Final Exam - StatCrunch Project - Inferential Statistics

This StatCrunch project is your final exam, worth 20% of your grade, and is DUE on WEDNESDAY, July 16.   A late penalty of 10 points will be deducted for each day it is late with a final late grace period of July 19th.  After this a grade of a zero will be assigned.  You have one attempt at this assignment.  This means that once I grade it, you may not resubmit for a higher grade. 

You will use Inferential Statistics to make conclusions about your population using your sample data from "Revisiting our Data Collection on Statcrunch".  This assignment requires thoughtful explanations.  This assignment should also be your own work, any work that is AI generated will receive a grade of a zero.   

There are two sections to this project.  The first requires you to construct a confidence interval to estimate a population parameter while the second section requires you to complete a hypothesis test to test a claim about a population parameter.  You must use your chosen sample data from the "Revisiting our Data Collection on Statcrunch"

Confidence Intervals  

What will you be estimating in your population?  Your choice must have been motivated by your results in your previous Statcrunch project - descriptive statistics.  What results stood out to you?  For the descriptive statistics project, you only made observations. Now you get to estimate what is happening in your population based on the observations from your sample data.  

Look at whether you need quantitative or categorical data to answer your question. If you are using quantitative data then your estimate has to contain the population mean.  If you are using categorical data then your estimate has to contain the population proportion.

For example:

• Construct a confidence interval for the average number of hours Grossmont students work  (the average refers to the population mean)
• Construct a confidence interval for the proportion of Grossmont students who work full time (the proportion refers to the population proportion) 

Hypothesis Testing

What question will you try to answer?  This must have been motivated by your results in your previous Statcrunch project - descriptive statistics.  What results stood out to you?  For the descriptive statistics project, you only made observations. Now you get to make conclusions about your population based on the observations from your sample data.  

Look at whether you'll need quantitative or categorical data to answer your question. If you are using quantitative data then your research question has to contain the population mean.  If you are using categorical data then your research question has to contain the population proportion.

For example: 

• The average workday for students at Grossmont College is less than 5.2 hours  (the average refers to the population mean)
• The average GPA of students at Grossmont College is more than 2.89 (the average refers to the population mean)
• The percentage of students at Grossmont College who work full time is 30%  (the percentage refers to the population proportion)
• The percentage of students at Grossmont College who have a GPA of a 3.0 is more than 25%  (the percentage refers to the population proportion)

You have one attempt at this assignment.  This means that once I grade it, you may not resubmit for a higher grade.  The only reason you see multiple attempts is because this assignment will take you multiple days to complete.  You may have to come back to your assignment on different days to complete.  If Canvas does not save the work for you then be prepared to redo it.  For this reason, I strongly suggest that you SAVE YOUR WORK OUTSIDE OF CANVAS in case Canvas does not save your work.   You will be using what you learned from all of your previous quizzes, checkpoints, and statcrunch lab discussions.