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STATS Test 2
| Question | Answer |
|---|---|
| Discuss the range of possible values for probabilities. Give examples to support each. | 0-1; range of probabilities is 0, 1, or a value between 0 and 1. 0 is not possible and 1 is going to happen. |
| A class consists of 46 women and 81 men. If a student is randomly selected, what is the probability that the student is a woman? | 46/127. |
| Is it "unusual" to get a 12 when a pair of dice is rolled? | yes. |
| Is it "unusual" to get 9 when a pair of dice is rolled? | no 2/21= .095 |
| A multiple choice question has 16 possible answers, only one of which is correct. Is it "unusual" to answer a question correctly if a random guess is made? | no 1/16= .063 |
| A spinner has equal regions numbered 1 through 15. What is the probability that the spinner will stop on an even number or a multiple of 3? | 2/3 |
| The probability that an event will occur is 0.2. What is the probability that the event will not occur? | 0.8 |
| A bin contains 71 light bulbs of which 9 are defective. If 6 light bulbs are randomly selected from the bin with replacement, find the probability that all the bulbs selected are good ones. | 0.443 |
| You are dealt two cards successively (without replacement) from a shuffled deck of 52 playing cards. Find the probability that the first card is a queen. | 4/663. (4/52 x 4/51) |
| A study conducted at a certain college shows that 53% of the school's graduates find a job in their chosen field within a year after graduation. Find the probability that among 7 randomly selected graduates, at least one finds a job in his or her chosen f | 0.995 |
| If one of the 255 subjects is randomly selected, find the probability that the person is over 40 years of age. | 1/3 (85/255) |
| Relative frequency= | number of times event A occurs/ number of time the procedure is repeated |
| Classical= | number of different way event A can occur/ number of different simple events possible (sample space) |
| What is mutually exclusive? | events cannot happen at the same time ex. being catholic and jewish. |
| What is independent? | the probability of one even does not affect another's probability ex. being a female and playing soccer. |
| What is P(BIA)? | probability that event B occurs given event A has already occurred. |
| What do we know if P(BIA) is not the same as P(B)? | if P(BIA) does not equal P(B) then the events are dependent. |
Created by:
danreid