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Suppose you want to estimate, with 95% confidence, the population mean force required to break an insulator to within +/- 25 pounds. On the basis of a study conducted the previous year, you believe that the standard deviation is 100 pounds. Determine the sample size needed.
Draw out and analyse descriptive statistics such as means, medians, ranges, deciles, etc to describe income and wealth distribution in Australia, and your ability to consider changes in wealth and income distribution over time
A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
Determine how self confident a person may be. Analysis and Justification. Prepare an analysis of how you developed your instrument.
suppose x is a normally distributed random variable with mu 13 and sigma 2. find each of the following probabilities
Consider a problem with two nodes, 1 and 2, and two arcs (1, 2) and (2, 1). The node supplies are s1 = s2 = 0. The problem is
Who owns a Harley? Harley-Davidson motorcycles make up 14% of all the motorcycles registered in the United States. You plan to interview an SRS of 500.
Describe the sample distribution of p-hat, the sample proportion of college students with cell phones who send or receive text messages with their phones.
Records show that 10% of a certain model of television picture tubes fail before guarantee has expired. A random sample of 7 picture tubes selected.
sam will read either one chapter of his probability book or one chapter of his history book. if the number of
A study in pediatric emergency care compared the injury severity between younger and older children.
Determine whether the coefficient of correlation in the population is zero. Construct and interpret confidence intervals and prediction intervals for the dependent variable, number of units sold.
Identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, ratio level data.
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