Question 6Your answer is INCORRECT.Identify the most appropriate test to use for the following situation:A private and a public university are located in the same city. For the private university, 1046 alumni weresurveyed and 653 said that they attended at least one class reunion. For the public university, 791 out of 1327sampled alumni claimed they have attended at least one class reunion. Is the difference in the sampleproportions statistically significant?
a) Two sample ztest for meansb) Two sample ztest for proportionsc) One sample ttest for meansd) One sample ztest for meanse) Matched pairs ttest for meansf) One sample ztest for proportionsg) Two sample ttest for means
Question 7Your answer is CORRECT.A random sample of 144 cans of fruit nectar is drawn from among all cans produced in a run. Priorexperience has shown that the distribution of the contents has a mean of 11.22 ounces and a standarddeviation of 2.16 ounce. What is the probability that the average contents of the 144 sample cans is less than10.96 ounces?
Question 8Your answer is CORRECT.A random variable Xhas a probability distribution as follows:

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X
0
1
2
3
4
P(
X
)
4
k
2
k
2
k
4
k
2
k
What is P(X < 3)?
a)
b)
c)
d)
e)
Cannot be determined.
Question 9
Your answer is CORRECT.
Find a value of so that
.
a)
b)
c)
d)
e)
Question 10Your answer is CORRECT.The following table displays the results of a sample of 100 in which the subjects indicated their favorite icecream of three listed. The data are organized by favorite ice cream and age group. What is the probabilitythat a person chosen at random will be under 20 years old if he or she favors chocolate?Age Chocolate Vanilla Strawberry Over 40 12 8 20-40 13 9 Under 20 13 19
10
13
3

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- Fall '08
- Staff
- Statistics, Statistical hypothesis testing