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As a statistician, you are asked to give advice on designing a customer appreciation event for the bookstore. The bookstore plans to put one blue ball and nine red balls in a black box. If a customer draws the blue ball from the box they are awarded a bookstore gift card. They expect that 400 customers will participate in the event. After each draw the ball is replaced in the black box.
(a) Identify the mean and the standard deviation of the proportion of the customers who manage to pick the blue ball among the 400 customers.
(b) How many gift cards should they have in order to have enough gift cards prepared with at least 97.5% probability to award every customer who picks the blue ball?
Following data from an x bar chart, is the process capable (capability index>1.33)?
Calculate a sample mean and standard deviation and then reject shipment if the sample average falls below some agree-upon value.
The following random sample was collected: 22 33 44 6 The 80% confidence interval for the mean is?
A standard deviation of 1.9 pounds. What is the 95 percent confidence interval for the true mean weight, u, of all packages received by the parcel service?
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
probability using pareto chart.1. use the pareto chart which shows the results of a survey in which 500 adults were
At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
A sample of 30 cookies is taken to test the claim that each cookie contains at least 9 chocolate chips. The average number of chocolate chips per cookie in the sample was 7.8 with a standard deviation of 3.
A certain type of light bulb that is used on a projector has a Weibull distribution with parameters α=2, and β=3. Compute the following: The probability that the bulb will last 6.
According to the Chebyshev rule, at least what percentage of the observation in any data set are contained within a distance of 3 standard deviations around the mean.
Design a Huffman source coding scheme that can achieve lossless transmission with lessthan 90 bit/second.
What is the probability of getting a number less than 5 on both?
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