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To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of 24.9. Is this a significant difference at α = .05? (a) State the hypotheses for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important? (d) Is it reasonable to assume equal variances? (e) Carry out a formal test for equal variances at α = .05, showing all steps clearly.
How are the goals of the tests similar and different? How are the tests used? What are the purposes of giving these differing tests?
Determine the probability that person's monthly gasoline (gallon) purchases will be less than 67 gallons.
A particular magazine typically has 65% subscription renewals. A new advertising campaign is introduced to see if this can be increased. To monitor renewals, a sample of 300 subscribers is taken each month to see what percentage renew their subscr..
Chance that David would default on his loan based on your knowledge about David. At a cost of about $1000, the bank can investigate and figure out David's complete credit history.
What are some critical decisions involved in selecting an appropriate measurment scale? How might these decisions influence the research design?
Food intake and weight gain. If we increase our food intake, we generally gain weight. Nutrition scientists can calculate the amount of weight gain that would be associated with a given increase in calories.
Find at least what percentage of all homeowners in this city pay a monthly mortgage of 865 to 1,675.00.
Decision rule which chooses alternative associated with smallest maximum opportunity loss is?
However, if they lose the first contract, the president thinks that the probability of winning the second contract decreases to 48%. What is the probability that they win both contracts?
Assuming that all other variables are held constant describe how value of z is influenced by each of the following: If alpha level is changed from a = .05 to a = .01. What occurs to boundaries for the critical regions?
Develop null and alternative hypotheses to help the bank determine which option would provide the best incentive to consumers.
Do the data indicate that the sleeping pill is effective at a 1% level of significance?
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