Quiz I/Key

Math 1107

Quiz 1

1. (10 points) A survey classifies Kennesaw State University students as either traditional or non-traditional. This variable is

A. quantitative

B. qualitative

2. (10 points) An experiment studies the color of cars of Kennesaw State University students. This variable is

A. quantitative

B. qualitative

3. (10 points) An experiment studies the number of tickets written each day by campus police for illegal parking by Kennesaw State University students. This variable is

A. discrete

B. continuous

4. (10 points) Consider the following stem-and-leaf display for recent home sales in Atlanta in hundreds of thousands of dollars.

Stem	Leaf
0	78, 78, 83, 89, 99
1	12, 17, 27, 35, 45, 49, 59
2	00, 05, 12, 19, 22
3	50, 99
4	00, 05
5	50
6	99
7	49

Which of the following prices was a recent home sale in Atlanta?

I	$83,000
II	$117,000
III	$450,000

A. I only

B. II only

C. I and II only

D. I and III only

E. II and III only

F. I, II and III

5. (10 points) A frequency chart for recent home sales inside and outside the perimeter is given below.

Range	Inside Perimeter	Outside Perimeter
Below $100,000	3	7
$100,000-$200,000	9	18
$200,000-$300,000	12	3
$300,000-$400,000	13	5
$400,000-$500,000	11	1

The relative frequency of houses sold outside the perimeter in the $100,000-$200,000 range is approximately

A. 0.12

B. 0.24

C. 0.26

D. 0.53

E. none of the above

6. (15 points) What does the distribution of the data in problem number 5 indicate about the prices of houses relative to location inside or outside of the perimeter?

7. (15 points) A report sponsored by the Florida Citrus Commission concluded that cholesterol levels can be lowered by eating citrus products. Why might this conclusion be suspect?

8. (20 points) Consider the sample . Find each of the following.

mode

median

upper quartile

Bonus! (15 points) Given the table of Titanic mortality statistics, discuss whether the phrase ‘women and children first’ applied during this tragedy.

	Men	Women	Boys	Girls	Total
Survived	332	318	29	27	706
Died	1,360	104	35	18	1,517
Total	1,692	422	64	45	2,223

Key

1. B

2. B

3. A

4. Stem & Leaf displays are no longer covered in Dr. DeMaio's course.

5. D The relative frequency of houses sold outside the perimeter in the $100,000-$200,000 range is 18/34=.529

6. It would seem to indicate that houses sold outside the perimeter are cheaper than those sold inside the perimeter.

7. The conclusion might be suspect because the Florida Citrus commission would benefit from the image that cholesterol levels are lowered by eating citrus products.

8. The average is 4.08. The sample standard deviation is 9.93. The mode is 3. The median is 3. the upper quartile is 7.5.

Bonus!

When you consider the table of relative frequencies below, it becomes quite clear that the phrase 'women and children first' did apply. An overwhelming percentage of men died compared to the percentage of women and children that died. The initial apparent discrepancy in the raw numbers is due to the fact that there were far more men on board than women and children.

	Men	Women	Boys	Girls
Survived	0.196	0.754	0.453	0.6
Died	0.804	0.246	0.547	0.4

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