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It is believed that using a solid state drive (SSD) in a computer results in faster boot times when compared to a computer with a traditional hard disk (HDD). You sample 13 computers with an HDD and note a sample average of 30.74 seconds with a standard deviation of 6.37 seconds. A sample of 19 computers with an SSD show an average of 12.28 seconds with a standard deviation of 2.664 seconds. Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
1) We only have the sample means, we need to know the population means in order to calculate a confidence interval.
2) (14.26, 22.66)
3) (16.83, 20.09)
4) (12.95, 23.97)
5) (13.98, 22.94)
Assume if random samples of size n = 9 are selected can we say anything about the distribution of sample means.
Make up a scatter diagram with 10 dots for each of the following:
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Calculate the expected value and standard deviation of the value.
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Find a 99% confidence interval for the difference in the mean number of calls between night and day.
Recognize and describe potential threats (up to 3) to internal validity.
Public transportation and the automobile are 2 methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
Explain how one extreme score influences mean and standard deviation.
How many subsets of S contain either the number 6 or the number 15?
Muscular dystrophy is an incurable muscle-wasting disease. The most common and serious type, called DMD, is caused by a sex-linked recessive mutation. Specifically; women can be carriers but do not get the disease; a son of a carrier has probabili..
Recent actual and forecasted data for product XYZ is given in the following table.
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