Final Exam Review Questions You should work each of the following on your own, then review the solutions guide. DO NOT look at the solutions guide first. 1. Explain the difference between a population and a sample. In which of these is it important to distinguish between the two in order to use the correct formula? mean; median; mode; range; quartiles; variance; standard deviation. 2. The following numbers represent the weights in pounds of six 7year old children in Mrs. Jones' 2nd grade class. {25, 60, 51, 47, 49, 45} Find the mean; median; mode; range; quartiles; variance; standard deviation. 3. If the variance is 846, what is the standard deviation? 4. If we have the following data 34, 38, 22, 21, 29, 37, 40, 41, 22, 20, 49, 47, 20, 31, 34, 66 Draw a stem and leaf. Discuss the shape of the distribution. 5. What type of relationship is shown by this scatter plot? 45 40 35 30 25 20 15 10 5 0 0 5 10 15 20

6. What values can r take in linear regression? Select 4 values in this interval and describe how they would be interpreted.

7. Does correlation imply causation? 8. What do we call the r value. 9. To predict the annual rice yield in pounds we use the equation ˆ y = 859 + 5.76 x1 + 3.82 x2 , where x1 represents the number of acres planted (in thousands) and where x2 represents the number of acres harvested (in thousands) and where r2 = .94. a) Predict the annual yield when 3200 acres are planted and 3000 are harvested. b) Interpret the results of this r2 value. c) What do we call the r2 value? 10. The Student Services office did a survey of 500 students in which they asked if the student is part-time or full-time. Another question asked whether the student was a transfer student. The results follow. Transfer Non-Transfer Row Totals Part-Time Full-Time 100 170 110 120 230 210 290 500

Column Totals 270

a) If a student is selected at random (from this group of 500 students), find the probability that the student is a transfer student. P (Transfer) b) If...

...Name: Navin Janmohammad
1. Using the MM207 Student Data Set:
a) What is the correlation between student cumulative GPA and the number of hours spent on school work each week? Be sure to include the computations or StatCrunch output to support your answer.
ANSWER: Correlation: 0.30790085
From StatCrunch:
Correlation between Q10 What is your cumulative Grade Point Average at Kaplan University? And Q11 How many hours do you spend on...

...to Sell |
Mean | 474.0075 | Mean | 454.2225 | Mean | 106 |
Median | 437 | Median | 417.5 | Median | 96 |
Maximum | 975 | Maximum | 975 | Maximum | 282 |
Minimum | 169.9 | Minimum | 165 | Minimum | 28 |
Standard Deviation | 197.29003 | Standard Deviation | 192.5177534 | Standard Deviation | 58.2168207 |
Based on the chart, the mean was calculated by adding up the sum of the list and divide 40, which the number of the...

...Programming Projects
1. The results of a true-false exam given to a computer science class has been coded for input to a program. The information available for each student consists of a student identification number and the student's answers to ten true-false questions. The available data are as follows:
2. Student
3. identification Answer string
4.
5....

...PART A:
i) Male:
Female:
The mean value of life satisfaction for male is about 7.7459 while for female is 7.7101, which proves there is no significant different life satisfaction between male and female, thus gender does not affect life satisfaction a lot. But when it comes to sample variance, for male is 2.5684 while for female is 3.0081. From this pair of figures it is obvious that the life satisfaction for female is more flexible than male. Man’s life...

...hours they read a week.
7. Calculate the mean, median, and mode for your data as a whole.
3+4+5+5+5+8+10+14+18+20+20+25+25+30+30=222/15=14.8
The mean is 14.8
3,4,5,5,5,8,10,14,18,20,20,25,25,30,30
The median is: 14
3,4,5,5,5,8,10,14,18,20,20,25,25,30,30
The mode is: 5
8. Now calculate the mean, median, and mode of each of your classes or groups.
First, I will do the ages.
13+14+16+16+17+21+22+27+33+36+37+38+40+43+52=425/15=28.3...

...
d. Nominal
2. What was the mean posttest empowerment score for the control group?
The mean posttest empowerment score for the control group was 97.12
3. Compare the mean baseline and posttest depression scores of the experimental group. Was this an expected finding? Provide a rationale for your answer.
When comparing the mean baseline and post test depression scores of the experimental group, shows a 6 point...

...central tendency. Under what condition(s) should each one be used?
Mean- Works good when it comes to test scores
Median- should be used when describing something like average income.
Mode= is good is you want to see what is you best seeing product in a store situation.
2. Last year, 12 employees from a computer company retired. Their ages at retirement are listed below.First, create a stem plot for the data. Next, find the mean retirement age. Round to the...

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