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A tire manufacturer claims his best product has an average lifespan of exactly 14 years. A skeptical product evaluator asks for evidence (data) that might be used to evaluate this claim. The product evaluator was provided data collected from a random sample of 50 people who used the product. Using the data, an average product lifespan of 13 years and a standard deviation of 2 years was calculated. Does the data indicate, at the significance level 0.05, that true mean lifespan of the product is less than that of the claimed average lifespan? Select the [Alternative Hypothesis, Value of the Test Statistic].
A wholesaler has recently developed a computerized sales invoicing system. Prior to implementing this system, a manual system was used. The distribution of the number of errors per invoice for the manual system is as follows
List the elements of the sample space S using the letters G and D for good and defective respectively. What is the mean number of defective hard drives that the small business receives if all their shipments come in sets of five that contain the sa..
For the period from 1918 to the present, in a random sample of 9 wolves spotted in the region, what is the probability that 6 or more were male.
Profitability at a bank is declining as customers are shifting to other banks. As a researcher, identify the problem (root cause of the symptom) through a scientifically crafted research proposal.
Suppose we have run a regression on 48 months of data and the regression equation is Y = 50000 + 1000*x (where x is the month number).
A particular medical operation proves fatal in 1% of the cases. Find an approximation to the probability that there will be at least 2 fatalities in 200 operations.
Find the least squares regression line by deciding which are the appropriate independent and dependent variables and calculating the equation of the line. State equation of line.
Intersection of two mutually exclusive events: can be any value between 0 to 1, must always be equal to 1.
The iq test score are normally distributed with a mean of 100 and a standard deviation of 15. Determine the probability that the person would score 130 or more on the test?
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcox on rank-sum test, evaluate the significance of the results, assuming there are no ties.
The 46 computer mice inspectors at a particular factory can only inspect 45 mice per hour. Does the company have reason to believe that these inspectors are slower than average at α = 0.10?
The data represents the closing value of the Dow Jones Industrial Average (DJIA) over the 29-year period from 1979 to 2007.
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