A market researcher randomly selects 100 homeowners under 60 years of age and 200 homeowners over 60 ...

A market researcher randomly selects 100 homeowners under 60 years of age and 200 homeowners over 60 years of age. What sampling technique was used?
 
  A) stratified
  B) simple random
  C) cluster
  D) convenience
  E) systematic

Q. 2

A customer service firm receives an average of three calls per hour on its toll-free number. For any given hour, find the probability that it will receive at least three calls. Use the Poisson distribution.
 
  A) 0.5768 B) 0.1891 C) 0.4232 D) 0.6138

Q. 3

A dictionary contains 500 pages. If there are 200 typing errors randomly distributed throughout the book, use the Poisson distribution to determine the probability that a page contains exactly three errors.
 
  A) 0.0072 B) 0.0005 C) 0.1734 D) 0.0129

Q. 4

A city council randomly selects 1000 married couples from a certain city and records the number of women who are in favor of a new football stadium and the number of men who are in favor.
 
  A) qualitative, dependent B) quantitative, dependent
  C) qualitative, independent D) quantitative, independent

Q. 5

True or False? When choosing the sample size for estimating a population proportion p to within E units with confidence (1 - )100,
 
  if you take p  0.5 as the approximation to p, you will always obtain a sample size that
  is at least as large as required.
  A) True B) False

Q. 6

In a college student poll, it is of interest to estimate the proportion p of students in favor of changing from a quarter-system to a semester-system.
 
  How many students should be polled so that we can estimate p to
  within 0.09 using a 99 confidence interval?
  A) 205 B) 182 C) 261 D) 114

Q. 7

A human gene carries a certain disease from the mother to the child with a probability rate of 51. That is, there is a 51 chance that the child becomes infected with the disease. Suppose a female carrier of the gene has five children.
 
  Assume that the infections of the five children are independent of one another. Find the probability that at least one of the children get the disease from their mother. Round to the nearest thousandth. A) 0.972 B) 0.029 C) 0.147 D) 0.028

Q. 8

In a recent online survey, participants were asked to answer yes or no to the question Are you in favor of stricter gun control? 6571 responded yes while 4137 responded no. There was a fifty-cent charge for the call.
 
  What sampling technique was used? A) convenience
  B) simple random
  C) cluster
  D) stratified
  E) systematic