Which of the following statements correctly describes the relationship between a

Question

Which of the following statements correctly describes the relationship between a sample and a population? a) A sample is a group of populations that are subject to observation. b) A population is a group of samples that may or may not be included in a study. c) A sample is a group of subjects selected from a population to be studied. d) A population and a sample are not related. The amount of time needed to run the Boston marathon is an example of which type of variable? a) discrete b) categorical c) continuous d) none of the above Find the median for the following data: 6, 7, 4, 3, 5, 7, 4 a) 3 b) 4 c) 5 d) 7 A gum ball machine contains 300 grape-flavored balls, 400 cherry flavored balls and 500 lemon flavored balls. What is the probability of getting 1 grape ball, 1 cherry ball, and 1 lemon ball if only three balls are removed from the machine? a) 0.0264 b) 0.0531 c) 0.0348 d) 0.0482 A recent poll by the American Automobile Club found that 30% of those surveyed are worried about aggressive drivers on the road. If 3 people are selected at random what is the probability that all 3 will be worried about aggressive drivers on the road? a) 0.900 b) 0.027 c) 0.081 d) 0.300 If one card is drawn from an ordinary deck of cards, what is the probability that the card will be an ace, a king of hearts or a spade? a) 19/52 b) 9/26 d) 11/26

Explanation / Answer

2. c

sample is taken from population

4. c

time is continuous variable such as 1.2 hr, 1.23 hr etc

9. c

median is 5 since it's mid of 3 4 4 5 6 7 7

15. b

=0.3^3=.027

16. b

=4/52+1/52+13/52

12. a

distribution is symmetric

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