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An automotive expert claims that the large number of self-serve gasoline stations has resulted in poor automobile maintenance, and that the average tire pressure is more than 4 pounds per square inch (psi) below its manufacturer's specification. As a quick test, 50 tires are examined, and the number of psi each tire is below specification is recorded. If we assume that tire pressure is normally distributed with σ = 1.5 psi, can we infer at the 10% significance level that the expert is correct? What is the p-value?
You calculate the difference in income as (after incentive plan - before incentive plan). You want to test whether income after the incentive plan is different from income before the incentive plan. What are the hypotheses for this test?
At a 5% level of significance, is there enough evidence from this survey to conclude that more than half of all adults would rather have $100 than a day off?
Elucidate correlation coefficient of determination R-square also Adjusted R-square. A computer utility was implimentated to the data collected in a study of a generalized health.
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
Constructing histogram, Using a normal probability plot, Plotting residuals versus x values.
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
What does the coefficient of determination tell you about the variation in attendance and the variation in the number of exhibitors?
For a given confidence interval, what is the interpretation of a 96% confidence level?
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1%.
At one excavation site 8641 pot shards have been found that not yet been cleaned and identified. What is the probability that:
Based on these data, does it seem that strength of relationship between sales and promotions expenditures is enough to permit using linear regression forecasting model? Describe why?
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
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