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Test the given problem using independent sample t -test.
A school district wants to determine if the girls are equal to boys in test scores. They took a random sample of 22 8th grade girls and 24 8th grade boys. The district looked at recent CAT scores and found the mean score for girls to be xbar1 = 25 and the mean score for boys to be xbar2 = 26. The standard deviation for the girls is s1 = 2.2 and for the boys the standard deviation is s2 = 3.4. Is the school district correct in assuming the girls are equal in performance to boys. They are 95% sure their assumption is correct.
Verify value of t for the independent Variable, using formula. (That is, using formula in the Formula Sheet compute the t statistic , given data provided in the print out).
A point estimate for the difference between the mean purchases of the users of the two credit cards is:
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
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Confirm that these statements are accurate by finding the geometric mean rate of increase.
Assume you choose 20 houses at random. On average, how many houses of twenty would you expect to have DVD? Determine standard deviation of number of houses with DVD?
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
Determine the following:Mean, Median and Variance.
Explain your answer to someone who is familiar with the T test for a single sample, but not with the T test independent means.
If the computed value for this problem is +2.33, and the level of significance is 0.05, can we conclude that the recall proportions for the two commercials are same?
What can we conclude from this summary, Which of the following statements is correct and In which of the following situations would permutation tests be suitable
Would the method described above be a good way to determine which team was taller (explain why or why not)?
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