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What is the probability that a randomly selected group of 50 shoppers will spend a total of more than $5700? The total will be more than $5700 when the sample average exceeds what value?
What is the forecast for the next period using an exponential smoothing technique (alpha = 0.5) if the actual value last period was 170 and the forecast was 180?
the company will replace any printer that fails during the guarantee period. How long should speedy jet printers be guaranteed if the company wishes to replace no more than 15% of the printers?
Are we 95 percent confident that the proporation exceeds .48, the historical proportion of customer delight for Bank of America?
What is the probability of drawing any faulty component if 3 different components are drawn?
Calculate 95 percent and 99 percent confidence intervals for µ. Using the 95 percent confidence interval, can we be 95 percent confident the µ is at least 50 pounds? Explain.
Rob earns $50,000 per year. The mean salary for engineers with less than 5 years experience is $60,000 with a standard deviation of $5000. What is the Z value of Rob? Use Z = [x -population mean]/p
The .05 significance level. Her alternative hypothesis is that the water does not have a pH of 7. For which p-value will she fail to reject the null hypothesis?
If the annual advertising expenditures are known to be normally distributed and the standard deviation of the population (σ) is $750, what would be the 95% confidence interval for the true mea
A company manufactures electric light bulbs that have an average life of 1000 hours and a standard deviation of 50 hours. Find the probability that a bulb selected at random will have a life span o
only 9 of them involved a teenage driver. If the politician is correct, what is the chance that you would observe 9 or fewer accidents involving a teenage driver?
The officers of president,vice president,secretary,and treasurer for an enviromental club will be filled from a pool of 14 candidates. What is the probablity that all of the offices are filled by mem
Describe the sampling distribution for the sample proportion by naming the model and telling its mean And standard deviation. Justify your answer.
If individual luggage weights are independent, normally distributed rv's, what is the probability that total luggage weight is at most 2500 lb?
Find the probability that a sample of 16 tires will have an average tire life of more than 52000 miles, give that the mean tire life is 50000miles and the standard Deviation is 8489.13 .
Testing of a number of switches finds that in 350,000 hours of total test time, 35 failures occur. It is assumed that the Poisson distribution will govern the probabilities of failure.
A survey is conducted at North Central University to measure the effect of the change in environment on international students.
Suppose I fly to New York on airline X and return to Los Angeles on airline Y. Let A = {X losses my baggage} and B ={Y losses my baggage}. If A and B are independent events with P(A) > P(B), P(A&
Decide whether the experiment is a binomial, Poisson, or neither based on the information given. You observe the gender of the next 950 babies born at a local hospital. The random variable represent
What is the probability that , of 20 randomly chosen drivers coming to an intersection under these conditions At most 2 will come to a complete stop?
Assume that federal regulations require that the average smoke stack concentration of a certain industrial pollutant must not exceed 135 ppm. The Environmental Protection Agency suspects that one fa
Identify one example of a chance cause of variation and one example of an assignable cause of variation. Support your position.
If she were to order 80 pounds of pepperoni at a time, what would be the total daily costs, including the cost of the pepperoni?
If 9 measurements are randomly selected from this population, what is the probability that the sample mean will exceed 104?
What conditions are necessary for your calculations? For a party with 35 clients, use part (a) to estimate a range of dollar values for Collete's total sales at that party.