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Telephone marketers and opinion polls use random digit dialing equipment to call residential telephone numbers at random. The polling firm Zogby International reports that just 17% of calls reach a live person. Calls are independent.
A telemarketer places 6 calls. What is the probability (±0.0001) that none of them reaches a person?
Only 6% of calls made to residential numbers in New York City reach a person. What is the probability (±0.0001) that none of 6 calls made to New York City reaches a person?
A sample of 10 urgent and non-urgent patients was conducted to determine average wait time. The hospital wants to be sure that urgent patients do not wait as long as non-urgent patients. The following hypotheses have been formulated.
An electrical firm manufactures electric light bulbs that have a length of life which is normally distributed with mean and standard deviation equal to 500 and 50 hours, respectively.
What is the probability that the sample will have between 50% and 60% of the identifications correct? What is the probability that the sample percentage of correct identifications is greater than 65%?
Pick a random sample of 50 homes from the enclosed 90 cases. Double the asking price and selling price and use this data to develop three predictive models:
a coin is tossed 4 times. let a be the event that the first toss is heads. let b be the event that the third toss is
To market a new white wine, a winemaker decides to use two different advertising agencies one operating in the East and one in the West. After the white wine has been on the market for 8 months, independent random samples of wine drinkers are take..
Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7 grams of fat per pound.
jane and janet are both taking math 301. they are good students and work independently. jane has a 45 chance of earing
how can you do a regression analysis on excel to predict your sales for the next 5
Jolly Blue Giant Health Insurance is concerned about rising lab test costs and would like to know. Determine the essential sample size?
information about a regression analysis includes an intercept of 5.99 and a slope of 0. make a prediction of y based on
What value is business research and hypothesis testing to a company? What is the "perfect" standard normal distribution? Explain your answer.
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