February 17th, 2016
2.) a. Negative
b.This positive association can be accounted for the fact that the owners have higher
income. Since they have higher incomes they can afford cars that are more fuel
BioStats 148 HW #1
January 31st, 2016
3.) The parents who refused to allow their children to participate in the experiment were
not correct in thinking that their child would have a higher risk of polio. This is
February 7th, 2015
5.) 80mm is unusually low.
115mm is average.
120mm is average.
210 is unusually high.
6.) a. 40- iii
b. median is less than average- iii
median is about equal to the ave
March 6th, 2016
1. a. P(both show 3)= () x ()= 1/36,
b. P(same number)= (1/36) x (1/36) x (1/36) x (1/36) x (1/36) x (1/36)= 6/36
4. Option one is better because by having the chance of having at leas
February 24th, 2016
1.) (i)- A
(iv)- Not given.
2.) a.) The estimated average score at age 35 for all the individuals who scored 115 at age 18 is
b.) The predicted score is 112 a
April 21st, 2016
1.) The expected value for the draws will be 100. The SD is 20. The SE for the sum of draws will
be x 20= 400. The SE for the average is 400/400=1. You need to then co
April 13th, 2016
4.) There is a 69% chance that the sum of the gross income is over $33,000,000.
7.) A. True
11 or 12
37 or 38
2.) a. Fract
February 28th, 2016
4.) a. 1
b. The line is not the regression line because based on the data the regression line would
slope downwards. This line could probably be the average value of the Y variable