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Identify and justify which type of sampling (random, stratified, systematic, cluster, convenience) is used in the following examples.
a) A market researcher polls 50 people at a local shopping mall.
b) To avoid working late, a control analyst simply inspects the first 100 items produced in a day.
c) A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.
d) A tax auditor selects every 1000th income tax return that is received.
e) A market researcher selects 500 people from each of 10 cities.
Assume the population is normally distributed, the confidence level is 95%, n = 12, and σ is unknown.
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
In how many different ways can 5 songs be arranged if a particular song must be the first on the EP?
Suppose 31% offer both retirement plans and life insurance as benefits. If a small company is randomly selected, determine the following probabilties:
According to the survey, 37% of the adults are concerned that employers are monitoring phone calls. Use the binomial distribution formula to calculate the probability that:
The estimated salary range is $4,500, the margin of error should be $100 and the desired level of confidence is 95%.
She figures that each box costs $ 2.59 plus $ 0.21 shipping and handling, which totals $ 2.80, then she adds $ 0.70 profit to each box and sells it for $ 3.50. Do you think this is a good pricing strategy? How would it compare to marking up by a p..
What is the sample space for this process and evaluate the variance of the intelligence scores
Ninety of the sample students are in the Business College, 120 are in the Liberal Arts College, and 90 are in the Education College.
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
What is the mean and standard deviation of the number preferring the incumbent and what is the probability that more than 68% will favor the incumbent?
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