1. If the standard deviation equals 0, we may concludethat:
a. There is no dispersion in the data
b. The mean is a good measure of the average
c. The data are homogeneous
d. Everyone scored the same
e. All of the above are correct
2. Distribution A and B have the same mean and range. Thestandard deviation of Distribution A is 30, and of Distribution Bis 15. We may conclude that:
a. The scores in Distribution B are grouped closer to the meanthan are the scores in Distribution A.
b. The scores in Distribution A are grouped closer to the meanthan the scores in Distribution B.
c. There are twice as many scores from -1 standard deviationto +1 standard deviation in Distribution A
d. There are half as many scores from -1 standard deviation to+1 standard deviation in Distribution A.
e. Distribution A has at least one lower and one higher scorethan Distribution B
3. In a given distribution the mean = 80, standard deviation =10. If three scores are added, namely, 70, 80, and 90, then thisaddition of data will cause the standard deviation to
a. Decrease in value
b. Increase in value
c. Remain the same
d. Unable to determine
4. On a statistics examination, an instructor finds that thestandard deviation = 20.0 in an undergraduate class and 10.0 in agraduate seminar. Both groups have the same number of students.Which of the following statements is warranted?
a. Undergraduates performed better than graduatestudents
b. The distribution of the undergraduate students isnormal
c. The performance of undergraduates is more variable thangraduate students
d. The average performance for undergraduates is higher thanfor graduates
e. Cannot say unless we know the means
5. You obtain a score of 80 on a test. Which class would yourather be in?
a. Mean = 60, standard deviation = 20
b. Mean = 70, standard deviation = 15
c. Mean = 70, standard deviation = 10
d. Mean = 80, standard deviation = 2
e. Mean = 70, standard deviation = 2
6. The College of Arts and Science at Delta University hasseveral departments. The number of faculty in each department isshown below. What is the MEDIAN number of faculty in eachdepartment in the College of Arts and Science? 8, 16, 10, 14, 8,18, 12, 10, 6, 18
a. 12
b. 10
c. 11
d. 10.5
e. There is no median in this data
7. The College of Arts and Science at Delta University hasseveral departments. The number of faculty in each department isshown below. What is the MEAN number of faculty in each departmentin the College of Arts and Science? 8, 16, 10, 14, 8, 18, 12, 10,6, 18
a. 10
b. 10.5
c. 11
d. 12
e. There is no mean in this data
8. A graph that shows how often each value in a distributionwas observed is called a
a. x-y graph
b. frequency distribution
c. measure of dispersion
d. variance
9. An example of an ordinal scale is
a. The numbers on basketball players jerseys
b. The weight of students in this class
c. The number of students in each program in CER
d. The ranking of basketball teams for March Madness
e. The temperature in degrees Fahrenheit
10. The salaries of employees at your company were given as$30,000; $50,000; $55,000; $20,000; $60,000; and $250,000, themeasure of central tendency that best explains how much money youremployees make is
a. Mean
b. Median
c. Mode
d. Variance
11. You stand at the door of a high school and survey thestudents entering about their attitudes toward adminstrators. Thistype of sampling is called
a. Simple random sampling
b. Convenience sampling
c. Cluster sampling
d. Probability sampling
12. A problem with gathering data at a door of a college dormis
a. Only a certain type or types of students might use thatdoor, e.g. freshman
b. All the disabled students might use that door since it hashandicapped access
c. You may not get enough students to have a good samplesize
d. All of the above
13. When you have a sample whose frequency distribution looksbasically like a normal curve, you know that
a. There is no way to determine what percentage of thepopulation would fall in each section
b. Its highest point is in the middle, showing that mostpeople are “average.”
c. It is not symmetrical
d. You can only use very limited and complicated statistics toanalyze your data
