STAT 101 Lecture 2: rec02notes

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violetswan289

3 Apr 2016

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Document Summary

The rst item on our agenda today is to discuss a problem in groups. Then, we"ll get on to the main topic, which is to talk about graphical and numerical summaries of data using examples from the survey from last class. In particular, we"ll talk about using r to play with the data. You can access the survey data from my website. Some companies claim to be able to increase sat scores by 100 points or more if students take one of their expensive classes. The way this is usually measured is as follows. Students are given a past sat exam, which is then scored by the company. Students then take the course, and then they take an exit test. It is on this exit test, which is also a past sat exam, that the company gets the 100 points from. Discuss amongst yourselves, and then we"ll return to this as a class.

Related Questions

In mid-July, some businesses like to remind us that the holiday seasons are coming soon. Just like these businesses, the following questions will immerse you in the festive spirit and will (hopefully!) make you forget the heat waves. An article published in 2016 published the results of a survey on Canadians’ behaviour during this period. You are asked to answer the following questions

(a) From the data in the article, explain how we can show that the average amount planned to spend in 2016 for the group of 35+ years old is greater than $680,58 in the sample. Assume that there are 450 people that are between 18 and 34 years old in the sample.

(b) Using the article in reference, can we affirm that in 2016 the gap between the average amount planned to spend between the 18-34 years old and the 35+ years old is greater than 275 $ in the population, in favour of the 35+ years old? Assume the sample’s standard deviation is 150 $ among the 18-34 years old and that the sample’s standard deviation is 200 $ among the 35+ years old. You can also assume that the populations are normal. Use a significance level of α = 0, 01.

(c) Build and interpret a 98 % confidence interval that estimates the gap between the average amount planned to spend between the 18-34 years old and the 35+ years old in 2016. Could we use this interval to find the conclusion of the hypothesis test performed in (b)?

maroonraccoon733

Use the following scenario for questions 6 – 8. In 2016-17, the average SAT score of the UVA first year class was 1420 out of 1600. An advisor in the statistics department is interested in determining whether statistics majors from that class have higher SAT scores than the average. He tests H,:µ = 1420 against Hạ: µ > 1420, where u is the mean SAT score for statistics majors from the 2016-17 first year class. In a simple random sample of 30 statistics majors, he finds a sample mean SAT score of 1440 with sample standard deviation of 40.

6. What is the value of the test statistic for this significance test?

a. 0.09

b. 0.5

c. 2.73

d. 20

7. From what distribution is this test statistic?

a. N(0, 1)

b. N(1420, 7.30)

c. t distribution with 29 degrees of freedom

d. t distribution with 28 degrees of freedom

8.) The p-value for this test is 0.005. Which of the following is a proper interpretation of this p- value?

a.There is a 0.5% chance that the null hypothesis is true.

b. If the population mean SAT score really is 1420, there's a 0.5% chance that the sample a. mean SAT score from 30 statistics majors would equal 1440.

c.If the population mean SAT score really is 1420, there's a 0.5% chance that the sample mean SAT score from 30 statistics majors would be 1440 or lower.

d. If the population mean SAT score really is 1420, there's a 0.5% chance that the sample mean SAT score from 30 statistics majors would be 1440 or higher.

beigeserval271

Learning Objectives

After successfully completing this assignment, students will be able to:

Configure, run, and test a linux server in AWS' EC2
Configure, run, and test a Windows server in AWS' EC2

Requirements

Create an Ubuntu 20 LAMP server in EC2 like we did in class.
Verify your that Apache was installed by opening your browser and enter the public dns of your server in the address bar. If it does not connect either you did not add HTTP to the Security Group, or the install did not work properly. Take a screenshot and save it (for submission below).
The default location of html and php files is /var/www/html. Change to that directory. Now, using your favorite text editor use sudo to run your editor and create a file in that directory named info.php. For example, sudo nano info.php Then enter the following in that file to show information about the PHP installation: <?php phpinfo(); ?> Save the changes to the file and exit the editor.
Now in your browser, enter the public dns of your server in the address bar / info.php. For example, my public dns was ec2-54-89-230-235.compute-1.amazonaws.com, so I enter as the url. Take a screenshot and save it (for submission below).
Create a Windows 2016 Server, like we did in class.
Login to it using Remote Desktop. Take a screenshot of Remote Desktop connected to your Windows Server and save it (for submission below).

Clean Up

Now that you have completed the assignment, stop or terminate your EC2 instances. Stopping them means that it is now longer running, but your data is saved. That means you will not accrue charges on your running server. Terminating will both stop and delete the instances (also not accruing charges).

What to Submit

Screenshot of Apache page on your server shown in your browser
Screenshot of the PHP info page on your server shown in your browser
Screenshot of Remote Desktop session to your Windows Server

jayson

STAT 101 Lecture 2: rec02notes

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