Quiz 2
1. Using the data, determine which ONE of the answers is correct.
a. The mean and median are equal.
b. The mean is smaller than the median.
c. The mean is larger than the median.
2. Interpret the boxplot.
a. 75% of the data are at most 5.
b. There is about the same amount of data from 2 - 5 as there is from 5 - 7.
c. There are no data values of 3.
d. 50% of the data are 4.
3. In a set of data, all the data appear with the same frequency. Then,
a. the standard deviation is always 0.
b. the mean is always larger than the standard deviation.
c. all of the data have the same value.
d. the boxplot does not always look symmetrical.
4. Find the 60th percentile.
a. 14
b. 60
c. 15
d. 0.2344
5. The data is {4, 6, 6, 12, 18, 18, 18, 200}. What value is 2 standard deviations above the mean?
a. There is not enough information.
b. Approximately -98.
c. Approximately 102.
d. Approximately 169.
6. For the following data, which of the measures of central tendency would be the LEAST useful? Data: 14, 16, 16, 22, 25, 38, 38, 38, 38, 2000.
a. mean
b. mode
c. median
7. Use the table below. What percent of the data is either 34 or 44 minutes?
a. Approximately 78%
b. Approximately 13%
c. Approximately 98%
d. Approximately 20%
8. Sixty-four faculty members were asked the number of cars they owned (including spouse and children's cars). The results are given in the histogram. The number of responses that were either "1" or "3" is approximately:
a. 0.4
b. 27
c. 40
d. 2
9. On a recent De Anza opening day, 64 faculty members were asked the number of cars they owned (including spouse and children's cars). The results are given in the histogram. Which answer DOES NOT describe the data?
a. There are approximately 10 faculty that own 7 cars.
b. skewed left
c. There are no values of 5.
d. skewed right
10. Sixty-four faculty members were asked the number of cars they owned (including spouse and children's cars). The results are given in the histogram. The third quartile is
a. 1
b. 2
c. 3
d. 0.75
|
