1. Use the following sample data to find the mean, X-Bar: -1, 0, 2, 3, 7, 7, 10

(Round answer to one decimal position.) (Points : 10)

 

 

Question 2. 2. Use the following sample data to find the median: -1, 0, 2, 3, 7, 7, 10

(Round answer to one decimal position.) (Points : 10)

 

 

 

Question 3. 3. Use the following sample data to find the mode: -1, 0, 2, 3, 7, 7, 10

(Round answer to one decimal position.) (Points : 10)

 

 

Question 4. 4. Use the following sample data to find the standard deviation: -1, 0, 2, 3, 7, 7, 10

(Round answer to one decimal position.) (Points : 10)

 

 

Question 5. 5. Use the frequency distribution table below showing a sample data set for 10 students on a test with a maximum score of 20 to find the mean score, X-Bar. (Round answer to one decimal position.)

 

Score	Frequency	Midpoint	Midpoint x Frequency	Midpoint squared x Frequency
1-5	4	3	12	36
6-10	3	8	24	192
11-15	2	13	26	338
16-20	1	18	18	324
Total	10		80	890

 

 

Question 6. 6. Use the frequency distribution table below showing a sample data set for 10 students on a test with a maximum score of 20 to find the standard deviation of the scores. (Round answer to one decimal position.)

 

Score	Frequency	Midpoint	Midpoint x Frequency	Midpoint squared x Frequency
1-5	4	3	12	36
6-10	3	8	24	192
11-15	2	13	26	338
16-20	1	18	18	324
Total	10		80	890

 

 

Question 7. 7. A delivery truck must make stops in eight different cities, designated by the first letter in the name of the city: A, B, C, D, E, F, G, and H. If the order in which the truck visits the eight locations is chosen randomly, what is the probability that it will visit them in alphabetical order? (Write a, b, or c as your answer.) (Points : 10)

 

Question 8. 8. Suppose P(AB) = P(A), P(A and B) = .42, and P(A) =0.6. What is P(B)? (Points : 10)

0.07

0.007

 

Question 9. 9. Using the table below showing the number of students who are taking a statistics course in the traditional face-to-face mode versus online by gender. Assume one person is chosen at random from the 165. What is the probability that person is an online student who is also male? Enter your answer as a fraction (a/b).

 

	Online	Traditional	Totals
Male	25	30	55
Female	50	60	110
Totals	75	90	165

 

 

 

 

Question 10. 10. Using the table below showing the number of students who are taking a statistics course in the traditional face-to-face mode versus online by gender. Assume one person is chosen at random from the 165. What is the probability that person is a male student taking the course in the traditional mode? Enter your answer as a fraction (a/b).

 

	Online	Traditional	Totals
Male	25	30	55
Female	50	60	110
Totals	75	90	165

 

Question 11. 11. Acme Airlines flies airplanes that seat 12 passengers. From experience, they have learned that, on average, 80% of the passengers holding reservations for a particular flight actually show up for the flight. If they book 13 passengers for a flight, what is the probability that 12 or fewer passengers holding reservations will actually show up for the flight? (Write a, b, or c as your answer.) (Points : 10)

less than 90%

more than 95%

 

Question 12. 12. What is the approximate minimum percentage of data in any frequency distribution that lies within 3 standard deviations of its mean? (Points : 10)

75%

89%

 

 

Question 13. 13. Let X be a normally distributed random variable with No Image = 100 and No Image = 10. Find the probability that X is between 70 and 120. (Round your answer to the nearest whole number percent.) (Points : 10)

 

Question 14. 14. If A and B are independent events which rule do we use? (Points : 10)

P(A or B) = P(A) + P(B)

 

Question 15. 15. If the goal is to make an inference about a population from a sample, and each member of the population has an equally likely chance of being chosen for the sample, we say the sample has been randomlychosen. (Points : 10)

 

 

Question 16. 16. Let a random sample be taken of size n = 36 from a population with a known standard deviation of No Image= 3. Suppose that the mean of the sample is X-Bar= 37. Find the 95% confidence interval for the mean, No Image, of the population from which the sample was drawn. (Round the values to whole numbers for your confidence interval.) (Points : 10)

 

 

Question 17. 17. Name three measures of center.