STAT 101 on to at 6. Which of the (a) Sample mean (b) Sample standard devistio (

Question

STAT 101 on to at 6. Which of the (a) Sample mean (b) Sample standard devistio (e) Sample ein (d) Sample proportion averaged 70, then the male stodents in the clam aveg (a) 85.0 (b) 82.5 (c) 77.5 (d) 75.0 8. A pharmaceutical company interested in mea uring how ofen plyn-mai. certain drug has selected a simple random sample from each of two goeial doctors and osteopathic doctors. What is this type of saanpling called (a) Simple random sampling (b) Cluster sampling (c) Stratified sampling (d) Systematic sampling 9. The number of traffic accidents per day on a certain section of highway is thought to be Poisson distributed with a mean equal 2.19. The standard deviation of mber d accidents is: (a) 2.19 (b) 4.80 (c) 1.48 (d) 3.14 10. If P(A) = 0.30, P(B-040 and P(An B) = 0.20, then P(A 1 B) is (a) 0.12 (b) 0.08 (c) 0.67 (d) 0.50

Explanation / Answer

Question 6

Standard deviation is a measure of spread and rest of the options are measure of central tendency. OPtion B is correct.

Question 7

Average of 10 male students = (25 * 75 - 15 * 70)/10 = 82.5

Question 8

THe given sampling is stratified sampling. Option C is correct.

Question 9

As the distribution is poisson distribution with mean = 2.19 so for poisson distribution,

The standard deviation of number of accidents are = sqrt(2.19) = 1.48

OPtion C is correct.

Question 10

P(A) = 0.30

P(B) = 0.40

P(A B) = 0.20

P(A l B) = P(A B)/ P(B) = 0.20/ 0.40 = 0.5

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