Key to the Practice Final

Problem 1

A.  viii    B.  vii    C.  xiv    D.  iii    E.  xiii    F.  xii    G.  i    H.  xi

Problem 2

C² = 5.3 < 6.25 hence there is insufficient evidence to suggest that color is a factor in the decision process.

Problem 3

A.  H₀:  m = 25, H_a:  m > 25

B.  We end up with a surplus of computers.

C.  We run out of computers and get fired.

D.  a = .2 (a high number) since we do not want a type II error.

E.  93 computers

Problem 4

t = 1.02 hence fail to reject so there is insufficient evidence to suggest that taking a summer class is more difficult than a fall class.

Problem 5

A.  19.077 - .549x

B.  74

C.  p =.013 < .05 so reject the null hypothesis and accept the alternative hypothesis and conclude that there is sufficient evidence to say that the line is useful.