What does it mean to say two variables are positively associated? Negatively associated?

"In studies of monozygotic (identical) twins, the correlation between intelligence (IQ) scores is 0.85.

a. Who are the individuals in this study?"

Why is it important to perform graphical as well as analytical analyses when analyzing relations between two quantitative variables?

What is the difference between univariate data and bivariate data?

The variable is the variable whose value can be explained by the value of the explanatory variable.

True or False: Correlation implies causation.

"[DATA] Influential Observations Zillow.com is a site that can be used to assess the value of homes in your neighborhood. The organization provides a list of homes for sale as well as a Zestimate, which is the price Zillow believes the home will sell for. The following data represent the Zestimate and sale price (in thousands of dollars) of a random sample of recently sold homes in Charleston, South Carolina.

a. Draw a scatter diagram of the data, treating the Zestimate as the explanatory variable and sale price as the response variable."

Suppose you work a part-time job and earn \$15 per hour. Draw a scatter diagram that might represent the relation between your gross pay and hours worked. Is this a deterministic relation or a probabilistic relation?