Question: The scatterplot and the model in Fig. 133 compare the years and the median square footages of newly built homes. a. Is the association positive,

The scatterplot and the model in Fig. 133 compare the years and the median square footages of newly built homes.

a. Is the association positive, negative, or neither? What does that mean in this situation?
b. Estimate the slope of the model. What does it mean in this situation?
c. Estimate how much the median square footage increased over 15 years.
d. A student says the result you found in part (c) describes how much the median square footage will increase in the next 15 years. What would you tell the student?
e. The mean sizes of all types of households were 2.7 people and 2.5 people in 1982 and 2013, respectively. Estimate the median square footage per person for newly built homes in 1982. Do the same for 2013 and then compare your two results. Describe any assumptions you have made.

Years versus Square Footages 2600 2400 2200 2000 1800 1600 1400 1980 1985 1990 1995 2000 2005 2010 2015 Year

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