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Write your final answers on the lines. Show your computations. Use correct symbols. 1. For the following variables determine the level of measurement and whether the variable is discrete or continuous The time it takes a rat to run a maze Rank in the Army Number of students enrolled in PSY 202 Race (as in Asian, etc.) 2. How would the following mathematical operation be expressed in summation notation? Add two to each score, square the resulting values, then add these squared values. a. Σχ + 22 2 3. What about this one: Divide each score by 3, sum the resulting numbers, then square the sum? d.ΣΧ/32

4. Given the following data XY 4 a. Compute ΣΧ b. Compute sX C. Compute (SX)2 d. Compute EXY

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5. Give a reason as to why one would create a grouped frequency distribution and histogram, as opposed to an ungrouped frequency distribution and histogram This material may not be distributed without the explicit consent from its author, Dr. Nick Prin

6. Here are the number of words remembered for the 23 students that counted the number of times the letter e appeared in the list of words shown in class a. Create a frequency distribution of these numbers in the table below (include percentages)

b. Create a frequency histogram on the axes below.

c. Create a frequency polygon on the axes below

7. The heights of all Ole Miss undergraduate students is measured in inches. Their average heigth is 66 inches. Which of the following would be a reasonable value for the standard deviation of their height? a. 0.3 b. 3 c.40 d. 300 8. The GPA of all Ole Miss undergraduate students is measured. The average is 2.7. Which of the following would be a reasonable value for the standard deviation? a. 0.05 b. 0.5 C. 2.0 d. 15 9. The average temperature on the North pole in January is -30°F. Which of the following would be a reasonable value for the standard deviation of the Stemperature in January? a. -100 b.-8 C. 6 d. 100 10. The contents of 100 unopened 12 oz. soda bottles is measured. The average content is 12.1 oz. Which of the following would be a reasonable value for the standard deviation? a. -12.1 b. -0.1 c. 0.05 d. 1 11. Give a reasonable guess for the values of the mean and standard deviation of:

С. 0.05 d. 1 11. Give a reasonable guess for the values of the mean and standard deviation of: Mean SD a. Weights of Ole Miss undergraduate students (in lbs.) b. Price (in $) charged for a gallon of unleaded gas measured across all gas stations in Oxford today c. Days high temperature in °F in Oxford measured across the year d. Number of hours slept per night measured across all US adults When done, fold your homework lengthwise (text inward) and write your name at the top on the ouside.

math   Statistics-And-Probability   
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Answer #1

1 Variables 2 Time 3 rank 4 Number of students ratio scale s Raco measurement scale types continuous discrete discrete discrete. ordinal scale Nominal scale

2) The correct option is c)

For example: suppose the original data is as X : 4 , 6, 8

Then X + 2 : 6 , 8, 10

then ( X + 2)^2 : 36, 64, 100

Then take sum, so we get :  

sum (X+2)^{2}

3) The correct option is b

left ( sum X/3 ight )^{2}

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