Table 1. List of NFL divisions that have won the Superbowl over the past 52 years.

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Arnold Bell
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1 MA 2113 Homework #1 Table 1. List of NFL divisions that have won the Superbowl over the past 52 years. NFC North AFC West NFC East NFC North AFC South NFC North NFC East NFC East AFC West NFC East AFC East AFC North NFC West AFC West AFC North AFC West AFC North NFC West AFC West NFC South AFC South AFC West NFC East AFC North NFC North NFC East NFC West NFC East AFC East NFC East AFC East NFC East NFC East NFC South AFC North AFC East AFC West NFC East AFC East NFC West AFC North NFC West NFC West AFC East AFC East AFC North NFC North NFC East AFC North AFC West AFC East NFC East 1. What type of data is this? Quantitative or Qualitative 2. Calculate the relative frequency and percentage by class. 3. Construct a bar graph of the relative frequencies by class. Class Frequency Relative Frequency %

Table 2. Test scores from Exam 2 from a Wildlife Science class. 74 88 41 78 87 59 68 58 73 71 64 70 87 68 86 79 79 64 50 85 85 46 79 85 58 96 62 57 83 82 72 49 64 4. What type of data is this?

2 Table 2. Test scores from Exam 2 from a Wildlife Science class What type of data is this? Quantitative or Qualitative 5. Calculate relative frequency of scores by class. You determine the class intervals, so you do not have to use all rows or you can add some. 6. Construct a histogram of relative frequency of scores by class.

3 MA 2113 Homework #2 Be sure to show all tables and calculations! Table 1. Average annual OPEC crude oil price from 1990 to 2018 (in U.S. dollars per barrel). Year Price What is the mean and standard deviation for average annual price? 2. What is the median and Five-number Summary (quartiles) for annual price?

4 MA 2113 Homework #3 1. Determine outliers, if any, and construct a boxplot for the following data. Table 1. Number of fish found in 16 small streams on Tombigbee National Forest in 2003 while sampling the fish community with a seine net For the following equations provide: a) y-intercept and slope (don t forget to do this!) b) a graph of the equation (plot at least 2 points other than the y-intercept) y = 2 + 2x y = 6 4x y = 1.5x 3 y = x 4

ST 2113 Homework #4 1. Calculate a regression equation using the (x, y) data below (8 points). We are interested to see if age of a used vehicle (x) has any relationship to cost (y).

com and searched for used car prices for my type of vehicle, a Nissan XTerra. I searched for used XTerra s from 2 (2014) 10 (2006) years of age within 100 miles of Meridian.

5 ST 2113 Homework #4 1. Calculate a regression equation using the (x, y) data below (8 points). We are interested to see if age of a used vehicle (x) has any relationship to cost (y). To check if you have done your work correctly, this should be your answer: ŷ = x Of course, show all your work. Table 1. I went to AutoTrader.com and searched for used car prices for my type of vehicle, a Nissan XTerra. I searched for used XTerra s from 2 (2014) 10 (2006) years of age within 100 miles of Meridian. I recorded the first ten ages (x) and prices (y) the search produced. For easier calculations, prices are given in $100 s. 2. Graph a scatterplot of the data along with the regression line from the regression equation (2 points).

6 MA 2113 Homework #5 1. Compute the coefficient of determination (r 2 ) for the regression equation calculated using the data below. Table 1. Size, x, in hundreds of square feet and price, y, in thousands of dollars from a random sample of 9 custom homes listed for sale in Phoenix, AZ. Size (x ) Price (y ) Hint: You will need to first calculate the regression equation as you did in Homework #4 (using the table above). You should get b 1 = 19.1 and b 0 =55.0. For the regression coefficient below, you should get r 2 = or 72.7%. Price (y )

7 MA 2113 Homework #6 1. Compute the Pearson correlation coefficient, r, for the data below. Table 1. Data from homework #5, size, x, in hundreds of square feet and price, y, in thousands of dollars from a random sample of 9 custom homes listed for sale in Phoenix, AZ. x y To check your final answer, r = X 100 = 85.4%

8 ST 2113 Homework #7 Name: Mississippi has 235 high schools that report mean ACT scores for graduating seniors. I have grouped the schools by their mean ACT score rounded to the nearest whole number (e.g., in the first row, there are 13 high schools with a mean ACT score of 15). (Hint: μ = 18.74) Reminder: You will have a quiz over this procedure when we meet for class after Spring Break on March 18. Please, contact me if you need help or would like me to send your graded homework via to study before the quiz. What is the population mean (μ) and SD (σ) for this population? ACT Score x Freq (Count)

(3 pts) 1. Which statements are usually true of a left-skewed distribution? (circle all that are correct)

(3 pts) 1. Which statements are usually true of a left-skewed distribution? (circle all that are correct) STAT 451 - Practice Exam I Name (print): Section: This is a practice exam - it s a representative sample of problems that may appear on the exam and also substantially longer than the in-class exam. It