Question

Participant # |
Hours Spent on Social Media (per day) |
Self-Esteem (on a scale of 1-10) |

1 |
0 |
9 |

2 |
0 |
7 |

3 |
1 |
6 |

4 |
1 |
7 |

5 |
1 |
8 |

6 |
2 |
5 |

7 |
2 |
6 |

8 |
2 |
7 |

9 |
3 |
3 |

10 |
3 |
4 |

11 |
3 |
5 |

12 |
4 |
3 |

13 |
4 |
4 |

14 |
5 |
3 |

15 |
5 |
4 |

16 |
5 |
5 |

17 |
6 |
5 |

18 |
7 |
4 |

19 |
8 |
4 |

20 |
9 |
3 |

1). Calculate the specific correlation coefficient for this
data. What does r_{xy} = ? You can use the table on the
last page for your calculations (This is the tough one).

2). Does there appear to be a correlation between these two variables? If yes, in what direction (positive or negative)?

3). What are three possible explanations for this correlational relationship? (Note – These can include “third variable” explanations).

Answer #1

One of the most widely administered psychological assessments is
the Rosenberg Self-Esteem Scale (1965), a 10-item scale that
assesses global self-worth by measuring both positive and negative
feelings about the self. Scores on this standardized self-esteem
questionnaire range from 10-100, with higher scores indicating
higher levels of self-esteem. For the general population of
American teenagers, the average score is 50 points (SD = 15
points).
Childhood participation in organizations such as sports,
cultural groups, religious groups, and school clubs may...

Time spent indoors (hours)
3
5
6
9
10
9
8
10
10
12
13
11
16
11
7
8
18
13
12
13
1.Can you calculate z-scores for each of the raw scores above?
If so, please calculate the z-score for a kid who reported spending
8 hours indoors.
2. if you transformed the variable “time spent indoors” from an
X-scale to a z-scale, what would be the new mean of the
distribution? What would be the new standard...

A psychologists wants to know if black mothers' self-esteem mean
score is higher than their community average of 10, with standard
deviation equal to 4. A sample of thirteen black mothers were
selected at random and their self-esteem scores are recorded
below:
15, 13, 5, 9. 10. ,15. 14. 15. 9. 12. 13. 12 14.
a. Calculate the mean self-esteem score for the sample (3)
b. State the alternative and null hypotheses (2)
c. State the hypothesis test you will...

Please type answer...
Researchers wanted to explore self-esteem in adolescent boys and
adolescent girls. Each respondent completed a 10-item self-esteem
scale (they chose one rating for each item from a Likert-type
scale, 1 = strongly disagree and 5 = strongly agree). The sum of
the 10 ratings was each respondent's self-esteem score. Their
results were: t = 2.01, d = .90 (40 girls, 40 boys).
Use the scenario presented above to answer the following
questions:
1. What statistical
test did...

A researcher wanted to learn whether the number of alcoholic
beverages consumed per week was associated with scores on a health
attitude scale. So the researcher gathered 10 random people.
Participants were asked how many drinks they have per week, and to
complete a health attitudes scale (1-10). High scores on the scale
reflect positive attitudes to health and low scores reflect poor
attitudes to health. Using the data below, an alpha of .05
(two-tailed), use a Pearson correlation to...

A researcher measures the relationship between Internet use
(hours per week) and social interaction (hours per week) in a
sample of 10 students. The following table lists the hypothetical
results of this study.
Internet
Use
Social
Interaction
X
Y
6
4
7
5
5
7
8
5
13
4
3
6
3
4
6
6
2
9
10
4
(a) Compute the Pearson correlation coefficient. (Round your
answer to three decimal places.)
(b) Compute the coefficient of determination. (Round your...

Use the given data set to complete parts? (a) through? (c)
below.? (Use alphaequals?0.05.) x 10 8 13 9 11 14 6 4 12 7 5 y 9.14
8.13 8.75 8.77 9.26 8.11 6.13 3.11 9.13 7.27 4.74 LOADING... Click
here to view a table of critical values for the correlation
coefficient. a. Construct a scatterplot. Choose the correct graph
below. A. 0 4 8 12 16 0 2 4 6 8 10 x y A scatterplot has a
horizontal...

Two persons taste 10 red Italian wines, grading them by an
ordinal scale between 1 and 5. The results
are as follows:
Grades Grades
Wine No. Person 1 Person 2
1 1 2
2 2 3
3 4 5
4 5 4
5 2 2
6 2 2
7 4 3
8 3 4
9 1 3
10 4 2
(a) Find the Spearman’s rank correlation by
i. the definition;
ii. using the formula
rs = 1 − 6(sum of...

To compare the effectiveness of a media campaign - via radio
ads, billboards, and ads on social media websites - to reduce the
incidence of impaired driving, a police chief inspected data from
60 randomly chosen CheckStops at varying locations. Thirty of these
were before the launch of this campaign, 30 were after the media
campaign had been running for a months time. Use α=0.05 for all
calculations. For each CheckStop randomly chosen, the number of
people charged with impaired...

A researcher measures the relationship between Internet use
(hours per week) and social interaction (hours per week) in a
sample of 10 students. The following table lists the hypothetical
results of this study. Internet Use Social Interaction X Y 6 5 8 7
4 7 7 7 12 5 5 8 3 2 5 4 2 9 12 2 (a) Compute the Pearson
correlation coefficient. (Round your answer to three decimal
places.) (b) Compute the coefficient of determination. (Round your...

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