# A random selection of registered voters within the state of California guarantees that: a. at least some registered voters will be selected from each county

A random selection of registered voters within the state of California guarantees that: a. at least some registered voters will be selected from each county b. at least some registered voters will be selected from San Diego c. all registered voters have an equal chance of being selected d. all registered voters will be adequately represented Assume that in a statistics class, the probability of receiving a grade of A equals .3 and the probability of receiving a grade of B equals .3. the probability that a randomly selected student from this class will receive either an A or a B equals: a. .09 b. .6 c. .3 d. .9 If the probability that any offspring of alcoholic parents will be alcoholic equals .2, what’s the probability that two children of alcoholic parents will both be alcoholic (assuming these are independent outcomes)? a. .04 b. .1 c. .2 d. .4 Since the probability that a new marriage will end in divorce varies based on whether either of the newly-weds has been divorced before, these two outcomes (the fate of the new marriage and the previous divorce record of the newly-weds) are: a. dependent b. independent c. mutually exclusive d. none of the above If the probability equals .01 that any randomly selected person from the general population has an IQ of 145 or above, what is the probability that three randomly selected people all will have IQs of 145 or above? a. (.01)(3) b. .01 + .01 + .01 c. (.01)(.01)(.01) d. .01 + .01 Increasing the sample size: a. guarantees that the sample will be representative of the population b. reduces the variability of the sampling distribution c. increases the variability of the sampling distribution d. changes the variability of the population e. none of the above A random sample of 100 college students is taken from the student body of a large university. Assume that the standard deviation of number hours spent studying per week for the entire student body is 15. What is the standard error of the mean? a. .15 hours b. 1.5 hours c. 15 hours d. 150 hours the shape of the sampling distribution is approximately normal if: a. the shape of the population distribution is normal b. the sample size is greater than 25 c. the sample size is less than 25 d. either A or B e. none of the above You roll a pair of six-sided dice (each can be a 1,2,3,4,5, or 6). What is the probability that the sum of your dice is greater than 10? Express as a decimal, rounded to two decimal places (e.g.: .25) In a game of rock-paper-scissors, you have a 1/3 chance of winning, a 1/3 chance of losing, and a 1/3 chance of tying in any given round. What is the probability that you will win at least twice in 3 rounds, given that there aren’t any tied rounds in this particular match? Give the answer in decimal form, to two decimal places (e.g.: .20)

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