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Terms in this set (10)
The correlation coefficient, r, is a number between
-1 and 1
Choose the most appropriate completion of the sentence.
In order to indicate a strong correlation between variables, the correlation coefficient will be
near -1 or 1
Match each scatterplot shown below with one of the four specified correlation coefficients.
- c (-0.26) ?
- a (-0.04) ?
- b (0.93)
-d (-1.00)
You generate a scatter plot using Excel. You then have Excel plot the trend line and report the equation and the r^2 value. The regression equation is reported as
y= 29.95x + 41.87
and the r^2 =
0.4761
What is the correlation coefficient for this data set?
r =
.69
Based on the data shown below, calculate the correlation coefficient (to three decimal places)
r =
-.924
Here is a bivariate data set.
Find the correlation coefficient and report it accurate to three decimal places.
r =
.519
Using your favorite statistics software package, you generate a scatter plot with a regression equation and correlation coefficient. The regression equation is reported as
y = -15.58x + 34.57
and the r = -.53
What proportion of the variation in y can be explained by the variation in the values of x?
r^2 = %
Report answer as a percentage accurate to one decimal place.
28.1
Here is a bivariate data set.
Find the correlation coefficient and report it accurate to three decimal places.
r =
What proportion of the variation in y can be explained by the variation in the values of x? Report answer as a percentage accurate to one decimal place.
r^2 =
r = .643
r^2 = 41.4
The following bivariate data set contains an outlier.
What is the correlation coefficient with the outlier?
rw =
What is the correlation coefficient without the outlier?
rwo =
Does including the outlier change the linear correlation by at least 0.10?
rw = -.927
rwo = -. 168
Yes. Including the outlier changes the linear correlation by at least 0.10.
Recently a community college offered a 2-credit course to help students with math anxiety. At the beginning of the course, each student took a 30-question survey (called MARS-S); the higher the score, the more anxiety experienced by the student. The nine students remaining in the class took the same survey at the end of the course. The before and after scores for each of the nine students who completed the course are shown below.
Compute the correlation between before and after scores for these students. (Assume the correlation conditions have been satisfied and round your answer to the nearest 0.001.)
0.588
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Verified questions
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**Solve each equation.** $15=-3(2 q-1)$
Verified answer
algebra
For the Bingo card below, suppose that a combination of a column letter and a row number, such as B1, represents an input and the number at that location, such as 7, represents an output. $$ \begin{matrix} \text{B} & \text{I} & \text{N} & \text{G} & \text{O}\\ \text{7} & \text{26} & \text{35} & \text{51} & \text{73}\\ \text{14} & \text{23} & \text{44} & \text{55} & \text{63}\\ \text{6} & \text{19} & \text{FREE} & \text{48} & \text{64}\\ \text{12} & \text{22} & \text{32} & \text{54} & \text{70}\\ \text{11} & \text{16} & \text{33} & \text{47} & \text{69}\\ \end{matrix} $$ What output corresponds to 12?
Verified answer
calculus
Find each limit. $\lim _{x \rightarrow \infty} \frac{x^{4}+x^{3}}{e^{x}+1}$
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Evaluate each polynomial for x = 4 and y = 10. $$ y-x^2 $$
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