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In a recent year, the average price of a Microsoft Windows Upgrade was $90.38 according to PC Data. Assume that price of the Microsoft Windows Upgrade that year were normally distributed, with a standard deviation of $8.53. If 36 retailers of computer software are selected that year, what is the probability the price of the upgrade was between $83 and $87?
Use the p-value approach and test to determine if the average yearly income of marketing managers in the East is significantly different from the West.
Transportation officials tell us that 80% of drivers wear seat belts while driving. What is the probability that between 538 and 546 drivers in a sample of 700 drivers wear seat belts?
it has been shown that people drive 5 - 10mph faster than the posted speed limit on a highway. it has been thought that
What is the probability that the number of granite selected for analysis is within 1 standard deviation of it means value.
Find a 95% confidence interval for the mean of all drinks dispensed by this machine if a random sample of 36 drinks has an average content of 2.25 deciliters.
Identify the dependent variable for this study and what scale of measurement (nominal, ordinal, interval, or ratio) is used to measure the dependent variable?
Suppose that 80% of all batteries have acceptable voltages, and let y denote the number of batteries that must be tested. What is p(2), that is, P(y=2).
Compute the effect size for each of the following average SAT math scores. Remember SAT math is standardized such that u= 500 and standard deviation =100.
Finally, the when large plant is built and the demand happens to be high, the net present value of the profits $800,000. Draw a decision tree.
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
Suppose a random sample of size 64 is drawn from a population with a mean of 277. If 90% of the time the sample mean is less than 280, what is the population standard deviation?
True mean number of years to retirement of its employees to within one month of the true mean and with 90% confidence if the range of the data is 7 years?
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