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A machine fills bottles with 64 fluid ounces of liquid. The quality-control manager determines that the fill levels are normally distributed with a mean of 64 ounces and a standard deviation of 0.42 ounce. He has an engineer recalibrate the machine in an attempt to lower the standard deviation. After the recalibration, the quality-control manager randomly selects 19 bottles from the line and determines that the standard deviation is 0.38 ounce. Is there less variability in the filling machine? Use a 0.01 significance level.
The Awake Coffee Company produces gourmet instant coffee. The company wants to be sure that the average fill of coffee containers is 12.0 ounces.
What sample size would be needed to obtain an error of +/- 10 square millimeters with 99% confidence?
Use the normal-theory method to test for significant differences in 12-month mortality between the two groups.
1.the bootstrap method of inference relies ona.resampling with replacement from the original sample.b.resampling from
consider the minitab output shown below.two sample t-test and cisamplenmeanstdevse
Compute the proper measure of association of smoking and lung cancer.
A Tamiami shearing machine is producing 10 percent defective pieces, which is abnormally high. The quality control engineer has been checking the output by almost continuous sampling since the abnormal condition began. What is the probability that in..
a professional gambler claims that he has loaded a die so that the outcome of 123456 have corresponding probabilities
What sample size would be needed for the estimate to be within 1.5 percentage points with 90% confidence if you do not have a prior estimate?
Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems.
A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years.
A random sample of 11 health maintenance organizations (HMOs) was selected. For each HMO, the co-payment (in dollars) for a doctor's office visit was recorded. The results are as follows:
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