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1. Classify as independent or dependent samples: White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.
2. Classify as independent or dependent samples: White blood cell counts for a group of volunteers before being innoculated, and white blood cell counts for a second group of volunteers after being innoculated.
3. An aerospace parts factory has two separate production lines making fasteners; each production line can be regarded as creating a separate population of fasteners, whose widths are normally distributed. A sample of 20 fasteners is selected from each production line for quality control inspection. The width of each selected fastener is measured; and the standard deviations s1 and s2 in the measured widths of the selected fasteners from each production line are calculated. If the design standard deviation in fastener width for each production line population is unknown, can the sample values s1 and s2 be used instead?yes or no?
Determine the 95% confidence interval for your estimate what data have you utilized as the basis of your predictions what suppositions have you made.
At a board meeting of 20 businessmen, all of whom wear ties, what is the probability that:
Any person who is familiar with these trees understand the height of a California redwood tree which is related to another characteristics of the tree.
The new study is going to use the confidence level of 90%. The estimator or appreciative must be in 1% of the population proportion. Which is the necessary size of the sample?
What is the probability of the person is 20 to 24 years old.What is the probability of the person is 20 to 34 years old.
Armstrong Faber produces a standard number-two pencil called Ultra-Lite. Since Chuck Armstong started Armstrong Faber, sales have grown steadily. With the increase in the price of wood products.
We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
Is spine bone density is normally distributed in young women with a mean of 1.0 g/cm 2 and a standard deviation of .10 g/cm 2 , then how many young women out of 100 would you expect to have bone densities less than .85 g/cm 2 ?
What then is the probability that a shaft will be acceptable? Suppose that the diameter of the shaft is a random variable that is Normally distributed.
Make up a scatter diagram with 10 dots for each of the following:
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
If random sample of 9 loads is selected for a weight check, determine the probability that mean weight of those loads is more than 40.60 tons.
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