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ANTHONY R D
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about standard deviation? 1st question-A large software company gives applicants a test of programming ability and the mean for that test has been 160 in the past. Twenty-five job applicants are randomly selected from one large university and they produce a mean score of 162 with a standard deviation of 7.4. Using a 0.10 significance level, test the claim that this sample comes from a population with a mean score greater than 160. Need the null hyp. alt. hyp, decision, rejection region.
2nd Q- The standard deviation of math test scores at a high school is 15.8. A teacher claims that the standard deviation of the girls' test scores is smaller than 15.8. A random sample of 25 girls' results in scores with a standard deviation of 13. Use 0.10 level of significance, test the claim that the girls have a standard deviation lower than 15.8. Need the null hyp, alt. hyp, decision, please show me how you came up with the answer. Thank you!!!
2nd Q- The standard deviation of math test scores at a high school is 15.8. A teacher claims that the standard deviation of the girls' test scores is smaller than 15.8. A random sample of 25 girls' results in scores with a standard deviation of 13. Use 0.10 level of significance, test the claim that the girls have a standard deviation lower than 15.8. Need the null hyp, alt. hyp, decision, please show me how you came up with the answer. Thank you!!!