1. With the "method of comparison", a treatment group is compared to a control group.

2. When possible, a weighted average should be used to help with confounding factors.

3. Twelve people in a room have an average height of 5 feet 4 inches. A thirteenth person enters the room. How would this person have to be in order to raise the average height by 1 inch?

4. This table represents the distribution of 300 families by income in the U.S. in 1974. Class intervals include the left endpoint, but not the right. The histogram should be made such that the Income in thousands of Dollars is the horizontal scale.

Income Level Frequency Percent

0-2000 11 3.7

2000-4000 15 5

4000-7000 22 7.3

7000-10000 35 11.7

10000-16000 __ 12

16000-24000 __ __

24000-32000 70 23.3

32000-50000 55 18.3

50000 and over 5 1.7

When drawing this histogram, the height of the block from $7,000 to $10,000 will be:

1. The third quartile is the same as the ____ percentile.

2. The test scores in a math course are given as follows: 73, 84, 48, 95, 85. Find the average.

3. The test score in a math course are given as follows: 73, 84, 48, 95, 85. Find the SD.

4. The term "double blind" means that:

5. The standard deviation is a measure of ____.

6. The original NFIP study was run double-blind.

7. Which of the following studies is the most easily done, yet gives the most inaccurate results?

8. Use the following table to make the histogram, then find the percentage below 20.

Income Level Percent

0 - 5 15

5 -15 25

15 - 25 30

25 - 50 30

1. Twelve people in a room have an average height of 5 feet 4 inches. A thirteenth person enters the room. How would this person have to be in order to raise the average height by 1 inch?

2. This table represents the distribution of 300 families by income in the U.S. in 1974. Class intervals include the left endpoint, but not the right. The histogram should be made such that the Income in thousands of Dollars is the horizontal scale.

Income Level Frequency Percent

0-2000 11 3.7

2000-4000 15 5

4000-7000 22 7.3

7000-10000 35 11.7

10000-16000 __ 12

16000-24000 __ __

24000-32000 70 23.3

32000-50000 55 18.3

50000 and over 5 1.7

When drawing this histogram, the height of the block from $7,000 to $10,000 will be:

1. How could we find the likely size of the chance error in a single measurement?

2. For the given set of #s, find the median: -15, -8, 10, 26, 8, 2, 0, -10

3. Every data set follows the normal curve.

4. Find the area between -1.5 and 2.4 under the normal curve.

5. Find the average for: 8, 9, 14, -5, -26, 18, -4

6. For histograms in the density scale, the unit on the vertical scale is percent.