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A company manufactures batteries for watches. A random sample of 169 batteries is taken and the sample mean life is 5.5 years with a standard deviation of 0.6 years. If you were constructing a 99% two-sided confidence interval estimate, the lower limit would be?
For the grand opening, an arena has selected 5 finalists, each of whom will win a season ticket located in one of 5 sections: The upper balcony, lower balcony, main floor, courtside, or a luxury box.
A population whose shape is unknown has a median of 75. You selected a sample of 40. The standard deviation of the median is 5. Calculate the probability that the median of the sample or average medians is:
What is the probability that two of absent students were girls.What is the probability that two of absent students were boys.
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
The following data was randomly drawn from a normal population. At an alpha level of .05, does the mean of the population differ significantly from -150. Use Excel.
Assume duration of human pregnancies follow mound-shaped distribution with mean of 266 days and the standard deviation of 16 days.
What are some conditions under which business decisions are made using subjective probability concepts? Could you please cite two examples of subjective probability.
Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used during the Spring 2007 semester at Iowa State was selected.
Find out the slope, b, and the intercept, a, for the least-squares line. Write the equation of the least squares line.
Explain the logic of what you have done to a person who is unfamiliar with the analysis of variance.
Determine the proportion of variation in grade that can be explained by the linear correlation between the grade and the number of credit hours earned at the same time of taking the course.
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