process four routine blood tests.
Sampling seventy-two percent of americans squeeze their toothpaste tube from the top. This and other not so serious finding are included in The first really important survey of american habits.
They plan to set up a radar trap and check the speeds of 80 randomly selected cars. Can this distribution be approximated by a normal curve?
A nutritionist conducted an experiment on memory for dreams. She wanted to test whether it really was true that eating cheese before going to bed made you have bad dreams. Over three nights, the nutritionist fed people different foods before bed.
A plus four 95% confidence interval for the difference between the two population proportions of wrist injuries is: A. 0.2909 ± 0.1674. B. 0.2909 ± 0.1069. C. 0.2909 ± 0.0907. D. 0.2909 ± 0.1275
Which of the following statements isn't a property of the normal probability distribution? Please explain briefly why
Develop a p chart with 3-sigma control limits and evaluate whether the process is in statistical control
An anatomy teacher hypothesizes that the final grades in her class are distributed as 10% A's, 23% B's, 45% C's, 14% D's, and 8% F's. At the end of the semester, she has the following grades.
Research by the Illinois Banking Company revealed that only 10 percent of their customers wait more than five minutes to do their banking. Management considers this reasonable and will not add more tellers unless the proportion becomes larger than..
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
In the boom years of the late 1990s, it was often said that rapidly increasing stock prices were responsible for much of the rapid growth of real GDP. Explain how this could be true, using aggregate demand and aggregate supply analysis
Mr. Smith had 11 stocks that averaged 11.3 percent with a standard deviation of 3.2 percent. At the .02 level of significance, can we conclude that Mr. Jones' stocks have a different variation?
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