Determine whether the statement describes a population or a sample.

1. The annual salaries of all the teachers in a high school

a)Population b) Sample c) Neither

Identify which of these types of sampling is used: random, stratified, systematic, cluster, convenience.

2. A sample consists of every 49th student from a group of 496 students.

a) Stratified b) Convenience c) Random d) Systematic

Determine whether the given value is a statistic or a parameter.

3. A researcher examines the records of all the registered voters in one city and finds that 43% are registered Democrats.

a) Statistic b) Parameter c) Neither

Solve the problem

4. Using the information in the table on home sale prices in the city of Summerhill for the month of June, determine the width of each class.

Class Limits (sale price in thousands) Frequency (No. of homes sold)

80.0 - 110.0 2

111.0 - 141.9 5

142.0 - 172.9 7

173.0 - 203.9 10

204.0 - 234.9 3

235.0 - 265.9 1

a) 30 b) 61 c) 31 d) 28

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate.

5. Salaries of college professors.

a) Ordinal b) Interval c) Nominal d) Ratio

Determine whether the given value is a statistic or a parameter.

6. Based on a sample of 500 patients with high cholesterol, it was found that 67% have heart disease.

a) Parameter b) Statistic c) Neither

Identify the number as either continuous or discrete.

7. The height of a 2-year old maple tree is 28.3 ft.

a) Discrete b) Continuous c) Neither

Find the mean for the given sample data.

8. Frank's furniture employees earned $451.95, $240.03, $203.92, $490.22, and $278.68 last week. Find the mean wage of the employees. Round your answer to the nearest cent.

a) $326.59 b) $391.90 c) $379.90 d) $489.88

Find the median for the given sample data.

9. A new business had the following monthly net gains:

$7637, $1376, $3667, $6949, $6007, $1381, $2968, $8784, $5980, $5439

Find the median net gain

a) $5576.33 b) $5709.50, c) $5018.70 d) $5980.00

Find the variance for the given data. Round your answer to one more decimal place than the original data.

10. 11.7, 15.9, 12.3, 12.1, and 14.2

a) 3.14 b) 2.51 c) 39.66 d) 3.04

Find the standard deviation for the given data. Round your answer to one more decimal place than the original data.

11. 196, 205, 215, 185, 229, 278, 165

a) 36.2 b) 30.2 c) 33.1 d) 12.7

Solve the problem. Round results to the nearest hundredth.

12. The mean of a set data is 121.54 and its standard deviation is 117.87. Find the z score for a value of 412.92.

a) 2.72 b) 2.77 c) 2.22 d) 2.47

Find the percentile for the data point.

13. Data set: 3, 12, 8, 7, 3, 3, 12, 7, 3, 12, 2, 12, 15, 4, 9, 3, 12, 8, 7, 12; data point 6

a) 47 b) 62 c) 30 d) 25

List data using a stem-and-leaf diagram.

14. The following data show the number of laps run by each participant in a marathon.

46, 65, 55, 43, 51, 48, 57, 30, 43, 49, 32, 56

a) 3: 0, 2 b) 3: 0, 2

4: 3, 6, 8, 9 4: 3, 3, 6, 8, 9

4: 1, 3, 5, 6, 7, 5: 1, 5, 6, 7

6: 5 6: 5

Identify the given random variable as being discrete or continuous.

15. The number of phone class between New York and California on Thanksgiving day

a) Continuous b) Discrete

Find the indicated probability.

16. A sample of 100 wood and 100 graphite tennis rackets are taken from the warehouse. If 13 wood and 12 graphite are defective and one is randomly selected from the sample, find the probability that the racket is wood or defective.

a) 0.565 b) 0.125 c) 0.56 d) There is insufficient information.

17. A die with 12 sides is rolled. What is the probability of rolling a number less than 11?

a) 1/12 b) 10 c) 11/12 d) 5/6

18. Two 6-sided dice are rolled. What is the probability that the sum of the two numbers on the dice will be 5?

a) 8/9 b) 5/6 c) 1/9 d) 4

19. A card is drawn from a well-shuffled deck of 52 cards. What is the probability of drawing an ace or a 6?

a) 2/13 b) 13/2 c) 7 d) 7/26

20. A batch consists of 12 defective coils and 88 good ones. Find the probability of getting two good coils when two coils are randomly selected if the first selection is replaced before the second is made.

a) 0.0144 b) 0.7744 c) 0.7733 d) 0.176