Question

Empire Ford wants to estimate the proportion of trucks compared to all vehicles. They take several random samples of size 100 from the reserved parking lot (where there are numbered, pre-assigned parking spaces) at the Avista baseball stadium. Which of the following is NOT a correct statement?

A. Due to sampling variability, each sample could produce a different proportion.
B.If a particular numbered stall does not contain a truck, it is acceptable to continue examining stalls until one with a truck is found.
C.The sample may be biased since baseball fans may not have the same preferences in vehicles as the general population.
D. Random samples of size 100 are adequate for this study.
E. It is improper to select from only the numbered, reserved stalls, since those owners with their own parking stalls may be correlated with income level.
Please explain, i think the answer is B but I'm not sure

Answer 1

@jim_thompson5910

Answer 2

@iambatman @satellite73

Answer 3

@dan815

Answer 4

which ones have you been able to eliminate so far?

Answer 5

C and D

Answer 6

E

Answer 7

I agree. So that's how far you were able to get? Or were you able to get further?

Answer 8

well i think the answer is B but I'm not sure, can you confirm or counter that?

Answer 9

B.If a particular numbered stall does not contain a truck, it is acceptable to continue examining stalls until one with a truck is found.

Yeah this is a horrible way to do a survey. Basically if someone said that B was a good way to do a survey, then you'd get nothing but trucks even if there were other vehicles out there.

Answer 10

okay great! can you help with another?

Answer 11

sure I can help with one more

Answer 12

Eight people who suffer from sinus infections volunteer to test a new medication that will relieve symptoms. The names of the volunteers are:

1. Amanda
2. Scott
3. Tessa
4. Jon
5. Elizabeth
6. Kevin
7. Robin
8. Mike

Four of the volunteers will receive the new medication while the other four will receive a placebo as part of a double blind experiment. Starting at the left of the list of random numbers below and reading from left to right, assign four people to be given the medication.

20742 05310 65921 01652 75532 95621 12097

The four people assigned are:

A. Scott, Robin, Jon, Scott
B. Scott, Amanda, Elizabeth, Kevin
C. Scott, Robin, Jon, Elizabeth
D. Tessa, Kevin, Jon, Scott
E. Robin, Mike, Amanda, Scott

Answer 13

we have 8 people, which is less than 10

so we have single digit number labels

that means we look through the random number table 1 digit at a time to pick out the people we are going to assign to the "treatment" group. These people get the medication. The rest get the placebo

Answer 14

so its c?

Answer 15

20742 05310 65921 01652 75532 95621 12097

First number: 2
2 is Scott, so Scott is the first one picked

Second number: 0
no one has the number 0, so we move on

Third number: 7
7 is Robin, so she comes after Scott

Fourth number: 4
Jon has label 4, so he comes next

Fifth number: 2
2 is Scott, but we already picked him. Why test him again when one is enough? So we just skip this number or any other 2 we find

Sixth number: 0
no one has the number 0, so we move on

Seventh number: 5
Elizabeth is the last one chosen since we only need 4 people for the treatment group


The four people we chose are...
Scott, Robin, Jon, Elizabeth

Answer 16

yep, choice C Scott, Robin, Jon, Elizabeth

Answer 17

okay thank you!

Answer 18

sorry do you have time for one more or no?

Answer 19

@jim_thompson5910