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Identify each of the following as examples of nominal, ordinal, interval, or ratio scales of measurement. (4 points each)
 A poll of registered voters in Florida asking which candidate they support
 The length of time required for a wound to heal when using a new medicine
 The number of telephone calls arriving at a switchboard per fiveminute period
 The distance firstyear college football players can kick a ball
 Mental health diagnoses present in an elderly population
 The rankings of employees on their job performance
(Points : 24)
Question 2. 2.
Two hundred raffle tickets are sold. Your friend has five people in
her family who each bought two raffle tickets. What is the probability
that someone from her family will win the raffle?
(Points : 4)

Question 3. 3. Jolie has 45 minutes to do her
statistics homework. If the mean is 38 minutes and the standard
deviation is 3, calculate Jolie’s z score. Once calculated, interpret
your findings in terms of Jolie’s performance. (HINT: use the normal distribution and the probability that other students performed better or worse.) (Points : 8)

Question 4. 4. A psychologist measures units of
change for a memory test after students are given an opportunity to
sleep only four hours. The following change units were obtained: 7, 12,
4, 7, 3, 10. Find the a) mean, b) median, c) mode, d) standard
deviation, e) range, and f) variance. (Points : 24)

Question 5. 5. A student scored 81 on a chemistry
test and 75 on a history test. For the chemistry test, the mean was 70
and the standard deviation was 20. For the history test, the mean was 65
and the standard deviation was 8. Did the student do better on the
chemistry test or the history test? Explain your answer. (Points : 12)

Question 6. 6. Suppose you want to figure out what
to do with your degree in psychology. You ask some fellow students from
your psychology program who recently graduated to find out what they are
doing with their degree and how much it pays. What type of sampling is
this? What are the limitations of this sampling approach? (Points : 8)

Question 7. 7. Variables in which the values are categories are known as (Points : 4) 
Interval variables Nominal variables Ordinal variables Ratio variables 
Question 8. 8. Before the researcher can conduct a statistical test, the research question must be translated into (Points : 4) 
A testable hypothesis Additional observations
Mathematical symbols
Numbers 
Question 9. 9. The hypothesis stating that there are no differences, effects, or relationships is (Points : 4) 
The alternative hypothesis
The baseline hypothesis
The null hypothesis
The reasonable hypothesis 
Question 10. 10. A group of students made the
following scores on a 10item quiz in psychological statistics: {5, 6,
7, 7, 7, 8, 8, 9, 9, 10, 10} What is the mean score? (Points : 4) 
6.6
7.2
7.8
8.7 
Question 11. 11. A group of students made the
following scores on a 10item quiz in psychological statistics: {5, 6,
7, 7, 7, 8, 8, 9, 9, 10, 10} What is the median score? (Points : 4) 
6 7 8 9 
Question 12. 12. A group of students made the
following scores on a 10item quiz in psychological statistics: {5, 6,
7, 7, 7, 8, 8, 9, 9, 10, 10} What is the mode? (Points : 4) 
5 7 8 9 
Question 13. 13. A group of students made the
following scores on a 10item quiz in psychological statistics: {5, 6,
7, 7, 7, 8, 8, 9, 9, 10, 10} What is the range of scores? (Points : 4) 
5 6 7 11 
Question 14. 14. A group of students made the
following scores on a 10item quiz in psychological statistics: {5, 6,
7, 7, 7, 8, 8, 9, 9, 10, 10} What is the variance, treating these scores
as a sample? (Points : 4) 
1.53 1.60
2.33
2.56 
Question 15. 15. The standard normal distribution has all the following properties EXCEPT: (Points : 4) 
The mean, mode, and median are all equal
The total area under the curve equals 1
The curve is specified by two parameters, the mean and the standard deviation
The curve extends to + and 3 standard deviations from the mean 
Question 16. 16. According to the Empirical Rule,
approximately _______% of the data in a normal distribution will fall
within 1 standard deviation of the mean. (Points : 4) 
34 68
95
99.7 
Question 17. 17. In statistical computations, the number of values that are free to vary is known as (Points : 4) 
Degrees of freedom
Freedom factor
Variability index
Variation quotient 
Question 18. 18. Which of the following reflects a Type I error? (Points : 4) 
Rejecting the null hypothesis when in reality the null hypothesis is true
Rejecting the null hypothesis when in reality the null hypothesis is false
Accepting the null hypothesis when in reality the null hypothesis is true
Accepting the null hypothesis when in reality the null hypothesis is false 
Question 19. 19. Which type of sampling is used
when the experimenter asks 5 area doctors to refer pregnant women to his
study and accepts all women who offer to be in his study? (Points : 4) 
purposive sampling
convenience sampling
cluster sampling
stratified sampling 
Question 20. 20. In our statistics equations, n refers to: (Points : 4) 
mean
standard deviation
normal distribution
number of subjects 
Question 21. 21. Which of the following is true regarding alpha? (Points : 4) 
it is also known as the level of significance value is set by the researcher
value is equal to the probability of a type I error
all of the above are true 
Question 22. 22. Macy proposes that boys who play
sports are viewed as more attractive than boys who do not play sports.
What is her null hypothesis? (Points : 4) 
Boys who play sports are not viewed as more attractive than boys who do not play sports
Playing sports will influence how attractively boys are viewed
Boys who play sports are more attractive than girls who play sports
There can be no null hypothesis 
Question 23. 23. You calculate a t of 2.38 and note
that the tabled value for .01 is 3.22 and for .05 is 2.19. You would
conclude that the null hypothesis can be: (Points : 4) 
Accepted at the .05 level
Rejected at the .01 level
Rejected at the .05 level
None of the above 
Question 24. 24. A researcher is studying political
conservatism among 11 engineering students and 11 humanities students.
The number of degrees of freedom for a t test is: (Points : 4) 
22
20
11
10 
Question 25. 25. A t test for dependent groups should be used instead of a t test for independent samples: (Points : 4) 
If each participant is measured twice Whenever there are equal numbers of subjects in each group Whenever there are only two groups All of the above 
Question 26. 26. In a normal distribution, what percent of the population falls within one and two standard deviations of the mean? (Points : 4) 
34% 68% 95% cannot tell from the information given 
Question 27. 27. Which of the following is more affected by extreme scores? (Points : 4) 
Mode
Mean
Median
None of the above are affected 
Question 28. 28. On a histogram, what does the vertical (y) axis refer to? (Points : 4) 
Individual scores
Frequencies
Means
Deviation scores 
Question 29. 29. Which statistic refers to the average amount by which the scores in the sample deviate from the mean? (Points : 4) 
Range Standard deviation
Median
Mode 
Question 30. 30. Assume a normal distribution for N
= 300. How many cases would one expect to find between +1 and 1
standard deviations around the mean? (Points : 4) 
102
285
150
204