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A poll of 1100 randomly selected students in grade 6 trrough 8 was conducted and found that 47% enjoy playing sports. would confidence in the results increase if the sample size were 3600 instead of 1100. why or why not?
Truck tire life is normally distributed with a mean of 60,000 miles and a standard deviation of 4,000 miles. You bought four tires. What is the probability that the average mileage of the four tires exceeds 66,000 miles?
Prepare a mixed integer programming model for this problem.
Assuming that the process is operating correctly according to specifications, what is the probability that a sample will indicate that an adjustment is needed?
Suppose you are testing the differences in attitudes toward health care reform using Democrats, Republications, and Independents. What statistical test would you use?
The manufacturer of Winston Tire Company claims its new tires last for an average 40,000 miles. An independent testing agency road-tested 20 tires to substantiate the claim made by the Winston Tire Company.
X is a normally distributed random variable with mean 10 and variance 24. a. Find P(X bigger 14) b. find P(8 smaller X smaller 20)
Suggests a survey of area restaurants to see if the situation is pervasive. What do you think of this research suggestion? How could you improve on your boss's formulation of the research question?
Powers Tire Company (Which specializes in tires for vehicles ca. 1965) needs your expertise to help them schedule over the next three months. They can make tires using regular labor, or subcontracting.
The caffeine content of 20 brands of regular coffee is shown below. 80 82 89 85 87 30 33 44 40 46 50 55 60 62 71 90 92 75 63 65. Thus, this job helps to construct a Frequency Distribution with a class interval of 10, starting with 30.
State the null and alternate hypotheses, the decision rule, find the test statistic, state your decision, and estimate the P value for the following:
Use the binomial distribution in the Data Analysis add - in to simulate the distribution of men and women among the next ten arrivals at an emergency room, assuming that, on average, six people out of ten who arrive are men.
In brief describe three situations in which the 'First In First Out' discipline rule is not applicable in queuing analysis. Provide examples of four situations in which there are limited, or finite population.
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