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Find the critical value for zα/2 that corresponds to a degree of confidence of 98%.
Sears conducted a quality control study on the car batteries that customer purchase off of the shelf. 50 batteries are selected and it is determined that 6 are defective and 44 are functioning properly. This is a binomial experiment. Select the appro..
Consider a class in which there are 40 students enrolled. (In what follows, ignore February 29th)John is a student in this class. What is the probability that at least one other student in the class has John's birthday (Day and month, but not necessa..
The general population one woman in ten will develope breast cancer research has shown that 1 woman in 600 carries a mutation of the brca gene seven out of 10 woman with this mutation develop breast cancer. he probability that a selected woman will..
The following data represent the monthly service fee in dollars if a customer's account falls below the minimum required $1,500 balance for a sample of 26 banks
Run the Wilcoxon rank-sum test to show whether there is a statistically significant difference between the mortality rates of children under the age of five years of the regions
H0: pi1- pi2 .01 at alpha =.05 where p1=.08, p2=.035, n1 = 200, n2 = 400. Indicate which test you are performing; show the test statistic and the critical values and mention whether one-tailed or two-tailed.
It has been found from past experience that of the articles produced by a factory, 20% come from machine 1, 30% come from machine 2 and 50% come from machine 3. The percentages of satisfactory articles among those produced are 95% for machine 1, 85% ..
The personnel department of a large corporation wants to estimate the family dental expenses of its employees to determine the feasibility of providing a dental insurance plan. There are a total of 2,931 employees at the corporation.
Compute the sample mean and compute the sample variance and sample standard deviation - What is the average miles per gallon for city driving?
Firebrick Tire Company wants to increase sales of its long running, low-end Roadmaster Tire brand with anew advertising campaign promoting they will last at least 28,000 miles [Mu=28,000 miles]. Tests with arandom sample [n=30 tires] show a sample m..
Unions often oppose imports from what they call low-wage countries and advocate trade barriers to protect jobs from what they often characterise as "unfair" import competition". Critically analize this statement
Suppose a sample of 10 statistics books gave a mean price of $ 48 and a sample of 8 mathematics books gave a mean price of $ 49. Find the mean price of a book of statistics or mathematics
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