of the proportion of voters who will vote for each candidate). They intend to use a 95% confidence
interval with margin of error of no more than 2.5%. What is the minimum sample size needed to
accomplish this goal?
a. 1536
b. 39
c. 1537
d. 40
e. 2653
A sample of size 35 is to be drawn from a large population. The sampling technique is such that
every possible sample of size 35 that could be drawn from the population is equally likely. What
name is given to this type of sample?
a. Systematic sample
b. Cluster sample
c. Voluntary response sample
d. Random sample
e. Simple random sample
A teacher’s union and a school district are negotiating salaries for the coming year. The teachers
want more money, and the district, claiming, as always, budget constraints, wants to pay as little as
possible. The district, like most, has a large number of moderately paid teachers and a few highly
paid administrators. The salaries of all teachers and administrators are included in trying to figure
out, on average, how much the professional staff currently earn. Which of the following would the
teachers’ union be most likely to quote during negotiations?
a. The mean of all the salaries.
b. The mode of all the salaries.
c. The standard deviation of all the salaries.
d. The interquartile range of all the salaries.
e. The median of all the salaries.
Alfred and Ben don’t know each other but are each considering asking the lovely Charlene to the
school prom. The probability that at least one of them will ask her is 0.72. The probability that they
both ask her is 0.18. The probability that Alfred asks her is 0.6. What is the probability that Ben asks
Charlene to the prom?
a. 0.78
b. 0.30
c. 0.24
d. 0.48
e. 0.54
A significance test of the hypothesis H 0 : p = 0.3 against the alternative H (^) A : p > 0.3 found a value
of = 0.35 for a random sample of size 95. What is the P -value of this test?
a. 1.06
b. 0.1446
c. 0.2275