9.
right tailed.
10.
left tailed.
11.
two-tailed.
12.
right tailed.
13.
left tailed.
14.
two-tailed.
15.
Ho: p=0.399
H1: p>0.399
Type 1 error would be to conclude that the proportion of students who earn a bachelor’s degree within six years is greater than 0.399, when in fact it is equal to 0.399.
Type II error would be to conclude that the proportion of students who earn a bachelor’s degree within six years isn’t greater than 0.399 when in fact it is.
17.
Ho: μ=$245,700
H1: μ<$245,700
Type I error would be to conclude that the mean price of an existing single-family home is smaller than $245,700, when in fact it is $245,700.
Type II error would be to conclude that the mean price of an existing single-family home is not smaller than $245,700, when in fact it is.
19.
Ho: σ=0.7 psi
H1: σ<0.7 psi
The quality control manager would be committing a type I error by rejecting that the pressure variability is not 0.7 psi when in fact it is.
The quality control manager would be committing a type II error by not rejecting a pressur variability equal to 0.7 psi, when in fact it is smaller.
21.
Ho: μ=$48,79
H1: μ≠$48,79
Type I error would be concluding that the mean monthly cell phone bill is different than $48,79, when in fact it is $48,79.
Type II error would be concluding that the mean monthly cell phone bill is $48,79, when in fact it is different than $48,79.