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1. Name one way in which van motors differ from vane pumps.
2. Can a piston pump be used as a piston motor?
3. For a hydraulic motor, define volumetric, mechanical, and overall efficiency.
4. Why does a hydraulic motor use more flow than it theoretically should?
Verify that the "Conditions for Probabilities for Discrete Random Variables" given on page 267 are met.- Draw a picture of the probability distribution function.
the p-value of a hypothesis test is 0.0345.which of the following claims is correct?a reject ho at the 0.05
Would you say the event that a newborn baby is a boy is a random event? If so, what is the probability of this random event? Explain your reasoning.
A transportation company wants to estimate the average length of time goods are in transit across the country. A random sample of 20 shipments gives x = 2.6 days and s = 0.4 day. Give a 99% con?dence interval for the average transit time.
Their average age was 19.1 years with a standard deviation of 1.5 years. What is the best point estimate for the population mean?
What is the difference between a z-test and a t-test? When estimating population mean, how would you determine the optimal sample size when the maximum error limit is known
A random sample of eight adults aged 30 years were asked how much they spent on medical costs in the year 2011. The following data were measured. Compute the sample standard deviation.
Suppose a batter's average (number of this per at bat)is .300 over the season to date. What is the probability that the batter gets one hit in the next.
How large a sample of one-bedroom apartments would be needed to estimate the mean within $20 with 90% confidence?
What is the probability that a randomly sampled battery of this type will last between 15 and 17 hours?
A test consists of 10 true-false questions. Suppose a student answers the questions by flipping a coin. Let X denote the number of correctly answered questions.
If the sample size had been 8 patients instead of 50, what further assumption(s) would have been necessary in order to solve this problem?
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