Chapter 7 Sampling and Sampling Distributions
Solutions: 15. a. x = xi / n = $45,500 = $4,550 10 9, 068, 620 = $1003.80 10 1
18. a. b. c. d.
E ( x ) = = 200
x = / n = 50 / 100 = 5
Normal with E ( x ) = 200 and x = 5 It shows the probability distribution
Chapter 6 Continuous Probability Distributions
Solutions: 5. 1. a. f (x) 3 2 1 x .50 b. 1.0 1.5 2.0
b. c. d.
P(x < 15) = .10(5) = .50 P(12 x 18) = .10(6) = .60 E ( x) = 10 + 20 = 15 2 (20 10) 2 = 8.33 12
e. a.
Var( x) =
Length of Interval = 310.6 - 284.7
Chapter 5 Discrete Probability Distributions
Solutions: 1. a. Head, Head (H,H) Head, Tail (H,T) Tail, Head (T,H) Tail, Tail (T,T) x = number of heads on two coin tosses Outcome (H,H) (H,T) (T,H) (T,T) d. 6. a. b. c. d. Values of x 2 1 1 0
b. c. d.
Probabi
Chapter 4 Introduction to Probability
Solutions: 4. a. 1st Toss 2nd Toss 3rd Toss H H T H T (H,H,T) (H,H,H)
7. 11. a.
Introduction to Probability No. Requirement (4.4) is not satisfied; the probabilities do not sum to 1. P(E1) + P(E2) + P(E3) + P(E4) = .1
Descriptive Statistics: Tabular and Graphical Methods
Solutions: 2. a. b. c/d. Class A B C D Total 4. a. b. Show CSI ER Friends Raymond Total: Frequency 18 11 15 6 50 Percent Frequency 36% 22% 30% 12% 100 Qualitative. Frequency .22(200) = 44 .18(200) = 36
Chapter 1 Data and Statistics
Solutions: 5. a. 5 b. c. d. Price, CD capacity, and the number of tape decks are quantitative. Sound quality and FM tuning sensitivity and selectivity are qualitative. Average CD capacity = 30/10 = 3. 7 (100) = 70% 10 4 (100)