Question

1. school administrators wondered whether class - size and grade achievement (in percent) were related. a random sample of classes revealed the following data. are the variables linearly related? class - size and grades

Explanation:

Step1: Observe the scatter - plot

Examine the general trend of data points.

Step2: Analyze the trend

If data points seem to form a line sloping upwards, it's a positive linear relationship; if sloping downwards, negative linear; if no clear line - like pattern, no relationship; if curved, non - linear. In this scatter - plot, as class size increases, grade achievement seems to decrease. The data points roughly form a line sloping downwards.

Answer:

Negative linear relationship