Inferences Review

What does this symbol represent?

• Mean
• Median
• Mode 
• Standard Deviation

What does this symbol represent?

• Sigma

• Variance

• Mean Absolute Deviation

• Standard Deviation

The z-score represents.....

• the percentile the data value is above or below the mean.

• the number of standard deviations a data value is above or below the mean.

• the amount of standard deviations a data value is above or below the median.

• the percent the data value is above or below the mean.

The percentile represents the....

• percent of data values that are below.

• percent of data values that are above.

• number of data values that are below.

• number of data values that are above.

What is the standard deviation for the data given:

5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 6.89

• 7.26

• 9

• 10.1

An algebra 2 test has 6 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 6 questions, what is the probability that you get exactly 3 questions correct? (You need to figure out the p value first. It is not given to you.)

• 0.9620

• 0.1318

• 0.8314

• 0.3125

5% of workers in the US use public transportation to get to work. You randomly select 250 workers and ask them if they use public transportation to get to work. Find the Probability that exactly 16 workers say yes.

• .8769

• .1923

• .0637

• .0403

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school. What is the probability that at most 2 of the first 10 blood donors has Type B blood?

• 0.0885

• 0.6972

• 0.2143

• 0.9115

The monthly phone bills in a city are normally distributed with a mean of $40 and a standard deviation of $12. Find the x-value on the normal distribution curve that correspond to a z-score of 3.17.

• $1.96

• $78.04

• $43.17

• .9992

The distances male long jumpers for State College jump are approximately normal with a mean of 263 inches and a standard deviation of 14 inches.

Suppose a male long jumper's jump ranked in the 75th percentile. How long was his jump?

• 263 inches

• 272.44 inches

• 197.25 inches

• 460.25 inches