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A testing bureau reports that the mean for the population of Graduate Record Exam scores is 500 with a standard deviation of 90. The scores are normally distributed.
How do I figure out "The raw score that lies at the 80th percentile?
Suppose that 15% of all adults jog. An opinion poll asks a simple random sample of 500 adults if they jog. What is the sampling proportion in the sample who jog?
Show the decision rule graphically. Use the .05 significance level.
A population of size 1,000,000 claims has mean cycle time of 15 days, and a standard deviation of 4. 100 random samples of each size 64 are selected. What will be the approximate standard deviation of 100 sample means.
your manager who just read an abridged version of a statistics book wants you to test hypotheses for the difference in
When using a t test for dependent means, show the steps involved in calculating the estimated population variance based on scores in this sample:
a professor at a loca community noted that the grades of hi s students were normally distrubuted with a mean of 74
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
question describing data measures of central tendencynbspnbspnbspnbspnbspnbspnbspnbsp number of days from order date to
a random sample of size 100 is taken from an infinite population having the mean mu76 and the standard deviation
Explain clearly what is meant by a false negative rate of 5% and a false positive rate of 15%. If the population were screened, what proportion would be expected to test negative for metropathy?
Describe a political poll or survey. Analyze the number of people who participated in the sample compared to the number in the population and discuss how the results of the survey can be used to tell a story or support an idea of the sponsoring comp..
Use this information to construct a probability table, and then calculate each of the following probabilities:
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