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The urinary fluoride concentration (ppm) was determined for 11 randomly chosen livestock both at the beginning of and in the middle of their grazing period
The Production Manager at Hydro-Corn Farming, Inc. is considering hiring 15 additional laborers to harvest the corn supply during the peak season
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years
The breaking strengths of cables produced by a certain manufacturer have a mean of 1750 pounds, and a standard deviation of 60 pound
Ms. Lisa Monnin is the budget director for Nexus Media, Inc. She would like to compare the daily travel expenses for the sales staff and the audit staff
What is the correlation between the two sets of rankings? Is the relationship between behavior in the two classes significant?
The School Committee members of a midsized New England city agreed that a strict discipline code has caused an increase in the number of student suspensions.
Suppose that you want to compare the mean size of health care claims submitted by five groups of policyholders.
Suppose that faculty at my college are assigned overload courses hence additional compensation beyond the required contract hours based on seniority.
Stonefield Homes is developing 2 parcels near Minneapolis, MN. In order to test different advertising approached, they use different media to reach potential
Lemarks Studios is looking for advertiser dollars to help with production costs on its newest blockbuster movie.
The table below shows the scores of a group of 15 students in mathematics and art:
Choose a variable. Before collecting the data, decide what a likely average might be, then complete the following:
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met
Compare the mean of the variable for a sample of 30 for one group with the mean of the variable for a sample of 30 for a second group. Use a z test.
Supporting the null hypothesis would be possible only if we could prove it for 100% of all possible cases.
Variability in a dataset may be caused by various sources. Provide an example sample dataset where one or more than one sources causing its variability.
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office determining that the mean out-of-pocket patient billing above
A coin was flipped 60 times and came up heads 38 times.
The manufacturer of Trilene braided fishing line claims that the average number of gamefish that can be landed before the line needs to be replaced
Describe the action that would result in a type I error and a type II error if each of the following null hypotheses were tested.
Find the critical z value, assume that the normal distribution applies. alpha = 0.005; H1 is p not equal 0.20
Which of the following would be the correct hypotheses for testing the claim that the mean life of a battery for a cellular phone (while the phone is left on)
A nine year old gets 3.65 for allowance. Sample of 45 9 year olds in Tennessee revealed mean allowance 3.69 with a standard dev. of .24 .
A salesman makes 40 calls per week. People complained because they said that estimate was to low. In a random sample of 28 people, the standard deviation