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A chemical company has three plants. Due to a shortage of labor and the intense heat involved in production, only one plant is operated at a time, and operations are shifted every few days to another plant. The company wants to estimate the relationship between daily production Y and the independent variable, labor force present X1. Since the company knows that differnces may exist among the different plants, it proposes a qualitative variable X2 also be used. The variable is defined as X2=1 if plant A is used, 2 if plant B is used, and 3 if plant C is used during the day.
a. Would you use this regression model? Why or Why not?
b. Please write the regression model that you would use and write descriptions for all variables and coefficients.
If sample of size 10 packages is randomly chosen, and 5 percent rate holds, determine the probability that exactly 2 packages in the sample arrive late?
Thompson Machine Works purchased several new, highly sophisticated machines. The production department needed some guidance with respect to qualifications needed by an operator. Four variables were listed.
A IRS auditor randomly selects 3 tax returns from 48 returns of which 9 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places.
A contingency table has 5 rows and 4 columns. How many degrees of freedom are there?
Determine (a) the 90% confidence limits, and (b) the 97% confidence limits for an estimate of the mean diameter of all the rivets produced by the machine in a day.
Draw the appropriate conclusions with respect to female and male human resource manager salary levels. Calculate the t value for independent groups for the following data. Check the accuracy of your calculations.
A meat processing plant has processed an average of 100 tons per day for the last several years. Newer processing machines have been installed recently.
A random sample of n=36 is taken resulting in a sample mean of 63 and s=9. conduct the appropriate hypothesis test and make a decision.
Random sample of 250 americans is selected, the mean of this sample belongs to a sampling distribution. What is the shape of this sampling distribution?
express courier service has found that the delivery time for packages is normally distributed with mean 14 hours and
A salesperson makes four calls per day. A sample of 100 days gives the following frequencies of sales volumes.
Compute a value V that enables us to state, with 90 percent confidence, that population variance (sigma^2) is less than V.
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