Name:_________________________________Date:________________________Pd:________
Unit 5 - Review
1. A polling company wants to know which airline is rated highest by air travelers. Which sample is
more likely to be random? Explain.
a. The company surveys 50 randomly selected people on a flight from New York to Los
Angeles
b. The company surveys every 20th person entering 5 different US airports on one day.
2. Is each question biased or fair? Explain.
a. Do you like warm fun summer or cold dreary winter?
b. What is your favorite season?
Use a proportion to estimate each animal population.
3. Total deer counted: 58
Marked deer counted: 7
Total marked deer: 52
4. Total snow geese counted: 378
Marked snow geese counted: 68
Total marked snow geese: 204
5. Suppose 25 penguins were marked in a nesting area. Later, 500 penguins were counted, 19 of
which were marked. Estimate the population.
The table shows the heights of a random sample of 7-year olds at a school. Use the sample to
make an inference about each measure.
6. The mean height of 7 year olds at the school.
7. The median height of 7 year olds at the school.
8. The percent of 7 year olds who are under 47 in tall.
9. The percent of 7 year olds who are at least 50 in tall.
Compare each pair of measures for the data sets in the box and whisker plot and use the
comparison to make an inference.
10. The medians of the data sets.
11. The IQRs of the data set
12. What does the IQR tell you about the data sets?
A company who conducts surveys completes 3 separate surveys of 15 teenagers each asking the
number of times they check a social networking site each week. The company records the data.
The list below shows the results:
Sample 1: 96, 96, 116, 46, 46, 73, 114, 101,137, 136, 66, 95, 148, 82, 112
Sample 2: 119, 120, 121, 77, 94, 77, 106, 85, 71, 97, 106, 81, 111, 106, 105
Sample 3: 111, 93, 78, 41, 85, 131, 113, 102, 92, 114, 137, 76, 115, 126, 108
13. For each sample, determine the mean number of times a person checks the social networking site.
14. Describe the variation in the samples.
15. Make an inference about the mean number of times a person checks the website each week.
16. The data below shows the prices of MP3 players at two different stores.
Store A
Store B
$130
$80
$80
$99
$169
$69
$199
$189
$80
$142
$249
$229
$179
$90
$95
$100
$110
$72
$179
$180
$80
$169
$199
$80
$249
$179
$95
$110
$179
$99
$69
$189
$142
$229
$90
$100
$72
$180
Mean for Store A:
Costs:
Mean
Distance:
$130
Store A MAD:
Mean for Store B:
Costs:
Mean:
Distance:
$80
Store B MAD:
17. What number n multiplied by the MAD equals the difference between the means?
18. What does this number tell you about the overlap in the data sets?
You roll a number cube. Find the Probability.
19. P(2)
20. P(3 or 5)
21. P(not a prime number)
22. A quality control engineer at a factory inspected 300 gel pens for quality. The engineer found 15
defective pens. What is the experimental probability that a gel pen is defective?
23. The basketball team won 37 games and lost 4. What is the Probability that they will win a game?
24. The football team wins 25 games and lost 3. What is the probability they will lose a game?
25. Make a table or tree diagram to show the sample space for tossing a coin 3 times.
26. Using your tree diagram find each probability:
a.) P(Head 3 times)
b.) P(of at least 2 tails)
A bag contains 6 green marbles, 8 blue marbles, and 3 red marbles. Find the probability of each
if the first marble drawn is replaced.
27. P( green then red)
28. P( red then red)
A bag contains 6 green marbles, 8 blue marbles, and 3 red marbles. Find the probability of each
if the first marble drawn is not replaced.
29. P( red three times in a row)
30. P(green then blue)
Using the Counting Principle find the total number of outcomes each.
31. How many combinations can be made from 3 types of sandwiches, 4 types of salads, and 5 types of
chips?
32. How many types of sundaes can be made from 3 different sizes, 6 different flavors and 4 toppings?