1 A basic method of collecting data for statistical analysis

1 A basic method of collecting data for statistical analysis is: A A designed experiment B An observational study C A retrospective study D All of these 2 What kind of random variable is the Yes/No response to the survey question: \"Do you own a gun\"? A Qual - Nominal B Qual - Ordinal C Quant Continuous D Quant Discrete 3 If P(A)-0.3, p(B) = 0.2 and P(A B)-0.1, then P(A U B) is: A B 0.6 0.8 C 0.2 D 0.4 Suppose that P (A 1 B) # 0.2, p (A | B·)-0.3 and p (B )-0.8. Therefore, p (A ) is: A. 0.22 B. 0.16 C. 0.78 D. 0.64 5 A system is composed of two independent components as shown. The probability that Component 1 and 2 will fail in the next week is 0.15 and 0.19 respectively. The probability that the system will not fail in the next week is: 2 A 0.839 B 0.879 C 0.689 D 0.972 A system is composed of two independent components as shown to the right. The probability that Component 3 and 4 will survive in the next week is 69 and 0.57 respectively. The probability that the system will fail in the next week is: 6 A 0.607 B 0.867 C0.133 D 0.393

Solution

1)

2)

3)0.4

4)0.64

5) 1-0.15(0.19) = 0.9715

6) 1-0.31(0.43) = 0.8667

7)23/55=0.418

10) Yes

11) Binomial

12)