Can you do chapter 9?

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11. a. b. z= x − 0 / n 14.15 − 15 = 3/ 50 = −2.00 Because z < 0, p-value is two times the lower tail area Using normal table with z = -2.00: p-value = 2(.0228) = .0456 c. p-value  .05, reject H0 d. Reject H0 if z  -1.96 or z  1.96 -2.00  -1.96, reject H0 17. a. b. H0:  = 24.57 Ha:   24.57 z= x − 0 / n = 23.89 − 24.57 2.4 / 30 = −1.55 Because z < 0, p-value is two times the lower tail area Using normal table with z = -1.55: p-value = 2(.0606) = .1212 c. p-value > .05, do not reject H0. We cannot conclude that the population mean hourly wage for manufacturing workers differs significantly from the population mean of $24.57 for the goodsproducing industries. d. 27. a. b. Reject H0 if z  -1.96 or z  1.96 z = -1.55; cannot reject H0. The conclusion is the same as in part (c). H0:   13.04 Ha:  < 13.04 t= x − 0 s/ n = 12.75 − 13.04 2 / 100 = −1.45 Degrees of freedom = n – 1 = 99 p-value is the lower tail area at the test statistic Using t table: p-value is between .05 and .10 Exact p-value corresponding to t = -1.45 is .0751 c. p-value > .05; do not reject H0. We cannot conclude that the cost of a restaurant meal is significantly cheaper than a comparable meal fixed at home. d. df = 99 t.05 = -1.66 Reject H0 if t  -1.66 -1.45 > -1.66; do not reject H0 34. a. b. H0:  = 2 H a:   2 x= c. s= d. t= xi 22 = = 2.2 n 10  ( xi − x ) 2 n −1 x − 0 s/ n = = .516 2.2 − 2 .516 / 10 = 1.22 Degrees of freedom = n - 1 = 9 Because t > 0, p-value is two times the upper tail area Using t table: area in upper tail is between .10 and .20; therefore, p-value is between .20 and .40. Exact p-value corresponding to t = 1.22 is .2535 e. 41. a. b. p-value > .05; do not reject H0. No reason to change from the 2 hours for cost estimating purposes. H0: p  .53 Ha: p < .53 z= p − p0 p0 (1 − p0 ) n = .46 − .53 .53(1 − .53) 300 = −2.43 p-value is the lower-tail area at the test statistic Using normal table with z = ˗2.43: p-value =.0075 c. p-value   = .01 ; reject H0. We conclude that there has been a statistically significant decline in the proportion of American families owning stocks or stock funds over the ten-year period.
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Awesome! Perfect study aid.

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