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Nationwide, the average time until a electric utility customer service representative answers a call is 260 second. The Gigantic Kilowatt Energy Company rnadomly sampled 30 calls and found that, on average, they were answered in 227 second with a population standard deviation of 40 seconds. Can the company claim that they are faster than the average utility at a = 0.05?
a) yes, because the test value -4.52 falls int he critical region
b) no, because the test value -0.83 falls in the critical region.
c) yes, because the test value -0.15 falls in the critical region.
d) no, because the test value -0.15 falls in the critical region.
Identify each of the following variables are qualitative or quantitative
You've two separate sets of data. From one set you calculate the standard error to be 500. From the other set, the standard error was 5.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly.
Country A and Country C spends about the same amount on average per person per year. Which has the greater spread?
The Central Limit Theorem states that the sampling distribution of means is:
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If the sum of squares total is 800 and the sum of squares error is 170. What is the r-squared value?
Determine probability of waiting less than 12 minutes between successive speeders. By using cumulative distribution function of X.
How does multilinear regression analysis apply to your profession? Specify the dependent value and the set of predictors. Where would you get the data?
A produce manager wants to estimate the mean size of coke bottle fills with 95 percent confidence. A preliminary sample of 12 bottles shows a sample standard deviation of 3 mil, and mean of 500.
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