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According to a study, several years ago by the Emerson Communications Industry Association, the average wireless phone user earns $ 62,600 per year. Suppose a researcher believes that the average annual earnings of a wireless phone user are lower now, and sets up a study in an attempt to prove his theory. He randomly selects 38 wireless phone users and finds out that the average annual salary for this sample is $58794, with a population standard deviation of $7810. Use α = 0.01 to test the researcher's theory. Assume wages in this industry are normally distributed, determine the 99% confidence interval of the population mean.
If you were designing a study which group, a population or a sample, would you gather data from and why? Provide an explanation regarding whether or not the standard deviation is a biased or unbiased estimate.
Find the probability that number of college students who say they use credit cards because of there wards program is (a) exactly two, (b) more than two.
Assume a one-tailed t -test is being applied to determine if population mean is less than $212. Level of significance chosen is 0.01 and 26 accounts are sampled. Determine the critical value?
Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
Using the .05 level of significance, what should we conclude about the theory that 24 hours is the natural cycle? That is, does the average cycle length under these conditions differ significantly from 24 hours?
Scores by women on the SAT-I test are normally distributed with a mean score of 998 and a standard deviation of 202. scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6 assume the two tests ..
Determine the sample size necessary to estimate a population proportion to within .03 with 90% confidence assuming you have no knowledge of the approximate value of the sample proportion.
The lower limit for a 95% confidence interval for the population proportion if a sample of size 200 had a 40 success is.
Many people believe that abnormal behavior is more likely to occur during a full moon. As a test for empirical evidence to support this belief, a study was conducted based on admission of new clients over a one year period by lunar phases:
Founder of modern probability and statistics theory Cardano asserted that if one throws a die three times the chance that a given number will show at least once is 50 percent. This is now recognized as the wrong answer. Calculate, what is a probab..
Using the p- value approach, test the hypotheses at the 5% level of significance.
The third will be made an offer only if the committee should reject both the first and the second. How many possible ordered choices of three out of six candidates are there?
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