1. You want to investigatewhether there is a relationship between age and amount of weight lost in a group of 45 women participating in a 12-week diet program.

What would be the response variable in this situation?

What would be the explanatory variable in this situation?

2. The following linear regresion equation represents 18 brown trout caught in a local river. The fish were measured (inches) and weighed (ounces) before they were released back into the river.

Weight^=-2.28+1.20Length

-Explain in a short sentence that interprets the slope.

3. A city's transportation department is interested in exploring the relationship between the outside temperature and the number of passengers that ride the bus line to better serve their customers. The manager recorded the temperature at the beginning of the hour and then had a bus driver record the number of passengers that boarded the bus throughout the hour. The correlation coefficient (r) was calculated to be -0.88. Use this value to determine the percentage of the variation in the number of passengers that cannot be explained by the outside temperature. Round your answer to the nearest whole number percentage.