Problem 30

  1. average MPG for the last six fill ups

  2. Mean MPG of your car

  3. you only calculated the milegae for the last 6 times, meaning the data might not by typical or representative.

  4. Mean MPG for all cars similar to mine (make, model, etc)

Problem 32

  1. If managment interveiws only people from a certain position, such as project managers, they will get an unrepresentatvie result of the whole workforce that inclues foremen and laborers.

  2. use an SRS with each laboroed assigned a number, 1-439, and sample. Interview those selected.

  3. and SRS might not be as effective becuase it does not represent each group. To fix this the company could stratify.

  4. The company could stratify to get results from each group

sample(0:14,2)
## [1]  1 11

These two will be interviewed

Problem 33

sample(61:80,3)
## [1] 69 61 76

These cases will each provide 1 sample jar within them to test the salsa. to determine which jar in each random case to use, assign the jars numbers 1-12, then use the numbers correlated here for each case

sample(1:12,3)
## [1] 10  2  1

The stregy is stratified to ensure the best possible assurance that the quality of salso is representative.

Probelem 34

Maybe. If the color of the fish somehow reltes to how often that fish is caught, then these results might not be representative. But if they are, then this could be a fairly reasonable approximation for the percent of fish discolored.

Problem 35

  1. If the Yellow pages are regular and all doctors are on it, then this might be apprioate. if it’s solely ads or doesnt have all the doctros then it is not.

  2. This is not a good samplin method, as it will most liekly only represent 2 groups.