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The pile P has a mass of 800 kg and is being driven into loose sand using the 300-kg hammer C which is dropped a distance of 0.5 m from the top of the pile. Determine the initial speed of the pile just after it is struck by the hammer. The coefficient of restitution between the hammer and the pile is e = 0.1. Neglect the impulses due to the weights of the pile and hammer and the impulse due to the sand during the impact.
The average age in the sample was 22.5 years with a standard deviation of 5 years. Construct a 95% confidence level. What is the probability that the sample mean will be more than $306.60?
a company produces bolts for large-scale construction projects. the shear strength x of the bolts is assumed to be a
bachelor's degrees; and of 75 male nurses, 34 had bachelor's degrees. If a nurse is selected at random, and the probability that the nurse is? A female nurse with a bachelor's degree.
the organization for equality in the workplace toew is studying the gender gap in starting pay for people with
imagine that there are 100 different researchers each studying the sleeping habits of college freshmen. each researcher
Calculate the standard deviation for this data. Explain why statisticians typically use the standard deviation rather than the average deviation.
the weight of a sophisticated running shoe is normally distributed with a mean of 12 ounces and a standard deviation of
Found that 47% enjoy playing sports. would confidence in the results increase if the sample size were 3600 instead of 1100. why or why not?
Suppose you conduct survey asking people if they support something or if they like some product or if they watch some TV-show.
A researcher administers a treatment to a sample of n = 25 participants and uses a hypothesis test to evaluate the effect of the treatment.
Evaluate 2-month moving average and Exponential smoothing by MAD.
Data collection instrument used in managerial research. Why is it significant to make sure that these data collection methods and instruments are both reliable and valid?
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