A line of best fit is $y = 7x + 25$. What does the slope $7$ represent?

The predicted change in $y$ per one-unit increase in $x$

A correlation coefficient of $r = -0.88$ indicates:

A strong negative linear relationship

A lurking variable (hot weather) drives both

12questions. Pick an answer and you'll see why right away.

A data set has the five-number summary $4, 9, 13, 18, 26$ . What is the interquartile range?
What is the range of the data set $4, 9, 13, 18, 26$ ?
Find the median of $6, 2, 9, 4, 13$ .
A distribution has a long tail toward low values. Its shape is:
Which center is most representative for a data set with a large outlier?
In a survey of $100$ people, $40$ both own a bike and commute. What is this joint relative frequency?
Of $50$ bike owners, $40$ commute. What is this conditional relative frequency?
The totals in the margins of a two-way table are called:
A line of best fit is $y = 7x + 25$ . What does the slope $7$ represent?
Using the line of best fit $y = 3x + 10$ , predict $y$ when $x = 8$ .
A correlation coefficient of $r = -0.88$ indicates:
Ice cream sales and drowning rates are highly correlated. The best explanation is: