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A national study has determined that people who work full time average 43.4 hours worked per week. Assume that the number of hours worked per week for those who work full time is normally distributed. Suppose 12% of these workers work more than 48 hours. Based on this percentage, what is the standard deviation of number of hours worked per week for those workers.
Data were collected for a sample of 64 customers. Assume a population standard deviation of $6. At 95% confidence, what is the margin of error?
Are all the events in this distribution mutually exclusive? Describe in detail.
In a sample of 12 bank tellers at a local branch office, the 7 tellers who have completed the advanced training program offered by the bank have a lower average error rate in the processing of transactions than the remaining 5 tellers.
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power if a two-sided test is used with α = .05
Defects will go into product assembly and will have to be replaced later at a cost of $10 each when they are detected in finnal product testing.
Suppose that you're charged with comparing results of standardized tests from four different school districts. What statistical technique would you choose to use?
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
In general, when the dependent variable is neither interval nor ratio in level of measurement -- i.e., is not numeric -- a nonparametric statistical test is required to test the null hypothesis.
Administrators at a university are planning to offer a summer seminar. It costs $3000 to reserve a room, hire an instructor, and bring in the equipment. Assume it costs $25 per student for the administrators to provide the course materials.
a) What is the purpose of sampling? b) What are some concerns and dangers of sampling?
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a test of sample means or sample proporti..
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