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You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 99% confidence level and state that the estimated proportion must be within 2% of the population proportion. A pilot survey reveals that 7 of the 49 sampled hold two or more jobs.
How many in the workforce should be interviewed to meet your requirements?
Suppose that by the end of 2009, that percentage was 85%. If a sample of 10 U.S. adults is selected, what is the probability that:
What method is best suited for such a survey? Draw the sample using the random number table and bring out the rationale of the procedure.
145 out of 165 people who lost luggage on that airline were reunited with the missing items by the next day. Does this cast doubt on the airlines claim?
Assume the reliability of a product is given by an exponential distribution with a mean of 1 year. How long would it take to achieve a 10% failure rate?
State the null and alternative hypotheses needed to attempt to establish that the advertisement increases the mean attitude score
In a batch of 8,000 clock radios 9% are defective. A sample of 15 clock radios is randomly selected without replacement from the 8,000 and tested.
Industry standards suggest that 10 percent of new vehicles require warranty service within the first year. What is the probability that none of these vehicles requires warranty service?
prices for regular unleaded gasoline can vary widely from day to day and location to location. these data were obtained
in an instant lottery your chances of winning are 0.2. if you play the lottery five times and outcomes are independent
A city official has stated that 20% of the items sold by pawn shops within the city have been stolen. Ralph has just purchased 4 items from one of the city's pawn shops.
Construct a 90 percent confidence interval for the true mean weight. What sample size would be necessary to estimate the true weight with an error of +/-} 0.03 grams with 90 percent confidence?
A firm keeps account for 28 customers. 12 of these are defined as new customers and 14 are locally based. If just 3 new customers live locally, how many established customers do not live locally?
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