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1. According to a national CNN/USA/Gallup survey of 1,025 adults, conducted March 14-16, 2008, 63% say they have experienced a hardship because of rising gasoline prices. How do you believe the survey was conducted and what types of bias could occur in the data collection process?
2. Indicate which sampling method would most likely be used in each of the following situations:
a. an interview conducted with mayors of a sample of cities in Florida
b. a poll of voters regarding a referendum calling for a national value-added tax
c. a survey of customers entering a shopping mall in Minneapolis
If you were using the relative frequency of an event to estimate the probablility of the event, would it be better to use 100 trials or 400 trials according to the law of large numbers?
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two fair dice are rolled. lets define the following eventsa the english words for the numbers rolled start with the
A simple random sample of 400 trees is selected, and the sample mean age of these trees is computed. We know the random variable has an approximately normal distribution because of?
small business owners often look to payroll service companies to handle their employee payroll. reasons are that small
let x and y be two independent random variables where x has a bernoulli distribution with probability of success p 12
a normally distributed quality characteristic is monitored throughuse of an x bar and r chart. these charts have the
Angela works as a quality supervisor. She has uncovered a quality issue with safety brackets on baby swings. Angela determines that 21% of the safety brackets are out of spec.
If IQ scores on a Stanford-Binet Test are basically distributed with the mean of 100 and a standard deviation of 15, then about how many people in a randomly chosen million would be expected to score at 160 or above?
1. what is the purpose of conducting an experiment? how does an experimental design accomplish its purpose?2. what are
suppose referendum to increase funding for education is on the ballot in a large town population over 100000. an exit
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