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A study of pollutants showed that certain industrial emissions should not exceed 2.5 parts per million. You believe a particular company may be exceeding this average. To test this supposition, you randomly take a sample of nine air tests. The sample average is 3.4 parts per million, with a sample standard deviation of .6. Does this result provide enough evidence for you to conclude that the company is exceeding the safe limit? Use α = .01. Assume emissions are normally distributed.
At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.
Find the critical t-value that corresponds to 90% confidence. Assume 90 degrees of freedom.
A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair (in days)
The standard deviations s1 and s2 can be used when Ó1 and Ó2 are unknown and you believe that the underlying distribution is normal. Then, you would use s1 and s2 with the t-test for hypothesis testing.
find the weighted mean for three exams if the first one was worth 20 and the student received a 80 the second was
Whirltag claims that the useful lifetime of its dishwashers is normally distributed with a mean of 3 years and a standard deviation 1 year.
When the underlying average of a time series is very stable and there is no trend, cyclical, or seasonal influences,
which of the following would produce a standard error of 2 points? explain your response.n 25 scores from a population
Solve the problem: According to police sources a car with a certain protection system will be recovered 94% of the time. Find the probability that 4 of 8 stolen cars will be recovered.
Show all necessary components of a full hypothesis test, including a source table - Can the office determine if there was a significant difference between the waiting room conditions
The diameters of peaches in a certain orchard are normally distributed with a mean of 3.85 inches and a standard deviation of 0.42 inches. Show all work.
Then describe trade-offs which will happen when you lower sample to $10,000 to meet their budget.
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