9.
Right tailed – 𝞵 is being tested
10.
left tailed – p is being tested
11.
two-tailed – testing 𝜎
12.
right-tailed – testing 𝜌
13.
left-tailed – testing 𝜇
14.
two-tailed – testing 𝜎
15.
Ho: p = .399
H1: p > .399
type 1 error: conclusion that proportion of students who earn a bachelor degree at Joliet is greater than .399 when it is really not. (fasle positive)
type 2 error: conclusion that proportion of studetns who earn a bachelor degree at Joliet is not greater than .399 when it is really greater than. (false negative)
17.
Ho: 𝜇 = $245,700
H1: 𝜇 < $245,700
type 1 error: conclusion that average price of homes in this neighborhood are lower than 245,700 when they are really not.
type 2 error: conclusion that average price of homes in this neighborhood are higher than 245,700 when they are really not.
19.
Ho: 𝜎 = 0.7psi
H1: 𝜎 < 0.7psi
type 1 error: conclusion that the pressure variability is reduced to less than 0.7psi when really it is not below 0.7psi
type 2 error: conclusion that the pressure variability has not been reduced to less than 0.7psi when it actually has been reduced to below 0.7psi
21.
Ho: 𝜇 = $48.79
H1: 𝜇 ≠ $48.79
type 1 error: conclusion that the monthly revenue for each cell phone is not $48.79 when actually it is exactly $48.79
type 2 error: conclusion that the monthly revenue for each cell phone is $48.79 when it is actually not equal to $48.79