10.1

9.

Right tailed, u

10.

left tailed, p

11.

two tailed, sigma

12.

right tailed, p

13.

left tailed, u

14.

two tailed, sigma

15.

Ho: .399 H1: p> .399

  1. president concludes the proportion of students who earn a bachelors degree within six years is greater than .399 when it isnt.

  2. the sample evidence leds the president to conlcude the proportion of students who earn a bachelors degree within six years is not greater than .399 when it is

17.

Ho: 245,700

H1: u> 245,700

  1. real estate broker concludes that mean price of existing single family home is lower when it isnt

  2. sample evidence led the real estate broker to conclude that mean price of existing single famly home is not lower when it is.

19.

Ho: .7

H1: sigma> .7

  1. manager rejects hypothesis that variability in pressure required is.7 when the true varability is .7
  2. the quality control manager fails to reject variability in pressure required is .7 when variability is less than .7

21.

Ho: 48.79

H1: u =/48.79

  1. sample evidence led researcher to believe the mean montly cell phone bill is different from 48.79 when it isnt.

  2. did not lead the researcher to believe the mean monthly celll phone bill is different 48.79 when the mean is different.