PSY-3301 Chapter 5 MC Quiz (Set 10)
Question 1
5 out of 5 points
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A distribution of raw scores is positively skewed. You want to transform it so that it is normally distributed. Your friend, who fancies herself a statistics whiz, advises you to transform the raw scores to z scores; that the z scores will be normally distributed. You should _________.
Question 2
5 out of 5 points
A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38.
The percentage of scores that lie between $9.00 and $10.00 is _________.
Question 3
5 out of 5 points
Makaela took a Spanish exam; her grade was 79. The distribution was normally shaped with = 70 and s = 12. Juan took a History exam; his grade was 86. The distribution was normally shaped with = 80 and s = 8. Which did better on their exam relative to those taking the exam?
Question 4
5 out of 5 points
In a normal curve, the inflection points occur at _________.
Question 5
0 out of 5 points
The standard deviation of the z distribution equals _________.
Question 6
5 out of 5 points
You have just received your psychology exam grade and you did better than the mean of the exam scores. If so, the z transformed value of your grade must
Question 7
5 out of 5 points
A distribution has a mean of 60.0 and a standard deviation of 4.3. The raw score corresponding to a z score of -1.51 is _________.
Question 8
5 out of 5 points
In a normal distribution the z score for the mean equals _________.
Question 9
5 out of 5 points
Given the following set of sample raw scores, X: 1, 3, 4, 6, 8. What is the z transformed value for the raw score of 3?
Question 10
5 out of 5 points
A testing bureau reports that the mean for the population of Graduate Record Exam (GRE) scores is 500 with a standard deviation of 90. The scores are normally distributed.
The percentile rank of a score of 667 is _________.
Question 11
5 out of 5 points
An economics test was given and the following sample scores were recorded:
Individual
A
B
C
D
E
F
G
H
I
J
Score
12
12
7
10
9
12
13
8
9
8
The z score for individual E is _________.
Question 12
5 out of 5 points
A testing service has 1000 raw scores. It wants to transform the distribution so that the mean = 10 and the standard deviation = 1. To do so, _________.
Question 13
5 out of 5 points
A distribution has a mean of 60.0 and a standard deviation of 4.3. The raw score corresponding to a z score of 0.00 is _________.
Question 14
5 out of 5 points
The proportion of scores less than z = 0.00 is _________.
Question 15
5 out of 5 points
You have just taken a standardized skills test designed to help you make a career choice. Your math skills score was 63 and your writing skills score was 45. The standardized math distribution is normally distributed, with m = 50, and s = 8. The writing skills score distribution is also normally distributed, with m = 30, and s = 10. Based on this information, as between pursuing a career that requires good math skills or one requiring good writing skills, you should chose _________.
Question 16
5 out of 5 points
How much would your income be if its z score value was 2.58?
Question 17
5 out of 5 points
A set of raw scores has a rectangular shape. The z transformed scores for this set of raw scores has a _________ shape.
Question 18
5 out of 5 points
A stockbroker has kept a daily record of the value of a particular stock over the years and finds that prices of the stock form a normal distribution with a mean of $8.52 with a standard deviation of $2.38.
What percentage of the distribution lies below $7.42.
Question 19
5 out of 5 points
The z score corresponding to the mean of a raw score distribution equals _________.
Question 20
5 out of 5 points
A testing bureau reports that the mean for the population of Graduate Record Exam (GRE) scores is 500 with a standard deviation of 90. The scores are normally distributed.
The proportion of scores that lie above 650 is _________.