Grossmont College Probability Statistic Question

Question 3 – Confidence Intervals

Prompt

1. Of the students randomly chosen for your data set, what percent of students do not work any amount?
   • Sort the “work” column in ascending order to easily find the number of students who do not work and use that value to create a percentage. Watch this short video to learn how to sort the work column (Links to an external site.) in your data set.
2. Use the percentage in part a) to create a 95% confidence interval estimate for the percentage of all college students who do not work. (see concepts in Units 7 & 8 – Modules 17-23)
   • Show your work. You can either use the math-type feature in Canvas to write out your steps or you can take a picture and upload handwritten work.
   • Interpret your confidence interval in complete sentences. “We are 95% confident that…”
3. What is the margin of error for the confidence interval you found? What could you do to make the confidence interval more precise/smaller? Explain using complete sentences.

StatCrunch Resources

Here is a PDF document with all StatCrunch directions

How & What to Turn In

Submit your answers to the prompt above. There are no StatCrunch tables or graphs that need to be included with this question, but you do need to show your steps for calculating the confidence interval. You can turn your work in either by typing in your response into a textbox (just like we have done in our discussion boards) or you can write up your response to the prompt in a word document and submit that. When you are ready to submit your work, click on “Submit Assignment”.

Discussion Board

Use the Final Project discussion board (opens in a new tab) to ask questions or provide feedback about the information provided above.