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# Thread: Help a fellow Miscer out with his Statistics I quiz.

1. ## Help a fellow Miscer out with his Statistics I quiz.

If yall help me get a 100%, I will ANYTHING you want. (no homo)

1)You want to make a confidence interval for the true average price of regular, unleaded gas in Gainesville. A random sample of 5 gas stations reveals the following prices:

2.93, 2.97, 2.99, 2.96, 2.98

Can we use the t table to make this confidence interval?
a. Yes, because the sample is small.
b. Yes, since a plot of the data shows no outliers.
c. No, we should use the z table because the population is Normal.
d. Yes, since the problem is about means.

2) Last year, your company's service technicians took an average of 2.6 hours to respond to trouble calls from business customers who had purchased service contracts. Do this year's data show a different average response time?

The correct null and alternative hypotheses for this situation are:
a. Ho: x-bar=2.6 Ha: x-bar<2.6
b. Ho: x-bar=2.6 Ha: x-bar>2.6
c. Ho: x-bar=2.6 Ha: x-bar does not equal 2.6
d. Ho: mu =2.6 Ha: mu <2.6
e. Ho: mu =2.6 Ha: mu >2.6
f. Ho: mu =2.6 Ha: mu does not equal 2.6

3) Last year, your company's service technicians took an average of 2.6 hours to respond to trouble calls from business customers who had purchased service contracts. Your company wants to find out if this year's data show a different average response time. In order to do so, they review 42 service calls and construct a 95% confidence interval for population mean: (2.468, 2.743).

What can we conclude about the significance test of Ho: mu = 2.6 vs Ha: mu does not equal 2.6 ?

a. It's p-value will be smaller than .05.
b. It's p-value will be larger than .05.
c. It is impossible to tell what the p-value will be compared to .05.

4) When testing Ho: p=0.8 vs Ha: p not= 0.8 you get a p-value of 0.03. What can you say about the 90% CI for p based on the same

1. It will include 0.8.
2. It will not include 0.8.
3. It will include 0.
4. It will not include 0.
5. It will include 0.03.
6. It will not include 0.03.
7. It will include 0.95.
8. It will not include 0.95.

5) An employment information service claims that the mean annual pay for full time male workers over age 25 and without high school diplomas is \$18,600.
You decide to test this claim - you think that that value is too low. You collect a random sample of 10 men over the age of 25 that do not have a high school diploma.
The test statistic is 0.57.
Which of these statements is true about the p-value?

a. The test statistic is not on the table; therefore, we can't find a p value.
b. the p-value is greater than 0.10
c. the p-value is 0.2157
d. the p-value is 0.2843
e. The p-value is less than 0.10

2. uppity

3. Question 1 is A

4. damn it, up again

Question 1 is A
Why couldnt it be B?

6. no one?

7. im start posting noodz

8. post away

9. Originally Posted by peijian
Why couldnt it be B?
If you have less than 30 samples, you use a T distribution.

10. Lulz have this exact same question now.

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