Question 1
The t table is used when the population standard deviation is known and the z tables is used when the population standard deviation is not known.
Select one:
True
False
Question 2
Question text
If alpha is .05 what is the significance level (input as a decimal with two significant digits e.g. .14 instead of 14% or 14)?
Answer:
Information text
Please refer to the following to answer the questions below.
The owner of Limp Pines Resort wants to know if the average age of its clients has changed in the past decade. Prior research (10 years ago) showed that the population mean was 53 years old with a population standard deviation of 9 years. A random sample of 70 clients is taken. It shows a mean age of 48 years. Perform a hypothesis test at a .1 significance level to see whether there is enough evidence to say that the mean age of clients has changed?
Question 3
Question text
Which of the following is the alternative hypothesis?
Select one:
a. µ ≠ 53
. µ = 53
c. µ < 53
d. µ > 53
Question 4
Question text
In this case is it appropriate to calculate a z or t value?
Select one:
a. z
. t
Question 5
Question text
Is this a one sided or two sided test? And, therefore, what is the z critical value to look up?
Select one:
a. Two sided, zalpha/2
. One sided, zalpha
c. One sided, zalpha/2
d. Two sided, zalpha
Question 6
Question text
What is the value of the appropriately calculated z or t value (the value calculated using the appropriate z or t formula, not the critical value from the table; input as a number with two significant digits e.g. 3.14)?
Answer:
Question 7
Question text
What is the appropriate z or t critical value (obtained from the table or by using excel)?
Select one:
a. .05
. 1.96
c. .95
d. 1.645
Question 8
Question text
What is the appropriate conclusion from this test?
Select one:
a. Reject the null, at a 10% significance level we conclude that the mean age has not changed in the past decade.
. Do not reject the null, at a 10% significance level we conclude that the mean age has changed in the past decade.
c. Do not reject the null, at a 10% significance level we conclude that the mean age has not changed in the past decade.
d. Reject the null, at a 10% significance level we conclude that the mean age has changed in the past decade.
Information
Flag question
Information text
Historically, 45% of guests at your resort use at least one item from the mini-bar. In order to increase sales of mini-bar items, you tested having your desk clerks politely remind guests that the items are available. During the experiment, you took a randomly sample of 360 guest stays and found that 160 of the guests had used at least one item from the mini-bar. Is there enough evidence (at a .1 significance level) to say that the proportion of guests using the mini-bar has increased as a result of the test?:
Question 9
Question text
What is the alternative hypothesis?
Select one:
a. p ≠ .45
. p = .45
c. p > .45
d. p < .45
Question 10
Question text
Would you use a t or z critical value to perform a hypothesis test?
Select one:
a. t
. z
Question 11
Question text
Which of the following can you conclude from the test?
Select one:
a. At a .05% significance, we can not reject the null and say that the test worked. Therefore, we should stop reminding people about the items.
. At a .05% significance, we can reject the null and say that the test worked. Therefore, we should continue reminding people about the items.
c. At a .1% significance, we can not reject the null and say that the test worked. Therefore, we should stop reminding people about the items.
d. At a .1% significance, we can reject the null and say that the test worked. Therefore, we should continue reminding people about the items.