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STATS 250 Study Guide - Quiz Guide: Confidence Interval

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emeralddonkey197
30 Oct 2014
School
U of M
Department
Statistics
Course
STATS 250
Professor
All

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STATS 250 Full Course Notes
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STATS 250 Full Course Notes
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Document Summary

These tell us about a population where our sample contains two measurements for each individual, and we are interested in testing the average difference between the two readings. Examples: attendance in the early morning vs. early afternoon, cholesterol before and after a treatment, price of items at shaws" and johnny"s foodmaster. We calculate confidence intervals and t statistics in much the same way as last week, except we are looking at the differences in the two data points, and treating this as the (single pop. ) sample. Make sure you can find them on your yellow card-they are under population mean. Remember- n is the number of individuals, not the total number of measurements! The d reminds us we are examining differences. Often, data entered in two columns is an indicator that this might be an appropriate test for that situation.

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Related textbook solutions

Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

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Related Questions

Zoo attendance. The Cincinnati Zoo and Botanical Gardens had a record attendance of 1.87 million visitors in 2017 (Cincinnati Business Courier website). Nonprofit organizations such as zoos and museums are becoming more sophisticated in their use of data to improve the customer experience. Being able to better estimate expected revenue is one of the analytics that allows nonprofits to better manage their operations.

The file ZooSpend contains sample data on zoo attendance. The file contains the data on 125 visits by families to zero: the amount spent, size of the family, the distance the family from the zoo (the gate attendee asks for the zip code of each family entering the zoo), and whether or not the family has a zoo membership (1=yes,Ā  0=no).

a. Develop an estimated regression equation that predicts the amount of money spent by a given family size, whether or not a family has a zoo membership (1= yes, 0=no).

b. Test the significance of the zoo membership independent variable at the 0.05 level.

c. Give an explanation for the sign of the estimate you tested in part (b).

d. Test the overall significance of the model at the 0.05 level of significance.

e. Estimate the amount of money spent in a visit by a family of five that lives 125 miles from the zoo and does not have a zoo membership.

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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
  1. Create an Ubuntu 20 LAMP server in EC2 like we did in class.
  2. 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).
  3. The default location of html and php files isĀ /var/www/html. Change to that directory. Now, using your favorite text editor useĀ sudoĀ to run your editor and create a file in that directory namedĀ 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.
  4. 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 enterĀ Ā as the url. Take a screenshot and save it (for submission below).
  5. Create a Windows 2016 Server, like we did in class. Ā 
  6. Login to it using Remote Desktop. Ā 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

Question 6.6 MARKS] Two friends like to send messages to each other, but they don't want anyone else to read the messages. To keep the messages private, they change each letter in the original message to a different letter of the alphabet. For every letter, they both know which letter will be substituted for it, which is called an encoding. The message will contain only lowercase letters. It will not contain whitespace, digits, or punctuation. The receiver of a secret message doesn't want to convert it back to the original message by hand. Instead, that person asks you to write a function to do it. Following the function design recipe, define a function that given a secret message and the encoding used, returns the original message. Choose a meaningful function name, and add a docstring that includes the type contract, the description, and two examples that return different values. You must choose the types to use to represent the data, and you will be marked not only on the correctness of the function, but also on your choice of data structures.