Statistics Unit Test: Unit 9 Lesson 11
1. A large company wants to find out what team-building activity its employees prefer. Which of the following samples can give the most valid generalization?
A. All 624 female employees in the company
B. 400 randomly chosen employees from the list of all employees
C. A group with one member from each department
D. All employees who have worked in the company for 5 years or more
2. A hotel maintenance crew wants to estimate how many of the 12,000 lamps in their 30-story hotel need a new light bulb. Which of the following is a random sample of lamps to be inspected?
A. 400 lamps on the first 10 floors
B. all lamps from the rooms with king-sized beds
C. all lamps in booked rooms
D. 100 lamps on each floor chosen randomly
3. A local library manager randomly surveys 80 patrons about the type of book they borrow when they visit the library. The manager finds that 3 patrons borrow novels. If the local library has 345 patrons, approximately how many of them borrow novels when they visit the library? Round your answer to the nearest whole number.
_____ patrons
4. Frequency: 8, 3, 6, 6, 3, 1, 5, 2,2
Miles: 10-15, 16-20, 21-25, 26-30, 31-35, 36-40, 46-50, 51-55, 56-60, 61-65
The histogram represents a survey that was conducted about how far a sample of adults drive to work per week. What is the total number of adults surveyed?
_____
5. Frequency: 8, 10, 4, 2
Number of pets: 1, 2, 3, 4
A math class created a histogram to track how many pets each student has. What percentage of the class had two or more pets?
____
6. Stem | Leaf
7 | 0
8 |
9 |
10 | 1, 1, 5, 7, 8
11 | 9
12 | 1, 1, 2, 2, 4, 5
In this stem-and-leaf plot an accurate representation of a data set? Type 1 for yes and 2 for no.
____
7. _____________
0 | 5,8
1 | 2, 5, 8
2 | 0, 2, 5, 5
3 | 0, 0, 0, 5
4 | 0, 0, 5
5 | 0, 0, 5, 5
6 | 0, 5, 5
7 | 5, 5
Key: 1|2
Means 12 minutes
The stem-and-leaf plot shows cooking time for various recipes. Which time is the Mode?
___min
8. What rang of typing speeds would appear in the number line of a line plot that displays the following data: 42, 38, 43, 45, 39, 40, 41, 43?
A. 35 to 45 words per minute
B. 37 to 43 words per minute
C. 35 to 43 words per minute
D. 37 to 45 words per minute
9. Which line plot has a median value of 4?
A.
B.
C.
D.
1. B. 400 randomly chosen employees from the list of all employees
2. D. 100 lamps on each floor chosen randomly
3. 42 patrons
4. Total number of adults surveyed: 34
5. Percentage of the class that had two or more pets: 60%
6. 1 (Yes)
7. Mode: 12 minutes
8. C. 35 to 43 words per minute
9. B.
How many baseball players hit more than 19 homeruns?
A. 13
B. 7
C. 8
D. 6