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A customer service representative was interested in comparing the average time (in minutes) customers are placed on hold when calling Southern California Edison and Southern California Gas companies. The representative obtained two independent random samples and calculated the following summary information: So Cal Edison
So Cal Edison So Cal Gas
Sample Size 9 12
Sample Mean 3.2 min 2.8 min
Sample Std Dv .5 min .7 min
Assume the distributions of time is on hold are approximately normal. Using the following null and alternative hypothesis
Ho:m1-m2 vs. Ha: mu1-mu2 not equal 0
Test Statistic is t=-1.455
Assume alpha is .1 what is the appropriate conclusion for this test?
a- reject Ho
b- do not reject Ho
c- reject Ha
d- none of these
A function y = f(x) whose graph in the xy-plane, when rotated around the x-axis
How long does it take for the baseball to reach its maximum? height? What is the maximum height obtained by the? baseball?
This procedure is used to break ties in games in the championship round of the World Cup soccer tournament.
A computer network consists of six computers. Each computer is directly connected to at least one of the other computers. Show that there are at least two computers in the network that are directly connected to the same number of other computers
A transformer is rated at 629 VA and has a primary voltage of 435 V and a secondary voltage of 133 V. Calculate the load factor (in %) that would result in maximum operating efficiency at unity power factor
The quotient of a number and 2 subtracted from 5
a plot of land is a trapezoid whose bases have lengths 80m and 110m and whose height is 50m. if a bag of seeds covers
If x is the number of trees and y is the average yield per tree find a linear equation that gives the yield y in terms of the number of trees, x.
Calculation that (a) interchanging the first and last rows changes the sign of detA and (b) interchanging the second and third columns changes the sign of detA.
A six-sided die is rolled and the number N on the upper face is recorded.
Let A be an n X n matrix, and suppose A has n real eigenvalues, ?1,,,,,,,,, ?n, repeated according to multiplicities.
Find the equation of the tangent line to the graph of the function f(x) = x + 3^-2x - 2sin(x) at the point with x-coordinate 0.
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