SOLUTION: Salesmen for the ABC Plastics Company drive an average of 240 miles per day with a standard deviation of 36 miles. If samples of 25 daily mileages are taken, what is the standard d
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-> SOLUTION: Salesmen for the ABC Plastics Company drive an average of 240 miles per day with a standard deviation of 36 miles. If samples of 25 daily mileages are taken, what is the standard d
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Question 984220: Salesmen for the ABC Plastics Company drive an average of 240 miles per day with a standard deviation of 36 miles. If samples of 25 daily mileages are taken, what is the standard deviation of the distribution of sample means?
6.8
7.0
7.1
7.2
Is Drug B superior to the currently used Drug A in treating pancreatitis?
Observational
Case-controlled observational
Double blind experiment
Single blind experiment
A manufacturer wishes to test the claim that one of its pancake mixes has a mean weight that does not equal 24 ounces as advertised. Determine the conclusion of the hypothesis test assuming that the results of the sampling lead to rejection of the null hypothesis.
Conclusion: Support the claim that the mean is greater than 24 ounces.
Conclusion: Support the claim that the mean is not equal to 24 ounces.
Conclusion: Support the claim that the mean is equal to 24 ounces.
Conclusion: Support the claim that the mean is less than 24 ounces.
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Problem
Salesmen for the ABC Plastics Company drive an average of 240 miles per day with a standard deviation of 36 miles. If samples of 25 daily mileages are taken, what is the standard deviation of the distribution of sample means?
6.8
7.0
7.1
7.2
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Standard Error = sigma/sqrt(n)
Standard Error = 36/sqrt(25)
Standard Error = 36/5
Standard Error = 7.2
The standard error, aka the standard deviation of the sample means, is 7.2
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