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A computer manufacturer is about to unveil a new, faster personal computer. The new machine clearly is faster, but initial tests indicate there is more variation in the processing time. The processing time depends on the particular program being run, the amount of input data, and the amount of output. A sample of 16 computer runs, covering a range of production jobs, showed that the standard deviation of the processing time was 22 (hundredths of a second) for the new machine and 12 (hundredths of a second) for the current machine. At the .05 significance level can we conclude that there is more variation in the processing time of the new machine?
Compare the means of two populations using 96% confidence interval:
If μ represents the mean increase in the verbal SAT score if all high school students used the method, the alternative hypothesis the teacher wishes to test is what?
You sample a group of computers and use the sample statistics to calculate a 95% confidence interval of (-10.95, -1.5). This interval estimates the difference of (average boot time (HDD) - average boot time (SSD)). What can we conclude from this i..
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
The researchers gave each subject a battery of nine separate neurological and psychological examinations designed to assess their mental capabilities.
Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
Suppose the weight of a product is normally distributed with a mean of 1.5 and a variance of 0.2. What percentage of products will have weights within +/- 3 standard deviations? Critically discuss the lower and upper limits bounding 50% of product we..
A sales person at a company sold 6,903,435 of hardware equipment last year, a figure that represented the eighth decile of sales performance at the company. What can you conclude about the salesperson performance?
Assume if the students toss the coin 200 times each about 68% should have proportions among what two numbers.
2 laptops are chosen at random without replacement, what is the probability that both are high priced?
They also know that the distribution of loss from fire has a skewed distribution; many have $0.00 losses and a few have large losses.
Determine the probability that: a) Exactly 3 will have this mild side effect.
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