An event is considered unusual if the probability of observing the event is
A) less than 0.025 B) less than 0.10 C) greater than 0.95 D) less than 0.05
Q. 2Decide whether the experiment is a binomial experiment. If it is not, explain why. Each week, a man attends a club meeting in which he has a 10 chance of meeting a new member.
The random variable is the number of times he meets a new member in 82 weeks.
Q. 3In a/an _________, the researcher observes the experimental units in their natural setting and records the variable(s) of interest.
A) published source B) observational study
C) designed experiment D) survey
Q. 4Which of the following is not a characteristic of Students' t-distribution?
A) depends on degrees of freedom.
B) symmetric distribution
C) For large samples, the t and z distributions are nearly equivalent.
D) mean of 1
Q. 5Video games A headline in a local newspaper announced Video game playing can lead to better spatial reasoning abilities.
The article reported that a study found statistically significant differences between teens who play video games and teens who do not, with teens who play video games testing better in spatial reasoning. Do you think the headline was appropriate? Explain.
Q. 6Decide whether the experiment is a binomial experiment. If it is not, explain why. Survey 500 college students see whether they are enrolled as a new student. The random variable represents the number of students enrolled as new students.
What will be an ideal response?
Q. 7Determine whether or not the following events are mutually exclusive. Four coins are tossed: one tail is observed, at least one tail is observed.
A) cannot be determined B) not mutually exclusive C) mutually exclusive
Q. 8The business college computing center wants to determine the proportion of business students who have personal computers (PC's) at home. If the proportion exceeds 30, then the lab will scale back a proposed enlargement of its facilities.
Suppose 200 business students were randomly sampled and 75 have PC's at home. What assumptions are necessary for this test to be satisfied?
A) The sample variance equals the population variance.
B) The sample mean equals the population mean.
C) The population has an approximately normal distribution.
D) No assumptions are necessary.
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