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Let a random sample be taken of size n = 36 from a population with a known standard deviation of =3. Suppose that the mean of the sample is . Find the 95% confidence interval for the mean, , of the population from which the sample was drawn. (Round the values to whole numbers for your confidence interval.)
When is regression used? What are the assumptions of Linear Regression? What is correlation? How does it differ from regression? What is the interpretation of the correlation coefficient?
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
You are appraising the quality of diamonds for your importer. A diamond without a clear center (opaque center) shall be downgraded and sold at discount.
How large a sample should be taken if the desired margin of error E is:
Vince Showers, Managing Director for Sleaz Entertainment, claims that the average age of their customers is at least 23. If this is not the case, Showers will face charges of violating local ordinances regarding public decency.
What is the expected number of baby girls in the sample of 40 births? What is the standard deviation of this binomial distribution?
Estimate the probability that the machine will overflow an 8 oz cup.
Determine pearsons correlation coefficient and comment on the value obtained. Obtain a regression equation representing the above data. Estimate the production batch size for a direct labour cost of R350-00.
The computed value of chi-square: Which of the following is true about the F distribution:
The diameters of a wooden dowel produced by a new machine are normally distributed with a mean of 0.55 inches and a standard deviation of 0.01 inches. What percent of the dowels will have a diameter less than 0.57?
Speaking to a group of analysts in January 2006, a brokerage firm executive claimed that at least 70% of investors are currently confident of meeting their investment objectives.
What happens to the Maximum Error of Estimate as the sample size gets larger?
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