Question

In: Statistics and Probability

1. The scores of 10 people on standardized scales of introversion and shyness are shown below...

1. The scores of 10 people on standardized scales of introversion and shyness are shown below (high scores on each scale indicate high introversion and high shyness)

Person

Introversion

Shyness

1

17

22

2

6

4

3

12

10

4

13

8

5

19

11

6

20

18

7

9

10

8

4

3

9

8

10

10

21

16

a. Make a scatterplot of the data. What is the type of relationship?

b. compute r and test it for significance? How much of the variability is accounted for by r?

c. Compute the regression equation for Y’

d. Use the equation to predict the shyness score of a person with an introversion score of 15

2. A group of students was asked to estimate the amount of time each spend per day reading the newspaper. Then each student was given a 20-item recognition test of current events. The paired scores are:

Student

Time in minutes

Score

A

25

12

B

40

13

C

55

18

D

10

8

E

5

5

F

5

3

G

30

10

H

45

15

a. Compute r and test it for significance? How much of the variability is accounted for by r?

c. Compute the regression equation for Y’

Solutions

Expert Solution

orchestra answered 2 years ago
Next > < Previous

Related Solutions

1. The scores of 10 people on standardized scales of introversion and shyness are shown below...
1. The scores of 10 people on standardized scales of introversion and shyness are shown below (high scores on each scale indicate high introversion and high shyness) Person Introversion Shyness 1 17 22 2 6 4 3 12 10 4 13 8 5 19 11 6 20 18 7 9 10 8 4 3 9 8 10 10 21 16 a. Make a scatterplot of the data. What is the type of relationship? b. compute r and test it for...
nn psychology students took a standardized test. The scores are summarized in the GFDT below.       Scores      ...
nn psychology students took a standardized test. The scores are summarized in the GFDT below.       Scores          Frequency    220 - 224 14 225 - 229 15 230 - 234 16 235 - 239 240 - 244 17 245 - 249 40 The scores are also described in the cumulative table shown below.       Scores          Frequency    less than 225 14 less than 230 29 less than 235 45 less than 240 63 less than 245 80 less than 250 nn What is the...
For each of the scales shown below (A, B, and C), answer the following questions: What...
For each of the scales shown below (A, B, and C), answer the following questions: What type of data is being collected? What level of scale measurement is being used? What is the most appropriate measure of central tendency? What is the most appropriate measure of dispersion? What weakness, if any, exists with the scale? A. How do you pay for your travel expenses? Cash , Company , charge , Check , Personal charge , Credit card , Other B....
The following are standardized cognitive scores for n=8 younger people and n=8 older people: Younger Older...
The following are standardized cognitive scores for n=8 younger people and n=8 older people: Younger Older 8 7 6 5 6 8 7 5 8 7 7 6 8 8 8 5 Calculate SS, variance, and standard deviation for both sets of people. Which group is more consistent? (less variability)
IQ scores are standardized such that the population of scores has a mean of 100 and...
IQ scores are standardized such that the population of scores has a mean of 100 and a variance of 225. Assuming IQ scores have a normal distribution, what proportion of scores will fall below 80? What proportion will fall below 75? What values occur in the top 9% of the distribution? What values occur in the bottom 9% of the distribution?
5. The Mental Development Index (MDI) of the Bayley scales of Infant development is a standardized...
5. The Mental Development Index (MDI) of the Bayley scales of Infant development is a standardized measure used in studies with high risk infants. It has an approximately normal distribution with a mean of 100 and a standard deviation of 16. a. What proportion of infants have an MDI of at least 120? b. What proportion of infants have an MDI of less than 70? c. What proportion of infants have an MDI between 84 and 116? Now find the...
An IQ test has scores converted to Z scores. What % of people fall below a...
An IQ test has scores converted to Z scores. What % of people fall below a z = -2? Group of answer choices 2.28% 47.7% 97.7% 2%
1) Scores for a common standardized college aptitude test are normally distributed with a mean of...
1) Scores for a common standardized college aptitude test are normally distributed with a mean of 495 and a standard deviation of 108. Randomly selected men are given a Test Preparation Course before taking this test. Assume, for sake of argument, that the preparation course has no effect. If 1 of the men is randomly selected, find the probability that his score is at least 551.9. P(X > 551.9) =   Enter your answer as a number accurate to 4 decimal...
If the quality of teaching is similar in a school, the scores on a standardized test...
If the quality of teaching is similar in a school, the scores on a standardized test will have a standard deviation of 15. The superintendent wants to know if there is a disparity in teaching quality, and decides to investigate whether the standard deviation of test scores has changed. She samples 26 random students and finds a mean score of 152 with a standard deviation of 5.7079. Is there evidence that the standard deviation of test scores has decreased at...
Computation of z-scores and standardized scores You are a school psychologist and have been asked to...
Computation of z-scores and standardized scores You are a school psychologist and have been asked to administer a verbal intelligence test to a local senior high school English class to assess writing preparedness of the class. You have been given the mean (μ = 70) and population standard deviation (σ = 8) for the raw scores from this test. Based on the testing manual, you know that the developers of this assessment generate a standardized score using a predetermined mean...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT