12of20

State whether the variable is discrete or continuous. The speed of a car on a Phoenix freeway during rush hour traffic

discrete continuous

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13of20

Decide whether the experiment is a binomial experiment. Testing a pain reliever using 840 people to determine if it is effective. The random variable represents the number of people who find the pain reliever to be effective.

binomial experiment not a binomial experiment

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14of20

Decide whether the experiment is a binomial experiment. You observe the gender of the next 300 babies born at a local hospital. The random variable represents the number of girls.

not a binomial experiment binomial experiment

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15of20

If the probability of x successes in n trials is less than ___% the event can be considered unusual.

10 1 4 5

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16of20

A test consists of 10 true or false questions. To pass the test a student must answer at least eight questions correctly. If the student guesses on each question, what is the probability that the student will pass the test?

0.20 0.055 0.08 0.8

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17of20

Find the standard deviation of the binomial distribution for which n = 60 and p = .2.

3.1 .30 9.6 12

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18of20

Which response best summarizes the law of large numbers?

It states the probability of matching the true mean of a distribution. As trials increase, the difference between the theoretical probability of an event and the relative frequency approaches zero. The relative frequency of an event never exactly matches the theoretical value. As trials increase, the difference between the theoretical probability of an event and the relative frequency approaches infinity.

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19of20

Remember that random variables can be either discrete or continuous. Which of the following are continuous random variables? (select all that apply)

The distance a person has walked in a day How many glasses of water a person consumes in a day The number of steps a person has walked in a day The time it takes someone to tie their shoes

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20of20

Which of the following is not a condition of the binomial distribution?

only 2 possible outcomes have a constant probability of success Must have at least 3 trials trials must be independent