Numerical summary measures
Which of the following numerical summary measures is not sensitive to outliers in a dataset?
II onlyall of thesenone of theseIII onlyI only
range
mean
interquartile range
none of these
standard deviation
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Let d = diastolic blood pressure before diet d-diastolic blood pressure after diet. Assume diastolic readings to be normally distributed. The sample mean difference of the sample is 0.8 and the sample standard deviation of the difference is 2.348.
A wire is formed into a circle having a diameter of 15.0 cm and placed in a uniform magnetic field of 2.90 mT. The wire carries a current of 5.00 A. (a) Find the maximum torque on the wire.
A pump operates at 3000 psi and delivers 5 gpm. It requires 10 HP to drive the pump. Determine the overall efficiency of the pump. If the pump is driven at 1000 rpm, what is the output torque to the pump?
A competency test has scores with a mean of 69 and a standard deviation of 4. A histogram of the data shows that the distribution is normal. Use the Empirical Rule to find the percentage of scores between 61 and 77.
Assume you have a perfectly isolated, closed system under reversible and isothermal conditions where pV 0.8 = 5000kJm?0.6. You start with the system at p1 = 100kPa.
Let p1 and p2 be the proportion of all parts from suppliers 1 and 2, respectively, that are defective. Test whether the defective rates of the parts from two suppliers are significant different at the 5% significance level?
A presser relief valve has a pressure setting of 1500 psi. Compute the horsepower loss across the valve if it returns all the flow back to the tank from a 35-gpm pump.
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