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Load-bearing structures in underground mines are often required to carry additional loads while mining operations are in progress. As the structures adjust to this new weight small-scale displacements take place that result in the release of seismic and acoustic energy called "rock noise." This energy can be detected using special geophysical equipment. Assume that in a particular mine the average number of rock noises recorded during normal activity is three per hour. Would you consider it unusual if more than 10 were detected in a two-hour period? Explain, based on the probability involved. (Based on "A multichannel rock noise monitoring system," T. Gowd and M. S. Rao, Journal of Mines, Metals and Fuels, September, 1981, pp. 288-290.)
Leasing agents from the Triangle Mall Management Corporation have suggested that Sunflowers Apparel considered several locations in some of Triangles newly renovated lifestyle malls that cater to shoppers with higher than mean disposable income.
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Neither Ferrari nor Maserati makes economy cars.
we have an urn with three green balls and two yellow balls. we pick a sample of two without replacement and put these
each private locker in the gym building is labeled with three upper-case alpha characters followed by two base 16
In a random sample of 120 households, what is the probability that greater than 20 households, but, less than 35 households receive a retirement income?
She then uses the mean and standard deviation of these values to estimate the mean value for all parts the operator is making. Construct a 95% confidence interval for the mean value assuming a normal distribution.
How does Z the standard normal distribution variable relate to the standard deviation of its distribution and identify the critical value suitable for conducting a two-tail test of the hypothesis at the 2% level.
Probability of 0.3, and is a draw with probability of 0.3, independently of the previous games. What is the probability that Fischer wins the match?
The Appliance Center has six sales representatives at their North Jacksonville outlet. Listed below is the number of refrigerators sold by each last month.
Suppose you were to make a scatterplot of adult daughters' heights versus mothers' heights by collecting data on both variables from several of your female.
Community college spends each year. If she wishes to be 90% confident, how large a sample is necessary if the standard deviation is known to be $80?
A study of 20 worldwide financial institutions showed the correlation between their assets and pretax profit to be .86. At the .05 significance level, can we conclude that there is positive correlation in the population?
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