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A financial planner wants to compare the yield of income and growth mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income and 40 growth funds. The mean increase for a two-year period for the income funds is $900. For the growth funds the mean increase is $875. Income funds have a sample standard deviation of $35; growth funds have a sample standard deviation of $45. Assume that the population standard deviations are equal. At the 0.05 significance level, is there a difference in the mean yields of the two funds?
Does drug have significant effect on aggression? Use an alpha level of .05, two tails.
What is an appropriate sample space for this experiment?
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
Your workplace reduces all workplace scores on particular employee aptitude test in z-scores which are placed in district-wide distribution of scores.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
Choose the correct answer using sum of squared error (SSE).
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
How large sample size must be taken to be 95% confident.
A medical research project examined the relationship between the subject's weight and recovery time from surgical procedure, as shown in the table below.
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
Using the p- value approach, test the hypotheses at the 5% level of significance.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
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