The scatterplot in Fig. 18 compares the temperatures and relative humidities in Seattle, Washington, for approximately every hour, from 12:53 a.m. to 11:53 p.m. on June 1, 2014.

a. There were 24 pairs of temperatures and relative humidities recorded. Why are there only 19 dots in the scatterplot?
b. Identify the explanatory and response variables.
c. Is the association positive, negative, or neither? What does that mean in this situation?
d. On the basis of the scatterplot, a student concludes that the relative humidity generally decreased throughout the day. What would you tell the student?
e. The temperature decreased from 12:53 a.m. to 4:53 a.m. Did the humidity generally increase or decrease in that period? Explain.

Temperature versus Relative Humidity 80 70 60 50 40 55 0 65 70 75 80 Temperature Fahrenheit degrees