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The mean length of a work week for the population of workers was reported to be 39.2 hours. Suppose that we would like to take a current sample of workers to see whether the mean length of a work week has changed from the previously reported 39.2 hours.
A. State the hypotheses that will help us determine whether a change occurred in the mean length of a work week.
B. Suppose a current sample of 112 workers provided a sample mean of 38.5 hours. Use a population standard deviation = 4.8 hours. What is the p-value?
C. At a = .05 can the null hypothesis be rejected? What is your conclusion?
D. Repeat the preceding hypothesis test using the critical value approach.
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Using the 0.01 level of significance, is there evidence that the mean shopping time at the supermarket is different from the claimed value of 22 minutes?
The following sample data shows the quarterly earnings in millions for two US companies. Your research interest is finding if the average earnings for these companies are different.
A standard slot machine has three reels. The first reel has 3 walnuts, 7 cherries, 3 oranges, 5 lemons, 1 bell, and 1 jackpot bar. The second reel has 7 cherries, 6 oranges, 1 lemon, 3 bells, and 3 bars. The third reel has 4 walnuts, 7 oranges, 5 ..
Examine the relationship between final grade and the reported hours per week each student said they studied for the course. Do we have evidence that females are being discriminated against?
What happens to the boundaries for the critical regions?
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Suppose in fact that 47% of the population favors this idea. Use the normal distribution to calculate the probability that at least half of the sample are in favor.
What is the probability that an individuals clotting time will be more than 3 seconds and less than 11? Assume a normal distribution
What are confounds? Give an example of a design that has three confounds. Describe three ways to alter the design to address these confounds and explain the advantages and disadvantages of each.
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