Midterm/Final Exam Material
Test Date: Thursday January 19, 10:30
Updates
  • FAQ: Got Practice Problems?
      Start with The Sample Midterm
      There are also good practice problems at the end of each part of the book (after each group of chapters) and you can use the practice problems from the book that look the the ones in the practice test.
  • FAQ: Can I use my notes and the practice problems on the test?
      Nope.
      But you can either prepare a page of calculator notes, or use the texbook, during the exam. Prepare yourself in such a way as to NOT spend a lot of time trying to figure out where certail functions are in the calculator - practice ahead of time and bookmark pages that will help you with the calculator.
  • FAQ: What should I study from correlation and stuff like that?
    1. Class exercises using the caluculator to find correlation: Correlation.pdf.
      In class we created to lists [YR and TUIT] following the steps in the textbook. Enter the data, create a scatterplot, show the regression line, calculate the correlation coefficient. All good stuf - and only 2 pages long.
    2. We covered correlation topics in Chapter 7. You should have the completed the Class Notes from Chapter 7 (pdf) and this would be a good start.
    3. Chapter-07.pdf contains a pdf version of the PowerPoint presentation used in class and it contains the Smart Notebook pages that we used to solve some problems and for using the calculator for scatterplots.If is worth a review.
    4. Scatter plot, correlation, line of best fit powerpoint show is available, I didn't create it but it might provide some review for some of these terms.
    5. Midterm Chapter 7/8 sample problems and answers

  • Sample Questions .This is a question bank for short-answer and open response type questions
Easy Access sample questions/solutions

Normal Distribution
Question:
The Wechsler Adult Intelligence Scale Revised (WAIS-R) follow a Normal model with mean 100 and a standard deviation 15.
  1. What percentage of adults taking this test will score below 80?
  2. Describe the highest 10% of the scores of adults taking this test
Solution Notes:
First off, you should draw and label a Normal Distribution graph with all of the information you have, so you can visually see if your answers will make sense.
  1. Use the normalcdf functions with a low of 0 and high of 80, plug in the mean of 100 and standard deviation equal to 15.
    normalcdf(0,80,100,15) = 0.09121
    Does 9.1% make sense here?
    The mean is 100, so one standard deviation away from the mean would represent a range from 85-115. Two standard deviations would represent a range from 70-130. 80 is between 1 and 2 standard deviations away from the mean. Plotting this information on a graph should help you to explain that this is a reasonable answer.
  2. Draw another Normal Distribution - look at the area that you would shade in to represent the highest 10%, or the score S that would reprent the 0-90% range.
    The function that you would use to find the answer is invnorm with parameters .9 (to find the 90% lowest - or 10% highest score), the mean=100 and standard deviation=15.
    invnorm(.9, 100, 15) = 119.22

    Check your answer with normalcd - do 90% of the people taking the test score below 119.22?
    normalcf(0,119.22, 100, 15) = .89997 - so 119.22 looks like a good answer.

Reference
Reference: Chapter PowerPoints Files

Other course materials you may wish to revisit.