In a survey conducted in the town of Atherton, 28 of adult respondents reported that they had been involved in at least one car accident in the past ten years.
A) parameter B) statistic
Q. 2You wish to estimate the proportion of shoppers that use credit cards. Obtain a sample size that will ensure a margin of error of at most 0.03 for a 95 confidence interval.
It is deemed reasonable to presume that of those sampled, the percentage using credit cards will be at least 61.
A) 1016 B) 914 C) 2604 D) 1754
Q. 3True or False: Observational studies are not as useful as experiments to learn about the characteristics of a population.
A) True B) False
Q. 4Suppose that two balanced dice are rolled. Let Y denote the sum of the two numbers. Use notation to represent the event that the sum of the two numbers is at least 11.
A) (5, 6 ), (6, 5 ), (6,6 ) B) Y > 11
C) X+Y 11 D) Y 11
Q. 5Describe a double-blind experiment and explain why blinding is used. Define the term placebo effect as part of the answer.
What will be an ideal response?
Q. 6x = 33, n = 35
A) Appropriate B) Not appropriate
Q. 7According to the Federal Communications Commission, 70 of all U.S. households have vcrs. In a random sample of 15 households, what is the probability that exactly 10 have vcrs?
A) 0.7939 B) 0.5 C) 0.7 D) 0.2061
Q. 8You wish to estimate the proportion of all voters in California who plan to vote in favor of a certain ballot measure. Obtain a sample size that will ensure a margin of error of at most 0.015 for a 95 confidence interval.
Assume that it is reasonable to presume that of the voters sampled, the proportion in favor of the measure will be between 0.72 and 0.89.
A) 2425 B) 4269 C) 3443 D) 1672
Q. 9x = 3, n = 40
A) Not appropriate B) Appropriate
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