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Question: In controlling the quality of a new drug, a dose of medicine is supposed to contain an average of 247 parts per million (ppm) of a certain chemical. If the concentration is higher than 247 ppm, the drug may cause some side effects; and if the concentration is below 247 ppm, the drug may be ineffective. The manufacturer wants to check whether the average concentration in a large shipment is the required 247 ppm or not. A random sample of 60 portions is tested, and the sample mean is found to be 250 ppm and the sample standard deviation 12 ppm. Test the null hypothesis that the average concentration in the entire large shipment is 247 ppm versus the alternative hypothesis that it is not 247 ppm using a level of significance α = 0.05. Do the same using α = 0.01. What is your conclusion? What is your decision about the shipment? If the shipment were guaranteed to contain an average concentration of 247 ppm, what would your decision be, based on the statistical hypothesis test? Explain.
Find probabilities for the Exactly one of the five individuals is left-handed.- At most one of the five individuals is left-handed.
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This problem related to Basic Statistics and it discuss about the different methods in sampling. Two sampling methods to research in the IT field have been given in the solution
At a recent sales meeting, one of the staff presented a histogram of the zip codes of the last 500 customers, so that the staff might understand where sales are coming from. Comment on the usefulness and appropriateness of the display.
The standard error of the estimate (standard error) is the estimated standard deviation of the distribution of the independent variable and in Regression Analysis if the variance of the error term is constant, we call it the Heteroscedasticity prope..
Find the probability that, out of the 6 people chosen, exactly 5 people use a tax preparer. Find the probability that, out of the 6 people chosen, 4 or 5 people use a tax preparer.
it is found that when a particular 4-sided die is rolled a 1 occurs 25.8 of the time a 2 occurs 24.6 of the time a 3
When two variables are correlated (such as strength and running speed), it also means that they are associated with one another. But if they are associated.
A linear regression model has a slope of â?"2.5 and an intercept of 10. The sample coefficient of determination is 0.50. What is the value of the sample correlation coefficient?
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