****PLEASE ANSWER ALL QUESTIONS****
Question 7 (1 point)
The owner of a local golf course wants to determine the average
age of the golfers that play on the course in relation to the
average age in the area. According to the most recent census, the
town has an average age of 38.58. In a random sample of 20 golfers
that visited his course, the sample mean was 36.61 and the standard
deviation was 7.505. Using this information, the owner calculated
the confidence interval of (33.71, 39.51) with a confidence level
of 90%. Which of the following statements is the best
conclusion?
Question 7 options:

1)

The average age of all golfers does not significantly differ
from 38.58. 


2)

We are 90% confident that the average age of all golfers that
play on the golf course is greater than 38.58 


3)

We cannot determine the proper interpretation based on the
information given. 


4)

The percentage of golfers with an age greater than 38.58 is
90%. 


5)

We are 90% confident that the average age of all golfers that
play on the golf course is less than 38.58 

Question 8 (1 point)
Independent random samples are taken at a university to compare
the average GPA of seniors to the average GPA of sophomores. Given
a 90% confidence interval for the difference between the true
average GPAs (seniors  sophomores) of (0.05, 0.78), what can you
conclude?
Question 8 options:

1)

We do not have enough information to make a conclusion. 


2)

We are 90% confident that the average GPA of seniors is greater
than the average GPA of sophomores. 


3)

We are 90% confident that the difference between the two sample
GPAs falls within the interval. 


4)

We are 90% confident that the average GPA of seniors is less
than the average GPA of sophomores. 


5)

There is no significant difference between the true average GPA
for seniors and sophomores. 

Question 9 (1 point)
Researchers in the corporate office of an airline wonder if
there is a significant difference between the cost of a flight on
Priceline.com vs. the cost of the same flight on the airline's own
website. A random sample of 8 flights were tracked on Priceline.com
and the airline's website and the mean difference in price
(Priceline.com  Airline Site) was $57.384 with a standard
deviation of $19.2225. Create a 99% confidence interval for the
true average difference in costs between the vendors.
Question 9 options:
Question 10 (1 point)
A USA Today article claims that the proportion of people who
believe global warming is a serious issue is 0.73, but given the
number of people you've talked to about this same issue, you
believe it is greater than 0.73. If you conduct a hypothesis test,
what will the null and alternative hypotheses be?
Question 10 options:

1)

H_{O}: p > 0.73
H_{A}: p ≤ 0.73 


2)

H_{O}: p ≤ 0.73
H_{A}: p > 0.73 


3)

H_{O}: p < 0.73
H_{A}: p ≥ 0.73 


4)

H_{O}: p = 0.73
H_{A}: p ≠ 0.73 


5)

H_{O}: p ≥ 0.73
H_{A}: p < 0.73 

Question 11 (1 point)
A USA Today article claims that the proportion of people who
believe global warming is a serious issue is 0.71, but given the
number of people you've talked to about this same issue, you
believe it is less than 0.71. The hypotheses for this test are Null
Hypothesis: p ≥ 0.71, Alternative Hypothesis: p < 0.71. If you
randomly sample 22 people and 12 of them believe that global
warming is a serious issue, what is your test statistic and
pvalue?
Question 11 options:

1)

Test Statistic: 1.701, PValue: 0.956 


2)

Test Statistic: 1.701, PValue: 0.044 


3)

Test Statistic: 1.701, PValue: 0.044 


4)

Test Statistic: 1.701, PValue: 0.088 


5)

Test Statistic: 1.701, PValue: 0.956 
