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Unformatted text preview: confidence interval for the mean SAT Verbal score for the population of all seniors in the district. a. Using the above data, the critical value has how many degrees of freedom? b. What is the critical value for the 90% confidence interval? c. Find the 90% confidence interval. d. Suppose the population of all high school seniors has a mean score of 450. We wish to see if the data provide evidence that the mean score of seniors is larger than 450. Write the hypotheses for this test. e. Carry out the appropriate test of significance at the 5% level and write your conclusions. ESSAY SUBMISSION ESSAY FEEDBACK a) This is n-1 b) Use invT(proportion,df) c) Try this again with the corrected value from b. d) Please state you Ho and Ha e) First be sure to comment on the conditions for the procedure. Then find t: t = (x-bar - )...
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- Spring '11