Online Survey | Built with Qualtrics Experience Management™

Group Quiz

Please enter one of your Math Camp ID numbers here:

1. A 2014 UNRWA report noted that the relationship between refugee camp overcrowding (x) and the prevalence of scabies (y) can be described by x=0.2y+4. If y=3x-10 describes the relationship between diarrhea incidence (y) and overcrowding (x), how dense are the camps where scabies is more prevalent than diarrhea?

a. When there’s more than 10 families per block
b. When there’s more than 5 families per block
c. When there’s less than 20 families per block
d. When there’s less than 10 families per block
e. Not sure

2. Suppose the relationship between illnesses (y), density of families per block (x), and water availability (z) is y = 1-2x+0.25x²-0.5z. What is the optimal number of families per block to minimize the spread of illnesses?

a. 4 families per block
b. 5 families per block
c. 0.5 families per block
d. 8 families per block
e. Not sure

3. Open school.csv. Draw a scatterplot with test score (testscr) on the y axis and average income (avginc) on the x axis. Does this look like a linear relationship? Why, or why not?

a. It is linear, because the relationship between x and y is constant
b. It is not linear, because the relationship between x and y is constant
c. It is linear, because the relationship between x and y is not constant
d. It is not linear, because the relationship between x and y is not constant
e. Not sure

4. Generate a new variable that is the log of average income and call it logavginc. Regress testscr against logavginc. Which of the equations below describes the relationship between test scores (y) and income (x)?

5. Use no. 4 to answer this question. What is the effect of a $1k income increase on test scores in a district with an average income of 10k? What about a district with an average income of 20k?

a. $1k increase in income will increase test scores by 3.5 points in district with $10k average income and by 1.8 points in districts with $20k average income.
b. $1k increase in income will increase test scores by 87 points in district with $10k average income and by 110 points in districts with $20k average income.
c. $1k increase in income will increase test scores by 0.18 points in district with $10k average income and by 0.09 points in districts with $20k average income.
d. $1k increase in income will increase test scores by 1.9 points in both districts.
e. $1k increase in income will increase test scores by 36.4 points in both districts.
f. Not sure