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The manager of a manufacturing company believes that experience is the most valuable variable in determining a worker's productivity. She collects data on productivity of 10 workers with known number of years of experience. The data collected are given bellow.
a) Fit a linear regression model to these data
b) Determine the coefficient of determination R^2
c) Determine the estimate of the error variance
d) Find a 95% confidence interval for the regression parameter B1 and use this confidence interval to test the hypothesis H0: B1=0 versus H1: B ? 0. What is the level of significance for the test?
there are assumptions of multiple regression. one of them is the residuals are independent. this means that successive
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A loaf of bread is normally distributed with a mean of 22 oz. and a standard deviation of 0.5 oz. What is the probability that a loaf is less than 22.25 oz.?
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national exercise rate is 20%. The researcher gathers a random sample of 120 individuals who live in California and find..
In an article appearing in Today's Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75
Determine the probability that gas tank's capacity is above 15.25 gallons?
Suppose we analyzed the effect of grade point averages on grades in a specific class and found the results to have an R-aquared value of 0.53. What do we know? Are there other factor, neith or fifty three percent of the variability?
Sample mean = $40,000, sample standard deviation =$1500 and n= 25. Assume that the population from which the sample is drawn is normally distributed.
The data results are based on serum continine levels for each group. The claim is that exposure to tobacco smoke (as second-hand smoke) corresponds to higher levels of cotinine.
Construct a 90% confidence interval for the mean percentage of hotel reservations being cancelled on the day of the booked stay that falls between 1.1%-3.4%.
What is the probability that the average length of a sheet is between 30.08 and 30.32 inches long and construct a 99 percent confidence interval around the mean annual expenditure in the bar.
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