11. Correlation

Scatterplots & Intro to Correlation

Multiple Choice
In the context of scatterplots and correlation, which statement best describes how correlation and causation differ?
49
views
Textbook Question
Exercises 1–10 are based on the following sample data consisting of costs of dinner (dollars) and the amounts of tips (dollars) left by diners. The data were collected by students of the author.
[IMAGE]
Scatterplot Construct a scatterplot and comment on the pattern of points.
179
views
Multiple Choice
A scatterplot shows that as the values of variable $X$ increase, the values of variable $Y$ also tend to increase. Which of these statements does the graph support?
127
views
Multiple Choice
Which table of paired values $(x, y)$ shows a negative correlation between $x$ and $y$ ?
55
views
Multiple Choice
In the context of a scatterplot and correlation, what does it mean when the slope of a line (or the slope between two points) is undefined?
56
views
Multiple Choice
For the scatter diagram shown here, which of the following best describes the relationship between the two variables if the points form a pattern that slopes upward from left to right?
85
views
Multiple Choice
Which of the following best describes a scatterplot and its primary use in statistics?
81
views
Multiple Choice
Which of the following best describes a scatterplot and its primary use in statistics?
95
views
Multiple Choice
In the context of scatterplots, how many variables are typically displayed on a standard scatterplot?
91
views
Multiple Choice
Given a scatterplot showing a positive linear relationship between hours studied and exam scores, which statement is an inference that can be made by using the graph?
81
views
Multiple Choice
In a scatterplot, which of the following Pearson correlation coefficients represents the weakest linear correlation?
46
views
Multiple Choice
In general, which statement about correlation is correct when deciding whether a relationship is causal?
51
views
Multiple Choice
In a scatterplot, which description best represents a strong negative correlation?
50
views
Multiple Choice
In the context of scatterplots, correlation occurs when which of the following is true about two variables?
50
views
Multiple Choice
True or false: If the correlation between two variables is strong, then changes in one variable cause changes in the other (i.e., correlation implies causation).
69
views