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A government agency was charged by the legislature with estimating the length of time it takes citizens to fill out various forms. Two hundred randomly selected adults were timed as they filled out a particular form. The times required had mean 12.8 minutes with standard deviation 1.7 minutes. Construct a 90% confidence interval for the mean time taken for all adults to fill out this form.
Target pistols are manufactured in six cities. The following table gives the percent of the total production that comes from each city.
If we wish to have a 90% confidence interval, what would be the value of a/2? Show how you arrived at this answer.
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.
1. the length of time in minutes required to complete a series of physical therapy exercises is normally distributed
What decision should be made regarding the null hypothesis?
Based on the custom "rule-of-thumb" for estimating the standard deviation, if the range of prices for a product sold in Kansas City is between $99 and $349, an estimate of the standard deviation of the prices would be about:
Developing a linear programming problem using Commuter Bus scheduling to minimize the total cost.
The production process for Bicycles can be described as taking Components and adding value to transform these into a Bicycle. The Home country applies a 20% import tari¤ at both stages of the production process:
If our decision in a hypothesis test is to fail to reject the null hypothesis, then do we know that the null hypothesis must be true?
Let X and Y have the bivariate normal distribution, as in Example 2.7.9. Prove that X and Y are independent if and only ifP= 0.
Find an example of a poll based on a self-selected sample. Report the wording of the questions and the number who chose each response. Comment on whether or not you think the results can be extended to any population.
What price should the manufacturer charge the type 1's? How large a discount could the coupons offer without tempting the type 1's to use them?
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