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Researchers asked a sample of 50 1st grade teachers and a sample of 50 12th grade teachers how much of their own money they spent on school supplies in the previous school year. They wanted to see if teachers at one grade level spend more than teachers at the other grade level.
a. What type of study is found-observational or randomized experiment? Explain.
b. What is the experimental or observational unit?
c. What is the response variable?
d. What is the explanatory variable?
e. Do we have to worry about confounding variables in this instance? Why? If so identify a possible confounding variable?
f. Are either of the terms retrospective study or prospective study relevant? Explain.
for multiple sclerosis patients we wish to estimate the mean age at which the disease was first diagnosed. we want a 90
A one compartment vertical file is to be constructed by bending the long side of an 8 inch by 20 inch sheet of plastic along two lines to form a U shape. How tall should the file be to maximize the volume that it can hold?
Find the empirical probability that an iris bulb of this type will bloom. Give answer as a fraction in lowest terms. How many of the bulbs should she plant next fall if she would like at least 52 to bloom?
State the domain of the following and provide a brief explanation fgor your answer: a) f(x)=sqrtx+4 b) g(x)= 2x+1/x-7 c) h(x)=3x^2+5x-3 d) l(x)=2x+3 e) m(x)=3/x^2+7
He has 790 feet of fencing available to complete the job. What is the largest possible total area of the four pens?
the base of a cylindrical water tank has an area of 28 feet. when the tank is full it hold 140 feet of water. what is the hight of the tank?
Finding the dimensions of a rectangle using second derivative test - Find length and width should the rectangle have so that its area is a maximum?
write an eqution of a line containing the given point parallel to the given line.express your answer in the form y=mxb.the equation
A salesman drives from Ajax to Barrington, a distance of 133 mi, at a steady speed. He then increases his speed by 15 mi/h to drive the 185 mi from Barrington to Collins. If the second leg of his trip took 15 min more time than the first leg, how ..
many solutions are there in nonnegative integers to the equation x1 +x2 + · · · + xm = r, where m and r are constants?
Consider the differential equation dy/dx = [3e^(-2t)][y^2-7y+10]. By considering the slope field for this differential equation, determine whether the equilibrium states are stable or unstable. Make your analysis clear.
computing the height of the building.nbspsolve the following application problem.a.a man at ground level measures the
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