question archive A scatterplot shows a set of data points that are clustered very close to a line that slopes down from the upper left corner to the bottom right corner
A scatterplot shows a set of data points that are clustered very close to a line that slopes down from the upper left corner to the bottom right corner
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A scatterplot shows a set of data points that are clustered very close to a line that slopes down from the upper left corner to the bottom right corner. Which of the following values would be closest to the correlation for these data?
-0.20
-0.80
+0.20
+0.80
Which of the following is a characteristic of a correlational study? In other words, which is a characteristic of a non-experiment?
participants are randomly assigned to groups
participants receive some sort of treatment or intervention
none of the other options is a characteristic of a correlational study
For the following data, r equals ____.
Hint: Use a spreadsheet and the =PEARSON() formula.
X
2
4
5
2
Y
3
5
2
5
-0.75
-0.83
1
0.75
Dr. Huitema reported the results of a test on Pearson's r as r(50) = .40, p = .003, two-tailed. If he set alpha = .05, what decision should did he make about the null hypothesis?
Fail to reject
Not enough information to decide.
Reject
For which of the following correlations would the data points be clustered most closely around a straight line?
There is no relationship between the correlation and how close the data points are to the line.
r = 0.10
r = -0.85
r = 0.50
A linear regression equation has b = 2 and a = 3. What is the predicted value of Y (called "Y-hat") for X = 8?
Y-hat = 26
cannot be determined without additional information
Y-hat = 19
Y-hat = 5
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Question 1
Values tending to 1 implies that the values are closer to the line while values farther from one implies values farther from the line
A correlation value of +0.80 shows that the values are the closest to the line.
Answer is 0.80
Option D
Question 2
A correlational study is a type of research design where a researcher seeks to understand what kind of relationships naturally occurring variables have with one another.
Groups of data set are needed to perform this study
Answer is participants are randomly assigned to groups
Option A
Question 3
This question was solved using Microsoft Excel
Kindly find attachment below for the detailed solution and explanation.
From excel, r is -0.4074
None of the option is correct
Question 4
To make a decision in hypothesis testing via the p value method, we compare the p value and the level of significance
If p > level of significance, accept null hypothesis
if p < level of significance, reject null hypothesis
0.003 is lesser than 0.05, hence we reject the null hypothesis
Question 5
The data will cluster around the line at a value of correlation that is the highest (negative or positive)
Answer is r = -0.85
Question 6
y = ax + b
a = 3 and b = 2
find y when is 8
y = 3x + 2
y = 3(8) + 2
y = 24 + 2
y = 26
Please see the attached file for the complete solution
