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1. At a certain high school, a random sample of 50 student are chosen for a free 10-week SAT prep class They are given a pre-test before the course begins and a post-test after taking the course. The pre-test scores average 1070 with SD 140, the post-test scores average 1210 with SD 157. is there a significant improvement?
2. Suppose the student above are compared with a sample of 50 students who did not take the course. These student also take the test twice in a 10-week interval. The average improvement(2nd score- 1st score) is 81 point with SD 30 points. The average difference for the group which took the course was 140 with an SD of 60. Does the prep course have a significant effect?
If it takes a colony of termites one day to devour a block of wood that is 2 inches wide, 2 inches long, and 2 inches high, then how long will it take them to devour a block of wood that is 4 inches wide,
• A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test of the claim that the proportions of male sm..
a study of the ages of motorcyclists killed in crashes involves the random selection of 159 drivers with a mean of
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
Population is know (from a previous large survey) to be $3000 with the standard deviation of $400. Find the 99% confidence interval for the sample mean.
Furthermore, assume that the standard deviation of the population is $0.14. The value of the test statistic for this hypothesis test and the p-value respectively are?
in each of the following situations the sampling frame does not match the population resulting in undercoverage. give
Consider your study (Terrorism Ideology and Perception of National Security Strategies by local police), conduct a mock power analysis using G*Power. Include the results of your power analysis in a word document. Submit these results along with a bri..
The data show that acreage owned per family is normally distributed with a mean of 10.0 acres and a standard deviation of 1.5 acres. Calculate the percentage of families that own at least 8.1 acres
a small business investment corporation is being formed with enough capital to finance nine independent ventures. the
indicates that the data provides a strong evidence against the null hypothesis. So reject the null hypothesis." - but what is H0 that we are rejecting?
a. give at least two important uses of the moment generating function mgf of an rv.b. could mt 12 e-2t 25 e-t - 25 be
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