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Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.
If the score of an individual is randomly selected, find the probability that the score will be less than 90.0.
If a random sample of size n = 20 is selected, find the probability that the sample mean will be less than 90.0.
Compute the value of the test statistic. Determine the p-value; and at 93.7% confidence, test the above hypotheses.
Chlorine concentration in a municipal water supply is a uniformly distributed random variable that ranges between 0.74 ppm and 0.98 ppm.
Calculate a sample mean and standard deviation and then reject shipment if the sample average falls below some agree-upon value.
If you draw one ball from the urn what is the probability that it is blue or white?
If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 44.24 tons. Assume that the variable is normally distributed.
Draw a sketch of the standard normal distribution curves, one for the current process and another one for the recentered process. Label the spec limits and shade the area of the curve that corresponds to your answer.
A random sample of 15 Golden Retrievers has an average weight of 66 lb. The percentile rank of this sample is: A.85. B.10. C.90. D.80. E.93.
Can we conclude at a 98% level of confidence, that the mean number of hours per day using the computer by students at IUP is the same as the typical student's usage?
Find the power of the test designed to determine if the the new safety equipment is effective when the mean percent reduction is actually 2.3%. Assume that the population standard deviation is 12% and that α is 0.02. What is the power?
At.01 significance level, is there relationship between job pressure and age?
Test the hypothesis that more than 60 percent of the U.S. senators (of a total 100 senators) favor the president's economic plan, if a sample of 40 showed that 22 favor the plan (use alpha = .05).
74 cashews, and 45 pecans. At the 0.05 level of significance, conduct a nonparametric test that the machine is mixing nuts in the ratio 5:2:2:1.
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