5:49 Done 28 of 30 NODOGA - Outline [ Copy Resize Select Rotate Brushes DODOD GT - Fill Size Color lipboard Image Tools Shapes 11 Use Excel to find the critical value of z for each hypothesis test. (Negative values should be Indicated by a minus sign. Round your answers to 3 decimal places.) (a) 7 percent level of significance, two-talled test Critical value of z (b) 9 percent level of significance, right-talled test Critical value of z ferences (c) 3 percent level of significance. left-talled test. Critical value of z 12 Advertisers fear that users of DVRs (digital video recorders) will "fast forward" past commercials when they watch a recorded program. A leading British pay television company told it's advertisers that this effect might be offset because DVR users watch more TV. A sample of 25 DVR users showed a daily mean screen time of 2 hours and 30 minutes with a standard deviation of 13 minutes, compared with a dally mean of 2 hours and 15 minutes with a standard deviation of 13 minutes for a sample of 25 non-DVR users. inits (a-1) Construct a 90 percent confidence Interval for the difference in mean TV watching. (Round your answers to 2 decimal places.) The 90% confidence Interval is from to 13 Do a two-sample test for equality of means assuming unequal variances. Calculate the p-value using Excel. (a-1) Comparison of GPA for randomly chosen college juniors and seniors: 2 points 21 = 4.25. s, = 20. , - 15. 2 = 4.6. $2 - 30. 2 - 15. a= 025, left-talled test. (Negative values should be indicated by a minus sign. Round down your d.f. answer to the nearest whole number and other answers to 4 decimal places. Do not use "quick" rules for degrees of freedom.) a.f. t-calculated p-value 4-critical (b-1) Comparison of average commute miles for randomly chosen students at two community colleges: 21 = 21. 51 = 5, my - 22, 12 - 28, $2 - 7. n2 - 19. a = 05, two-talled test. (Negative values should be indicated by a minus sign. Round down your dif. answer to the nearest whole number and other answers to 4 decimal places. Do not use "quick" rules for degrees of freedom.) t-calculated p-value 2-critical 10 1914 x 901px Type here to search O Fi w