Questions from Essentials of Statistics

Q: y = −3x a. find the y-intercept

y = −3x a. find the y-intercept and slope. b. determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation. c. use two points to graph the equation.

Q: Fill in the blanks: 1. The symbol that is

Fill in the blanks: 1. The symbol that is used for the linear correlation coefficient is ____. 2. A value of r close to ±1 indicates that there is a ___ linear relationship between the variables. 3. A...

Q: Determine whether r is positive, negative, or zero.

Determine whether r is positive, negative, or zero.

Q: When the behavior of the interviewer or respondent results in inaccurate responses

When the behavior of the interviewer or respondent results in inaccurate responses, we have response bias. a. Explain why a survey question “Do you smoke marijuana” might result in response bias? b. P...

Q: Determine whether r is positive, negative, or zero.

Determine whether r is positive, negative, or zero.

Q: y = 1.5x a. find the y-

y = 1.5x a. find the y-intercept and slope. b. determine whether the line slopes upward, slopes downward, or is horizontal, without graphing the equation. c. use two points to graph the equation.

Q: Determine whether r is positive, negative, or zero.

Determine whether r is positive, negative, or zero.

Q: Answer true or false to the following statement and provide a reason

Answer true or false to the following statement and provide a reason for your answer: If there is a very strong positive correlation between two variables, a causal relationship exists between the two...

Q: The linear correlation coefficient of a set of data points is 0

The linear correlation coefficient of a set of data points is 0.846. a. Is the slope of the regression line positive or negative? Explain your answer. b. Determine the coefficient of determination.

Q: The coefficient of determination of a set of data points is 0

The coefficient of determination of a set of data points is 0.709 and the slope of the regression line is −3.58. Determine the linear correlation coefficient of the data.