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A sample of 35 different payroll departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days, find the 90% confidence interval for the average number of days worked by all employees who are paid through payroll departments.
the distribution of grades on a certain test has a mean of 85.5 with a standard deviation of 11.2. there are 400 tests.
Create a 95% confidence interval for proportion of highly educated women who left careers for family reasons and who wish to return to work.
Formulate a suitable null and alternative hypothesis to test the students' claim that they followed their instructor's recommendation at a 5% level of significance and interpret your findings.
If we decrease the level of significance a (alpha) from 0.05 to 0.01, that means we are: More willing to accept a type II error;
suppose that machines m1 m2 and m3 produce respectively 500 1000 and 1500 parts per day of which 5 6 and 7 are
q1. thompson photo works purchased several new highly sophisticated machines. the production department needed some
an office building in new york uses thousands of fluorescent light bulb each year. the brand of bulb it currently uses
Multiple-Choice Questions, High quality research has which of the following characteristics?
What is the probability that a particular arrival time measurement will be in error by less than 0.01 microsecond? What does your answer mean?
Introduction: Human Height and Weight are mostly hereditable, but lifestyles, diet, health and environmental factors also play a role in determining individual's physical characteristics.
for a certain river suppose the drought length y is the number of consecutive time intervals in which the water supply
a bar owner was observing how many drinks his clients had on a saturday night. a sample of 24 customers randomly
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