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A manufacturer considers his production process to be out of control when defects exceed 3%. In a random sample of 80 items, the defect rate is 5% but the manager claims that this is only a sample fluctuation and production is not really out of control. At the 0.01 level of significance, does the data provide sufficient evidence that the percentage of defects exceeds 3%.
What does it mean to say that a particular value of x has a z-score of -2.1?
According to Chebyshev's theorem, proportion of values from data set that is further than 2 standard deviations from the mean is at most?
In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 500 such persons is drawn, of whom 198 turn out to be currently enrolled in college.
What are the odds against drawing a card from an ordinary deck of cards and getting a spade?
Calculate the z - scores for the three samples, compare the z score to the t-statistic, is the null hypothesis accepted or rejected?
Choice of exponential smoothing constant w has little or no effect on forecast values using exponential smoothing.
Assume that the bricks used are randomly chosen from a population of bricks whose mean length is 10 inches and whose standard deviation is 1/32 inch.
Develop appropriate hypotheses such that rejection of H0 will support the researcher's contention.
Investigate the cost of a home mortgage and to determine the monthly payment.
Construct a scatterplot, find the value of the linear correlation coefficient r, and find the P- value using a= 0.05. Is there sufficient evidence to conclude that there is a linear correlation between systolic measurement and diastolic measuremen..
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
An experiment is designed using three levels of ground clutter and two filter types. The experiment is performed by randomly selecting a treatment combination
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