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A pain-killing drug was tested for efficacy in 50 women who were experiencing uterine cramping pain following childbirth. Twenty-five of the women were randomly allocated to receive the drug, and the remaining remaining 25 received a placebo (inert substance). Capsules of drug or placebo were given before breakfast and again at noon. A pain relief score, based on hourly questioning throughout the day, was computed for each woman. The possible pain relief scores ranged from 0 (no relief) to 56 (complete relief for 8 hours). Summary results are shown in the table.
(a) Test for evidence of efficacy using a t test. Use a directional alternative and α = 0.05.
(b) If the alternative hypothesis were nondirectional, how would the answer to part (a) change?
A signal has a fundamental frequency of 1000 Hz. What is its period? Assume the signal has a peak amplitude of 1 Volt and that the instantaneous power is equal to the square of the voltage, then compute the average power of the fundamental frequen..
Design a circuit with output f and inputs x0,x1,y0 and y1. Let X = x0x1 be a number, where the four possible values of X, namely 00,01,10,11, represents the four numbers 0,1,2,3 respectively. The same thing with Y = y0y1.
Determine the minimum number of inverters, 2-input ANDs and ORs needed to implement each of the Boolean functions given below. If an inverter has delay of 1ns and each 2-input gate has a delay of 2ns
One of the ways to look at programming at the assembly-language level is to consider it as putting together code fragments that do various little jobs. (This is a little higher-level than just thinking of it as a sequence of machine instructions.)
Design the minimum-cost circuit and compare its cost with combined costs of two circuits that implement f and g separately. Assume that the input variables are available in both uncomplemented and complemented forms.
The function f(t)=3cos(500πt) + 5cos(800πt) issampled digitally at a sampling rate of 400 Hz, starting attime t = 0.00025 s. (a)Calculate the frequencies that you would expect to see on afrequency spectrum of the sampled data.
A constant current of 10 mA charges a capacitance of 50 µF that was initially charged to 22 V. How much time goes by before the capacitor's stored energy reaches 590 mJ
What is a SCADA system?And what are the component of SCADA system?
A 60-turn coil carries a current of 2A and lies in the plane x + 2y- 5z = 12 such that the magnetic moment m of the coil is directed away from the origin. Calculate m, assuming that the area of the coil is 8cm2.
If the output of a low-pass RC filter is 12 dB below its maximum at f = 1 kHz, then how far below the maximum will the output be when f = 10 kHz
The forces 20N,30N,40N,50N and 60N are acting on one of the angular points of a regular hexagon towards the other five angular points taken in order. Find the magnitude and direction of resultant force
A particular signal source produces an output of 30 mV when loaded by a 100-k ohm resistor and 10 mV when loaded by a 10-k ohm resistor. calculate the thevenin voltage, Norton current, and source resistance.
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