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A study of business faculty at state supported institutions in Ohio revealed that the arithmetic mean salary for nine months is $52,000 and a standard deviation of $3,000. The study also showed that the faculty had been employed an average (arithmetic mean) of 15 years with a standard deviation of 4 years. How does the relative dispersion in the distribution of salaries compare with that of the lengths of service?
Formulate an appropriate hypothesis test to examine at the 10% level of significance whether the manager's worries are justified.
A United Nations report shows the mean family income for Mexican migrants to the U.S.. is $27,000 per year. A FLOC evaluation of a sample 25 Mexican families units reveals a mean to be $30,000 with a sample standard deviation of $10,000.
ll subjects in the study were questioned about lifestyle factors including alcohol, tea, and coffee consumption. The resulting data.
If 200 passengers take this flight, find the binomial and Poisson probability of no platinum flyers (round your answer to 4 decimal places).
A normal tomato will gain an average of 2 ounces per week during the growing season. A sample of 100 tomatoes is given a special hormone to increase their growth.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 3.3 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
Does the data prove a significant difference in mean times?
Describe what type of control chart you can use and how do you calculate the control limits (provide formula) to check if the calculate the control limits in this organization is in control.
You are the quality control manager at Mars, Inc and you want to prove the company's claim that 10% of all M & M candies are blue. Is it possible to prove that claim using methods of hypothesis testing? Why or Why not?
What is the net income of SouthCo if unit sales are twice the break-even point for a given month?
Suggest one psychological research question that could be answered by each of the following types of statistical test:
A national Retail Foundation survey found housholds intended to spend an average of $932 during the December holiday season. Assume that the survey included 850 households and that the standard deviation of the sample is $215.
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