# Doing basic statistics for test

**Question description**

1. When rolling a die, the probability of getting a 4 is ____. (Points : 2)

.25

1.67

.167

none of the above

Question 2.2. The formula for the probability that two events can occur at the same time is ____. (Points : 2)

P(AB)

P(A+B)

P(A) + P(B)

this can never happen because two events are always mutually exclusive

Question 3.3. A jar contains 10 red marbles and 20 blue marbles. What is the probability of randomly selecting a red marble? (Points : 2)

0.5

0.33

0.10

0.033

Question 4.4. A random sample requires that (Points : 2)

every individual has a chance of being selected

the probabilities cannot change during a series of selections

there must be sampling with replacement

all of the above

Question 5.5. A random sample requires that (Points : 2)

every individual has an equal chance of being selected

individuals are selected from a convenience group

no one knows how many people are in the population

both a and b are correct

Question 6.6. A standard normal distribution is ____. (Points : 2)

the standard by which all other distributions are compared

a normal distribution with a mean of zero and the standard deviation of one

a hypothetical distribution that does not really exist

much larger than a regular normal distribution

Question 7.7. Sampling error occurs when ____. (Points : 2)

samples are not identical to the population from which they came

the researcher uses too large of a group

the population is too large

none of the above are correct

Question 8.8. For the past 20 years, the high temperature on April 15 has averaged 62° with a standard deviation of 12. Last year the high temperature was 68°. Based on this information, which of the following best describes last year's temperature on April 15? (Points : 2)

a little above average

far above average

above average, but it is impossible to describe how much above average

there is not enough information to compare last year with the average

Question 9.9. A Type I Error is ____. (Points : 2)

often the correct decision

made when two people interpret the same data

when a true null hypothesis is rejected

an indication that a calculation error was made

Question 10.10. The shape of the normal distribution ____. (Points : 2)

depends on the size of the distribution

is "bell shaped”

is always higher on the right side than the left

is asymmetrical

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