1. At your summer job with a research company, you must get a random sample of people from
your town to answer a question about spending habits. Which of the following methods is most
likely to be random?
You survey customers at the local shopping mall.
You survey people chosen randomly from the local phonebook.*
You survey several of your friends.
You survey customers at a popular restaurant.
2. Which survey question is unbiased?
“Do you think we should allow them to cut down the trees and pave over the grass for the new
playground?”
“Which do you prefer with a meal—water, or a syrupy sweet soft drink?”
“Should there be a school dress code?”*
“Do you prefer bringing a healthy lunch to school or eating cafeteria food?”
3. A fish and game warden captures and tags 66 deer in a local forest. A month later he captures 100 deer and finds that 17 of them are tagged. Estimate the actual number of deer in the forest.
149 *
1,022
578
389
4. Lucy wants to find out the number of frogs in a pond near her house. She catches 54 of them, puts a leg band on each frog, and puts them back in the pond. The next week, she catches 70 frogs. Of those 70 frogs, 13 have a leg band. Based on this information, what is a reasonable estimate of the number of frogs in the pond?
208
632
291
111
5. In a sample of 50 museum visitors one afternoon, 22 were female and 28 were male. If there were 800 museum visitors that afternoon, estimate the number of visitors who were female.
220
352*
448
700
6. A manufacturer samples 100 wires for quality testing. Four of the wires are found to be
defective. If 750 wires are produced in one hour, how many should the manufacturer expect to
be defective?
30 *
60
75
96
I don't really know how to solve 3 and 4. Thank you for your help.
So, in summary:
1) b
2) c
3) d
4) c
5) b
6) a
:)
1. b. would have been correct 10 or more years ago. However, since so many people do not have land lines, they are not in the phone book. You wouldn't get many young people (under 60) in your survey. All of your choices are wrong.
2. c -- correct
3. a - no
0.17x = 66
x = ?
4. Do it the same way I showed you for 3.
5. b -- correct
6. a -- correct
3. D
4. C
3 can be done a couple of ways.
The percent way is this.
He caught 100 deer and 17 were tagged; that's 17% tagged or 0.17
Then 17% of what number is 66 which is
0.17*number = 66
number = 66/.17 = ?
or you can do it this way.
Take the number caught, 100, and
100 x 66/17 = ?
4 is done the same way
3. D
4. C
Both are right.