Question 1. The null hypothesis ____.
states that the treatment has no effect
states that there is an effect
is never used in psychological research
is always equal to 0.5
Question 2. Which of the following is a qualitative variable?
your height
your weight
your gender
your age
Question 3. What is the value of the median for the following set of scores-3, 5, 6, and 7?
5
5.5
6
54/8 = 7
Question 4. A sample consists of 16 scores. How many scores are used to calculate the range?
2
16
4
8
Question 5. After five points were added to each score in a distribution, the mean is calculated and found to be 30. What was the value of the mean for the original distribution?
25
30
35
cannot be determined from the information given
Question 6. A researcher is interested in the sleeping habits of American college. A group of 50 students is interviewed and the researcher finds that the students sleep an average of 6.7 hours per day. For this study, the 50 students are an example of a(n) _____.
parameter
statistic
population
sample
Question 7. A statistic is ____.
a value that describes an entire population.
a value that is always a positive number
a numerical value that describes a sample
a collection of variables
Question 8. Organizing a set of scores into a table or graph would be an example of using ____.
population statistics
sample statistics
descriptive statistics
inferential statistics
Question 9. In a frequency distribution graph, frequencies are presented on the ____, and the scores are listed on the ____.
X axis, Y axis
horizontal line, vertical line
Y axis, X axis
class interval, horizontal line
Question 10. A researcher is interested in the sleeping habits of American college students. A group of 50 students is interviewed and the researcher finds that the students sleep an average of 6.7 hours per day. For this study, the average of 6.7 hours is an example of a ____.
parameter
statistic
population
sample