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A company that produces an expensive stereo component is considering offering a warranty on the component. Suppose the population of lifetimes of the components is a normal distribution with mean of 84 months and standard deviation of 10 months. If the company wants no more than 15% of the components to wear out before they reach the warranty date, what number of months should be used for the warranty?
To test whether the significant difference between two sample variance using F-tests.
A developmental psychologist is studying memory development in children. He is interested in determining the exact age at which children began to recall long-term episodic memories.
Choose an article that explains research using one or more statistical tests (z, t, ANOVA, chi square, regression) as part of data analysis. Explain the study using the following information:
Significance level to test the claim that less than half (.5) of all executives identify that error as being the most common job interviewing error.
A portfolio p of consisting 60% of stock X and 40% of stock Y, has a correlation ρpM = 0.62 with the market. What is the portfolio volatility? Statement on the diversification effect.
Find the value of Z-score- standard normal distribution.Find out a value of the standard normal random variable z, call it z0.
Solve different inventory control problems using an appropriate OR method.
Build regression models for predicting house prices. We will be using data collected on 91 houses in Gainesville, Florida. The dataset contains the selling price of each house and information on four other explanatory variables.
Determine the range and standard deviation of the times.
Do the confidence interval limits contain 98.6F? What does the sample suggest about the use of 98.6F as the mean body temp.
Recognize the kind of sampling (random, systematic, convenience, stratified, cluster) employed whenever a sample of people who smoke is obtained as explained below.
A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of$3.02.
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