AP Statistics

What shape is a normal distribution curve?

• Half curve

• Round curve

• Bell curve

• Square curve

The scores on a university examination are Normally distributed with a mean of 62 and a standard deviation of 11. If the bottom 5% of students will fail the course, what is the lowest mark that a student can have and still be awarded a passing grade?

• 40

• 43

• 44

• 57

• 62

The stem-and-leaf diagram below gives the distribution of the ages in years of 20 participants at a family reunion. Which of the following statements about the distribution is correct?

• The distribution of ages is skewed left.

• The median age was 45 years old.

• The oldest person in attendance was 98.

• 20% of the attendees are younger than 10 years old.

Of the following dotplots, which represents the set of data that has the greatest standard deviation?

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• 
• 

Gina's doctor told her that the standardized score (z- score) for her systolic blood pressure, as compared to the blood pressure of other women her age, is 1.50. Which of the following is the best interpretation of this standardized score?

• Gina's systolic blood pressure is 150.

• Gina's systolic blood pressure is 1.50 standard deviations above the average systolic blood pressure of women her age.

• Gina's systolic blood pressure is 1.50 above the average systolic blood pressure of women her age.

• Gina's systolic blood pressure is 1.50 times the average systolic blood pressure for women her age.

• Only 1.5% of women Gina's age have a higher systolic blood pressure than she does.

The ___________________ measures the percent of the variability in the response variable that is accounted for by the least-squares regression line.

• correlation r

• coefficient of relaxation

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases

• As x increases, y increases

• As x decreases, y decreases

An independent research company wants to go door to door to survey people in the city of Fontana. The company decides to number all blocks within the city limit, randomly choose 1 block and survey all households on that block. This is an example of:

• Simple Random Sample

• Stratified Random Sample

• Cluster Random Sample

• Systematic Random Sampling

In order to estimate the proportion of students that text while driving, a school administrator selects a simple random sample of students from a list of all students at the school who have parking permits. The students are called to the office, one at a time. The administrator asks each student, “Do you text while driving, even though you are not supposed to?” Based on the survey, the administrator estimates that only 2% of students with parking passes text while driving. What potential bias is present in the design of this survey and what is the likely direction of the bias?

• The sample proportion is likely an underestimate of the population proportion due to response bias.

• The sample proportion is likely an underestimate of the population proportion due to undercoverage.

• The sample proportion is likely an underestimate of the population proportion due to nonresponse.

• The sample proportion is likely an overestimate of the population proportion due to response bias.

• The sample proportion is likely an overestimate of the population proportion due to undercoverage.

Given the following VENN Diagram answer the following.
P( A | B )

• 2

• 2/3

• 3/2

• .8