9.
Right tailed, mean
10.
Left-tailed, probability
11.
Two-tailed, standard deviation
12.
Right-tailed, probability
13.
Left-tailed, mean
14.
Two-tailed, standard deviation
15.
Ho: p = 0.399
H1: p > 0.399
The sample evidence leads the president to conclude the proportion of students who earn a bachelor’s degree within 6 years is greater than 0.399, when in fact the proportion is 0.399
The sample evidence leads the president to conclude the proportion of students who earn a bachelor’s degree within 6 years isn’t greater than 0.399, when in fact the proportion is greater than 0.399
17.
Ho: mean = 245,700
H1: mean < 245,700
The sample evidence led the real estate broker to conclude the mean price of an existing single-family home is lower in her neighborhood , when in fact the mean price is not lower
The sample evidence led the real estate broker to conclude the mean price of an existing single-family home isn’t lower in her neighborhood , when in fact the mean price is lower
19.
Ho: standard deviation = 0.7
H1: standard deviation < 0.7
The quality-control manager rejects the hypothesis that the variability in the pressure required is 0,7 psi, when the true variability is 0.7 psi
The quality-control manager fails to reject that the variability in the pressure required is 0,7 psi, when the true variability is less than 0.7 psi
21.
Ho: mean = 48.79
H1: mean isn’t equal to 48.79
The sample evidence led the researcher to believe the mean monthly cell phone bill is different from 48.79, when in fact the mean bill is 48.79
The sample evidence didn’t lead the researcher to believe the mean monthly cell phone bill is different from 48.79, when in fact the mean bill is different from 48.79