week 2 quiz PSY2007

  

Question 1 (1 point)
For a positively skewed distribution with a mode of X = 20 and a median of 25, what is the most likely value for the mean?
Question 1 options:
A. Greater than 25
B. Less than 20
C. Between 20 and 25
D. Cannot be determined from the information given
Question 2 (1 point)
What is the value of the median for the following set of scores? Scores: 1, 3, 4, 6, 8, 12, 13, 23, 25, 26
Question 2 options:
A. 7
B. 8
C. 10
D. 12.5
Question 3 (1 point)
What is the mode for the population of scores shown in the frequency distribution table?
X|f
5|1
4|2
3|3
2|4
1|2
Question 3 options:
A. 2
B. 3
C. 3.5
D. 4
Question 4 (1 point)
Which set of scores has the smallest standard deviation?
Question 4 options:
A. 11, 17, 31, 53
B. 5, 11, 42, 22
C. 145, 143, 145, 147
D. 27, 105, 10, 80
Question 5 (1 point)
Which of the following symbols identifies the population standard deviation?
Question 5 options:
A. s 
B. s2 
C. σ
D. σ 2
Question 6 (1 point)
Which of the following is a consequence of increasing variability?
Question 6 options:
A. The distance from one score to another tends to increase, and a single score tends to provide a more accurate representation of the entire distribution. 
B. The distance from one score to another tends to increase, and a single score tends to provide a less accurate representation of the entire distribution.
C. The distance from one score to another tends to decrease, and a single score tends to provide a more accurate representation of the entire distribution. 
D. The distance from one score to another tends to decrease, and a single score tends to provide a less accurate representation of the entire distribution. 
Question 7 (1 point)
Which of the following statements is true?
Question 7 options:
A. It is possible for a distribution to have two means.
B. It is possible for a distribution to have two medians.
C. It is possible for a distribution to have two modes.
D. It is possible for a distribution to have two medians or two modes.
Question 8 (1 point)
Which of the following symbols identifies the sample variance?
Question 8 options:
A. s
B. s2
C. σ 
D. σ 2 
Question 9 (1 point)
A researcher surveys a sample of n = 200 college students and asks each person to identify his or her favorite movie from the past year. If the results were presented in a frequency distribution graph, what kind of graph would be appropriate?
Question 9 options:
A. A histogram
B. A polygon
C. A histogram or a polygon
D. A bar graph
Question 10 (1 point)
For a perfectly symmetrical distribution with a median of 30, what is the value of the mean?
Question 10 options:
A. 30
B. Greater than 30
C. Less than 30
D. Cannot be determined from the information given
Question 11 (1 point)
A sample consists of n = 16 scores. How many of the scores are used to calculate the range?
Question 11 options:
A. 2
B. 4
C. 8
D. All 16 
Question 12 (1 point)
What is the total number of scores for the distribution shown in the following table?
X|f
4|3
3|5
2|4
1|2
Question 12 options:
A. 4
B. 10
C. 14 
D. 37 
Question 13 (1 point)
What is the median for the following set of scores? Scores:  1, 2, 6,  11, 17
Question 13 options:
A. 4
B. 6
C. 8.5 
D. 8
Question 14 (1 point)
A sample has a mean of M = 86. If one new person is added to the sample, what effect will it have on the sample mean?
Question 14 options:
A. The sample mean will increase.
B. The sample mean will decrease.
C. The sample mean will remain the same.
D. Cannot be determined from the information given
Question 15 (1 point)
For the following distribution of quiz scores, How many individuals had a score of X = 2?
X|f
5|6
4|5
3|5
2|3
1|2
Question 15 options:
A. 1
B. 3
C. 5
D. Cannot be determined
Question 16 (1 point)
A skewed distribution typically has _____ tail(s) and a normal distribution has ____ tail(s).
Question 16 options:
A. 1;  1 
B. 1;  2
C. 2;  1 
D. 2;  2 
Question 17 (1 point)
A biologist records the number of trout, bass, perch, and other types of fish caught in a local lake during a 2-week period. If the results are organized in a frequency distribution table, what values would be listed in the first column?
Question 17 options:
A. Frequencies
B. Different types of fish
C. The 14 days
D. The days of the week
Question 18 (1 point)
If a set of exam scores forms a symmetrical distribution, what can you conclude about the students scores?
Question 18 options:
A. Most of the students had relatively high scores.
B. Most of the students had relatively low scores.
C. About 50% of the students had high scores and the rest had low scores.
D. It is not possible to draw any conclusions about students’ scores.
Question 19 (1 point)
A population of n = 8 scores has SX = 40. What is the population mean?
Question 19 options:
A. 320
B. 20
C. 5
D. 0.2 
Question 20 (1 point)
What is the mode for the following sample of n = 8 scores? Scores:  0, 1, 1, 1, 2, 2, 3, 3
Question 20 options:
A. 1
B. 1.5
C. 13/8 = 1.625 
D. 3
Question 21 (1 point)
What kind of frequency distribution graph shows the frequencies as bars that are separated by spaces?      
Question 21 options:
A. A bar graph
B. A histogram 
C. A polygon
D. All of these
Question 22 (1 point)
A researcher surveys a sample of n = 200 college students and asks each person to identify his or her favorite movie from the past year. If the data were organized in a frequency distribution table, what would be listed in the first column?
Question 22 options:
A. A list of movies
B. A list of students
C. A list of frequencies
D. None of the other options is correct
Question 23 (1 point)
A distribution is positively skewed. Which is the most probable order, from smallest to largest, for the three measures of central tendency?
Question 23 options:
A. Mean, median, mode
B. Mode, median, mean
C. Mean, mode, median
D. Median, mean, mode
Question 24 (1 point)
The normal distribution is an example of
Question 24 options:
A. a histogram showing data from a sample.
B. a polygon showing data from a sample.
C. a bar graph showing data from a population.
D. a smooth curve showing data from a population.
Question 25 (1 point)
A sample of n = 5 scores has a mean of M = 12. What is SX for this sample?
Question 25 options:
A. 12/5 = 2.40
B. 5/12 = 0.417
C. 5(12) = 60
D. Cannot be determined from the information given

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