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1. 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.
Let C(q) be the cost, and R(q) be the revenue of producing q items. If C′(23) =62 and R′(23) =57 then approximately how much profit is earned by item number 24?
mels furniture received an invoice dated september 27 for five bedroom sets at 3000 each. the invoice indicated a
Determine the maximum and minimum values for the following set.
Prove that varphi is an automorphism of F[x] such that varphi(a) = a for every a in F.
A regular hexagon is inscribed in a circle with a radius of 10 meters. What is the length of each side of the hexagon?
a machine at a casino returns money to the player on 20 of plays. a player makes plays on the machine repeatedly hoping
A cylindrical drill with radius r1 is used to bore a hole through the center of a sphere of radius r2. Find the volume of the ring-shaped solid that remains.
the gestation period of gray squirrels in captivity is listed as 44 days. it is recognized that the potential life span
U.C.L.A. states that at least 40% of the students live on campus. From a sample of 250 students, 90 live on campus. Does this sample provide evidence that fewer than 40% live on campus? Conduct the test with a=0.01.
your management team believes they have identified a resource allocation problem within the manufacturing department.
Pauline takes a loan of S dollars at an interest rate of r percent per month, compounded monthly. She plans to repay the loan in T equal monthly installments of P dollars each.
Determine forecasts value
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