BSTAT 3321 Practice Final Exam

1. The two graphical techniques we usually use to present nominal data are

a. bar chart and histogram

b. pie chart and ogive

c. bar chart and pie chart

d. histogram and ogive

2. Which of the following are deceptive practices

a. Using a pie chart instead of a bar chart

b. Using a bar chart instead of a line graph

c. Showing only absolute changes in value with a truncated vertical

axis

d. All of the above are deceptive

3. In a positively-skewed distribution,

a. the median equals the mean

b. the median is less than the mean

c. the median is larger than the mean

d. the mean, median, and mode are equal

4. The Empirical Rule states that the percentage of measurements in a data

set (providing that the data set has a bell-shaped distribution) that fall

within two standard deviations of their mean is approximately:

a. 68%

b. 75%

c. 95%

d. 99.7%

5. Which of the following statements is true for the following data values:

7, 5, 6, 4, 7, 8, and 12?

a. The mean, median and mode are all equal

b. Only the mean and median are equal

c. Only the mean and mode are equal

d. Only the median and mode are equal

6. Which of the following sampling plans does not use random methods

of selections?

a. Simple random sampling.

b. Stratified random sampling.

c. Random cluster sampling.

d. Self- selected opinion poll. (SLOP)

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7. If two events are mutually exclusive, what is the probability that both occur

at the same time?

a. 0.00

b. 0.50

c. 1.00

d. Cannot be determined from the information given.

8. If A and B are independent events with P(A) = 0.20 and P(B) = 0.60,

then P(A|B) is:

a. 0.20

b. 0.60

c. 0.40

d. 0.80

9. The number of fans at a Cowboy’s game over a given time interval is an

example of a(n) __________ random variable. The length of the game

in minutes is an example of a(n) _________random variable.

a. Exponential; Poisson

b. Continuous; discrete

c. Discrete; Continuous

d. None of the above

10. The probability of 3 or fewer heads in 10 tosses of an unbiased coin is

a. .117

b. .883

c. .172

d. None of the above

11.Airlines always overbook because of no shows. The probability of a no

show for a reservation is .10. If a flight has 100 reservations, what is

the expected number of passengers who will actually show up? What

is the variance of the number of passengers who actually show up?

a. 10,100

b. 90, 9

c. 10, 9

d. None of the above

12. Given that the random variable X is normally distributed with a mean of

75 and a standard deviation of 5, P (65<X<85)?

a. 0.3413

b. 0.6826

c. 0.9544

d. None of the above

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