A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporter's data is valid or not?
A. The data is valid for the entire city because the bird refuge is located in the city.<----------
B. The data is not valid for the entire city because people can have more than one hobby.
C. The data is not valid for the entire city because bird watchers are more likely to visit a bird refuge.
D. The data is valid for the entire city because a bird refuge is a good place to find people who like to watch birds.
Okay well I just got my test answers. I completely BOMED that test. I got all of the essay questions wrong. Here are the real answers:
19.
A. The graph could be misleading because the vertical scale uses very small intervals and starts at 3.8, which makes the changes seem greater than they really are.
B. The graph could be redrawn with its vertical scale starting at zero and with larger intervals.
20.
A. Mean: 78, Median: 80.5, Mode: 58. (My teacher did not reply on B so i'm guessing its right.)
21. A. 125 turtles. B. 150 turtles.
22.
A. All but the lowest value for Soil B and the highest value for Soil B fall within the same range.
B. Soil A: 71.8. Soil B: 75.
C. Soil A: 8.16, Soil B: 5.4.
D: The heights of the sunflowers planted in Soil A are more variable because the means of the heights in each group are about the same, but the mean absolute deviation for Soil A is greater.