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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.
what is the union of sets x and y b. what is the intersection of sets x and y c. create your own set z that is a subset of x
part 1 develop your research question. what is it that you want to know? a good research question will tell the reader
Use Lagrange multipliers to find the given extremum. In each case assume that x and y are positive.
if the population of newport grows at a rate of 5% per year, how long will it take to double in size? use dy/dt=ky
A farmer had several pens out by the barn. He had used 17 lenghts of fence to make the pens, but now he needs to use six of those fence lengths for another project. He wants to remove six fence lenghts but still have two square pens remaing. Which..
a kite 100 feet above the ground moves horizontally at a speed of 8 feet per second. At what rate is the strong being let out when 200 feet of string has been let out.
Shane invests $38,000 in bonds that earn simple interest of 3%. The interest is payable at the maturity of the bonds after 5 years. Find the total amount that Shane will receive at the end of 5 years.
Graphing the trigonometric function.
worth, missouri is 25 miles more north of independence, missouri than it is west of putnam, missouri. The distance between independence and putnam is approximately 120 miles. Find the distance between putnam and worth and the distance between wort..
A car traveling at 42 ft/sec decelerates at a constant 62feet per second squared. How many feet does the car travel before coming to a complete stop?
Corporate bonds issued by Johnson Corporation currently yield 8%. Municipal bonds of equal risk currently yield 6%. At what tax rate would an investor be indifferent between these two bonds?
Which of the following indicates how many observations fall into various categories?
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