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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.
fuel tank capacity. consumer reports provides informa- tion on new automobile models-including price mileage rat- ings
Desribe the importance of quadratic equations to a basketball player, a diver, or even a sniper. Give an example of a real world situtation where you would apply quadratic equations.
A window frame that seems rectangular has height 408 cm, length 306 cm, and one diagonal with length 525 cm. Is the window frame really rectangular? Explain please.
Objective questions on regression
Use the formula S = R - D • R, where S is the sale price, R is the regular price, and D is the discount rate. During a clearance sale, all items are dis¬counted 30%. Find the regular price of a compact disk player on sale for $112.
What is the most expensive house Elwood
Explain why the survey question might lead to an erroneous conclusion. "Do you think that it is not important to give extra tutoring to students who are not failing?
Let E be a metric space, S a subset of E, and let f:E-R be the function which takes the value 1 at each point of S and 0 at each point of the complement of S. Prove that the set of points of E at which f is not continuous is precisely the boundary..
In a standard deck of cards, what is the smallest number of cards you must draw to guarantee that you have at least one pair?
at what time between 5pm and midnight are the most people listening to the station? what percentage of the population is listening at this time?
A poll of 64 students found that 30% were in favor of raising tution to build a new math building. The standard deviation of this poll is 5%. What would be the standard deviation if the sample size were increased from 64 to 190?
How much will the company owe on the equipment if they buy it after 15 months?
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