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Suppose a manufacturing company makes a certain item. The time to produce each item is normally distributed around a mean of 27 minutes with a standard deviation of 2.5 minutes. Thus, the population of production times is normal in shape. Find the mean and standard deviation of the sample. Assume an n=100.
What is the point estimate of the students mean salary? What is the point estimate of the standard deviation of the students salaries? Construct a 95% confidence interval for the mean salary of the DM students?
if we have a 95 confidence interval we have alpha2 below the confidence interval and alpha2 above the confidence
He randomly selects a sample of 10 items of the procduct from a large lot ready to be shipped. He (given that) the true proportion of perfect condition items is only 80% what is the probability that the lot will not be shipped?
Use an appropriate 95 percent confidence interval to estimate the difference between the mean prices of the two brands of cd players. Do you think that the difference haspractical importance?
If 5 men and 5 women are to be chosen randomly and then paired off, what is the probability of a given pair (Alice-Bob) to be formed?
Pilots who cannot maintain regular sleep hours due to their work schedule often suffer from insomnia. A recent study on sleeping patterns of pilots focused on quantifying deviations from regular sleep hours.
determine the x2 percentile that is required to construct each of the following cisa confidence level 95 degrees of
For a given confidence interval, what is the interpretation of a 96% confidence level?
if a data set has correlation coefficient equal to 0.9 which of the following is necessarily true about the data points
rolling a pair of fair die 10 times and recording the number of times we get a 7. what is the probability of rolling
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
Find a research article and clearly define both the null and directional hypothesis that was or could have been tested during the statistical analysis of the data.
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