STAT Help!

Name: ____________________________________.

Instructions

1. Show all of your work on this assignment. If you provide answers without showing your work or explanation, then you will lose all the points associated with the questions.

2. Clearly and legibly PRINT your answer.

3. Use three decimal places in your calculation and answer (unless noted otherwise).

1. A sample of 20 families from Cobb County reported how many children they have and the results are shown below.

Manually draw a bar graph using the above table. *Make sure you give a label to the X-axis and Y-axis.

2. Draw a frequency distribution along with a frequency polygon (overlap the frequency polygon on top of the frequency distribution) that is _____.

a) Bimodal

b) Multimodal

c) Rectangular

d) Mesokurtic / Leptokurtic / Platykurtic in the same plane (frequency polygon only without bars and clear indicate which frequency polygon is for which distribution).

e) A normal curve with some outliers

3. Draw a positively skewed distribution and a negatively skewed distribution noting where the mean, median, and mode would fall with respect to each other in these distributions.

Negatively Skewed Positively Skewed

4. A researcher recorded the gender of his participants as follows: 1 = Female and 2 = Male. Which measure of central tendency would be most useful to describe the gender of the sample? Explain your answer: ___________________________________________________________________ _____________________________________________________________________________.

5. A small store manager needs to stock the men’s clothing section with men’s shirts. However, she can keep only one size out of five shirts sizes possible. To maximize the profit of the store, which measure of central tendency of men’s shirt sizes should be used? Explain your answer: ___________________________________________________________________________________________________________________________________________________________.

6. Imagine that 86,999 people who are penniless live in a small town in Georgia. Bill Gates, whose net worth is $87,000,000,000 moves to the town. Now the mean net worth in this town is __________ and the median net worth is _________. As shown in this example, one advantage of the median over the mean is (explain an advantage of the median over the mean): ______________________________________________________________________________ ___________________________________________________________________________________________________________________________________________________________.

7. Calculate the mean, median, and mode for the following sample: 1, 1, 6, 9, 10, 11, 15, 17, 18, 20. Mean: __________ (show your work)

Median: _________ (show your work)

Mode: _________

If you need to choose a representative value of this variable, which one would you NOT choose and why? _____________________________________________________________________.

SPSS Practice Tasks

General instructions for the SPSS tasks

· As an outcome of the SPSS Practice Tasks, you need to generate two kinds of SPSS files: SPSS data editor file (.sav) and SPSS output viewer file (.spv). Post them in the assignment folder, [Manual Calculation and SPSS Practice #].

· You need to post a .sav file that includes ALL the raw data needed for the SPSS Practice tasks.

· Do not post multiple .sav files. Instead, keep all the raw data used in a single .sav file (i.e., use different columns for different variables).

· Remember to give an appropriate name to the variable. No variable name would cause a point deduction for each question.

· Similarly, you need to post a single .spv file that includes all the outputs (SPSS will add results to the previous results and will give you just one output file unless you close the output file from the previous analysis).

· Do not post multiple .spv files. Also, in the posted .spv file, keep proper outcomes only and eliminate other outcomes that were generated while you were working on this homework (to delete an item in the output file, select the item – right click – hit cut).

1. Sports scientists sometimes talk of a ‘red zone’, which is a period during which players in a team are more likely to pick up injuries because they are fatigued. When a player hits the red zone it is a good idea to rest them for a game or two. Atlanta Hawks measured how many consecutive games the 11 key players could manage before hitting the red zone: 10, 16, 8, 9, 6, 8, 9, 11, 12, 19, 5.

Make a frequency table and a grouped frequency table with an interval of 5, and their corresponding bar graphs.

2. Celebrities always seem to be getting divorced. The (approximate) length of some celebrity marriages in days are: 240 (J-Lo and Cris Judd), 144 (Charlie Sheen and Donna Peele), 143 (Pamela Anderson and Kid Rock), 72 (Kim Kardashian, if you can call her a celebrity), 30 (Drew Barrymore and Jeremy Thomas), 26 (Axl Rose and Erin Everly), 2 (Britney Spears and Jason Alexander), 150 (Drew Barrymore again, but this time with Tom Green), 14 (Eddie Murphy and Tracy Edmonds), 150 (Renee Zellweger and Kenny Chesney), 1657 (Jennifer Aniston and Brad Pitt).

Again, the scores are 240, 144, 143, 72, 30, 26, 2, 150, 14, 150, 1657

Make a frequency table, a grouped frequency table with an interval of your choice, and the corresponding bar graphs.

3. Repeat the above task but excluding Jennifer Anniston and Brad Pitt’s marriage. That is, make a frequency table, a grouped frequency table with the same interval as above, and the corresponding bar graphs.