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If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values.
(a) what coded value do you assign to X for the first year in the series?
(b) what coded value do you assign to X for the fifth year in the series?
(c) what coded value do you assign to X for the most recent recorded year in the series?
(d) what coded value do you assign to X if you want to project the trend and make a forecast five years beyond the last observed value?
You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenien..
Based on this information, by what factor does the risk of having an accident increase due to driving while intoxicated?
What is the probability that at least 8 of the next 15 errors are due to operator errors? What is the probability that no more than 3/10 failures are due to operators?
The American Automobile Association checks the prices of gasoline before many holiday weekends.
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
All of these cars are for sale by dealers. Produce a dotplot of the prices and comment on features of the dotplot. Suggest a reasonable asking price for the 2005 Escape. Explain your reasoning.
Complete the test at the 5% level of significance.
Recognize independent variable and dependent variable for this experiment. Think in your head what influences what? Or, what causes what? Cause is independent variable.
Can the company claim that they are faster than the average utility?
Taking α to be 0.05, what is/are the critical values associated with testing your hypothesis?
The supermarket is open 16 hours per day. What is the probability that the total number of customers who enter the supermarket in one day is greater than 10,000?
In the past few years out sourcing over seas has become more frequently used than before by U.S. companies. However, out souring is not with out problems. A recent survey indicates that 20% of the companies that outsource over seas use consultant.
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