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1. Test Ho: µ =100; H1: µ < 100, using n = 36 and alpha = .05 If the sample mean = 95 and the sample standard deviation = 10, which of the following is true?
2. Assume that the population variance is unknown. We test the hypothesis that Ho: µ=5 against the alternative that it is not at a level of significance of 5% and a sample size of n=151. We calculate a test statistic = -1.976. The p-value of this hypothesis test is approximately
3. A taxi company is interested in the amount of time its vehicles are out of operation for repair. Find a 95% confidence interval for the mean number of days in a month that all taxis are out of operation for repair. A random sample of nine taxis had the following number of days that each was in repair (Note that we are using sample data and must estimate the sample standard deviation using the sample formula.):
10 16 19 14 19 21 22 8 17
4. A professor found that the historical scores on on the final exams follow a normal distribution with a A random sample of nine test scores from the current class had a mean score of 187.9 points and a sample standard deviation of 32.4 points. Find the 98% confidence interval for the population mean score of the current class.
statistics - degrees of freedom independent two sample test?a independent two-sample test with n134 and n242 would have
For a sample of 100 employees, a personnel direc- tor has collected data on x 5 the number of years an employee has been with the firm and y 5 the number of shares of company stock the employee owns. The data are in file XR02044. a. Generate a scatte..
for the following managerial dilemmas formulate a research problem and plan the findings of which will aid the decision
Suppose a statistician chose to test a hypothesis at sigma = 0.01. The critical value for a right-tailed test is +2.33. If the test value were 1.97, what would the decision be?
instructionsyour comments should add significantly to the discussion by suggesting alternative solutions pointing out
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A random variable is binomially distributed with n = 16 and π = .40. The expected value and standard deviation - find the sample size to estimate the mean with an error of ± 4 and 95 percent confidence (rounded to the next higher integer).
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for a distribution of scores x40 corresponds to a z-score of z -1.00 and x 42 corresponds to a z-score of z -.50. what
Florida Company (FC) and Minnesota Company (MC) are both service companies. - What is the standard deviation of the portfolio with 50% of the funds invested in FC and 50% in MC?
Is the Euro fair? Soon after the Euro was introduced as currency in Europe, it was widely reported that someone had spun a Euro coin 250 times and gotten heads.
Someone gives you 10 to 1 odds that you cannot roll a double number with the roll of a pair of dice. You win $10 if you succeed and you lose $1 if you fail. What is the expected value of the game for you? What can be expected if you play 100 times..
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