9.
right-tailed, mean
10.
Type answer here.
11.
two-taield, sigma
12.
right-tailed, p
13.
left-tailed, mean
14.
two-tailed, sigma
15. (a) Ho:p=0.399
H1:p>0.399 (b) Making a type I error would mean concluding that the proportion of students who enroll in Joliet Junior College and earn a bachelor’s degree within six years is greater than 0.399 when, in fact, the proportion of studnets who enroll in Joliet Junior College and earn a bachelor’s degree within six years is not greater than 0.399. (c) Making a type II error would mean concluding that the proportion of students who enroll in Joliet Junior College and earn a bachelor’s degree within six years is not greater than 0.399 when, in fact, the proportion of students who enroll in Joliet College and earn a bachelor’s degree within six years is greater than 0.399.
17. (a)
Ho:mean=$245,700
H1:mean<$245,700 (b) Making a type I error would be that the existing home prices in the broker’s neightborhood are lower than $245,700 when, in fact, the existing home prices in the broker’s neighborhood are not lower than $245,700. (c) Making a type II error would be that the existing home prices in the broker’s neighborhood are not lower than $245,700 when, in fact, the existing home prices in the broker’s neighborhood are lower than $245,700.
19. (a) Ho:sigma=0.7psi
H1:sigma< 0.7psi (b) Making a type I error would mean that the pressure variability has been reduced below 0.7psi when, in fact, the pressure variability has not been reduced below 0.7psi. (c) Making a type II error would mean that the pressure variability has not been reduced below 0.7psi when, in fact, the pressure variability has been reduced below 0.7psi.
21. (a) Ho: mean=$48.79
H1: mean not equals to $48.79 (b) Making a type I error would mean concluding that the mena monthly revenue per cell phone is not $48.79 when, in fact, the mean monthly revenue per cell phone is $48.79. (c) Making a type II error would mean concluding that mean monthly revenue per cell phone is $48.79 when, in fact, the mean monthly revenue per cell phone is not $48.79.