10. Refer to the 95% confidence interval circled on the output. This means:
(a) We are 95% confident that the sample mean egg size in large nests is
between 37 and 40 mm if the survey was repeated.
(b) If the survey was repeated, we are 95% confident that

3. In a random sample of 800 Winnipeg automobile owners, it was found
that 480 would like to see the size of the cars reduced. A 95% confidence
interval for the proportion of all Winnipeg car owners who would like to
see smaller cars is:
(a)
(b)
(c)
(d)
(

(b) We can conclude that the drug was ineffective because those taking
the drug lived, on average, 1.04 years less.
(c) We can conclude that there is no evidence the drug was effective
becaue the 95% confidence interval covers zero.
(d) We can conclude th

(c) If a second sample was taken, there is a 95% chance that its confidence
interval would contain 0.25.
(d) This confidence interval indicates that we would likely reject the hypothesis H: p=0.25.
(e) we are reasonably certain that the true proportion of

(a) 225
(b) 1068
(c) 267
(d) 897
(e) 683
Solution: d
9. A quality control engineer wants to estimate the fraction of defective bulbs
in a large lot of lightbulbs. From past experience, he feels that the actual
fraction of defective bulbs should be somewhe

q
146
10
+
146
15
q
146
10
+
146
15
(d) (6.41 5.20) 2.07
(e) (6.41 5.20) 1.96
Solution: b
Past performance 1990 Dec - 55%
7. An experiment was conducted to compare the efficacies of two drugs in
the prevention of tapeworms in the stomachs of a new breed o

(c) 0.847 0.048
(d) 0.847 0.058
(e) 0.847 0.113
Solution: d
Past performance 1990 Dec - 83%
14. A music buff wants to estimate the percentage of students at the University
of Manitoba who believe that Elvis is still alive. How many students should
he incl