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1. A 400-V DC shunt motor has ?eld and armature resistances of respectively 100 and 0.1 Ω. If the motor absorbs 40 kW from the electric grid, calculate:
(a) the line, armature, and ?eld current(b) the electromotive force(c) the ef?ciency
2. The 400-V DC motor of the previous exercise is running at 1100 rpm and absorbing a line current of 80 A. Calculate the torque developed and the ef?ciency.
One of these has a history of selling an average of 200 items, with a standard deviation of 20. If he wants to maximize his profits, how many should he order?
On the basis of these results, do you think retailers and consumers have a right to complain to the manufacturers? Why?
Describe an example and identify the variables within your population (work, social, academic, etc.) for which you might expect interactions?
A random sample of 2000 students showed that 860 were in favour of more movies on campus. Calculate the sample proportion for this result? Give your answer as a decimal fraction to 2 decimal places.
the proportion of customer who rated service as either good or excellent was .65 p.65 you would like to know if
1. other things being equal as the sample size increases the standard error of a statistica. increasesb.
Using the .05 level, what should the experimenter conclude? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
1.a researcher is interested in comparing sat scores for students enrolled in public schools private schools and those
The actual proportion of doctors is less than 90%, a random sample of 100 doctors resulted in 85 who recommended brand Z. The test statistic is approximately?
Identify the significance level, the test statistic, and the critical value, state whether you are rejecting or failing to reject the null hypothesis statement and explain how the results could be used by the manager of the company.
A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. 13. At a = 0.05, what is the test value?
crude oil of specific gravity 0.86 is to be pumped at 20c. what is the min pipe size that can be used in order to
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