# AP Stats Unit One Multiple Choice

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This is the multiple choice for chapter one for semester one final. If you have Ms. McFall, this is your class.

a. Eye color

a. The mean

### The mean salary of all female workers is \$35000. The mean salary of all the male workers is \$41000. What is true about the mean salary of all workers? a. It must be \$38000. b. It must be larger than the median salary. c. It could be any number between \$35000 and \$41000. d. It must be larger than \$38000. e. It cannot be larger than \$40000.

c. It could be any number between \$35000 and \$41000.

### Which of the following statements is NOT true? a. In a symmetric distribution, the mean and the median are equal. b. The first quartile is equivalent to the twenty-fifth percentile. c. In a symmetric distribution, the median is halfway between the first and third quartiles. d. The median is always greater than the mean. e. The range is the difference between the largest and the smallest observation in the data set.

d. The median is always greater than the mean.

c. 95

### What are all the values that a standard deviation can possibly take? a. 0< or equal to s b. 0< or equal to s< or equal to 1 c. -1< or equal to s< or equal to 1 d. s< or equal to 0 e. Any real number

a. 0< or equal to s

c. I and II

### Suppose that a Normal model described student scores in a history class. Parker has a standardized score (z-score) of +2.5. This means Parker a. is 2.5 points above average b. is 2.5 standard deviations above average for the class c. has a standard deviation of 2.5 d. has a score that is 2.5 times the average for the class e. None of the above

b. is 2.5 standard deviations above the average for the class

### Which of these variables is least likely to have a Normal distribution? a. Annual income for all 150 employees at a local high school b. Lengths of 50 newly hatched pythons c. Heights of 100 white pine trees in a forest d. Amount of soda in 60 cups filled by an automated machine at a fast-food restaurant e. Weights of 200 of the same candy bar in a shipment to a local supermarket

a. Annual income for all 150 employees at a local high school

b. 3

e. timeplot

d. 875

a. None of these

### Which of the following is NOT CORRECT about a standard Normal distribution? a. The proportion of scores that satisfy 0<Z<1.5 is 0.4332. b. The proportion of scores that satisfy Z< -1.0 is 0.1587. c. The proportion of scores that satisfy Z>2.0 is 0.0228. d. The proportion of scores that satisfy Z< 1.5 is 0.9332. e. The proportion of scores that satisfy Z> -2.5 is 0.4938.

e. The proportion of scores that satisfy Z> -2.5 is 0.4938.

### The change in scales makes it hard to compare scores on the 1994 math SAT (mean 470, standard deviation 110) and the 1996 math SAT (mean 500, standard deviation 100). Jane took the SAT in 1994 and scored 500. Her sister Colleen took the SAT in 1996 and scored 520. Who did better on the exam, and how can you tell? a. Colleen--she scored 20 points higher than Jane. b. Colleen--her standard score is higher than Jane's. c. Jane--her standard score is higher than Colleen's. d. Jane--the standard deviation was bigger in 1994. e. Can't tell from the information given.

c. Jane--her standard score is higher than Colleen's.

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