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Computing probability values using normal distribution.
In a population of test scores not known to be normally distributed, the mean is 50 and the standard deviation is 5. What proportion of the observations will fall in the interval from 40 to 60?
Calculate the suitable mean response time from both proposed locations and find out which proposed site must be selected for the new emergency facility.
Graph the distribution using a histogram. Calculate the mean and standard deviation.
Findout the 98% confidence interval for true mean. Findout a 98% confidence interval for the cigarette tax in all 50 states.
Test whether the weight reducers on average will lose less than 10 pounds using P-value approach.
What is your null hypothesis? What is your alternative hypothesis? What your decision about the null hypothesis?
For such groups of 800, would it be unusual to get 687 consumers who recognize the Dull Computer Company name?
Calculate the correlation coefficient. What is the coefficient of determination from these sample statistics? What does this coefficient indicate?
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
Assume 1.5% of antennas on new Nokia cell phones are imperfect. For random sample of 200 antennas, determine the probability that: None of the antennas is defective.
When would you use hypothesis testing and when would you use confidence intervals?
Scatter plot, Correlation coefficient and Regression equation - Do a complete regression analysis by performing the steps below
Suppose the least squares regression equation is Y' = 1,202 + 1,133X. When X = 3, what does Y' equal?
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