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A magnetic tape recorder transport for modern computers requires a high-accuracy, rapid-response control system. The requirements for a specific transport are as follows: (1) The tape must stop or start in 10 ms, and (2) it must be possible to read 45,000 characters per second. This system was discussed in Problem P7.11. We desire to set J = 5 x 10-3 and K1 is set on the basis of the maximum error allowable for a velocity input. In this case, we desire to maintain a steady-state speed error of less than 5%. We will use a tachometer in this case and set Ka = 50,000 and K2 = 1. To provide a suitable performance, a compensator Gc(s) is inserted immediately following the photocell transducer. Select a compensator Gc(s) so that the overshoot of the system for a step input is less than 25%. We will assume that τ1 = τa =0.
The mean number of words per minute read by sixth graders is 89 with a standard deviation of 16. If 66 sixth graders are randomly selected, what is the probability that the sample mean would be greater than 92.25?
a box contains 3 red and 9 blue balls. suppose 5 balls are drawn at randomwithout replacement from the box. let y be
Why are paired t-tests more powerful than independent-samples t-tests?
Following Example 4.21, let X and Y denote the arrival times of the first two calls at a telephone switch. The joint PDF of X and Y is
A certain brand of automobile tire has a mean span of 3500 miles and a standard deviation of 2000 miles. (assume the life spans of the tires have a bell-shaped distribution)
Compute a 90% confidence interval of the mean for a Weschler intellegence test with mean of 100.00 and standard deviation of 15.00 for a sample of 100 people. Use two decimal places.
1. an investment counselor calls witrh a hot stock tip. he believes that if the economy remains strong the investment
Ten bolts were selected randomly from a production line and the diameter of each was measured. Why do these diameters not have a binomial distribution?
De acuerdo con la Agencia Seguros de un Estado, una familia de 4 miembros gasta entre 400 y 3800 dólares anuales en toda clase de seguros. Sunponga que el dinero que se gasta tiene una distribución uniforme.
price scanners at o-mart are supposed to produce no more than 2 errors. is this under-stated? we randomly sample n1000
To test the hypothesis that 48% of PC users have never used a Mac, the analyst took a sample of 50 PC customers drawn at random and found that 22 of them had never used a Mac.
By using the results in (a), construct a boxplot. Indicate clearly on the boxplot the five-number summary. Are the data skewed? If so, describe its skewness.
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