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Suppose that you are asked to conduct a study to determine whether smaller class sizes lead to improved student performance of fourth graders. Further suppose that you can collect observational data on several thousand fourth graders in a given state. You can obtain the size of their fourth-grade class and a standardized test score taken at the end of fourth grade. Why might you expect a negative correlation between class size and test score? And would this negative correlation necessarily show that smaller class sizes cause better performance?
a pair of fair six-sided dice are tossed independently of each other.a list the sample space of this experiment.b
suppose we have a floor made of parallel strips of wood each with width 3 and we drop a needle of length 1 onto the
Amanda has 400 feet of lumber to frame a rectangular patio. She wants to maximize the area of her patio. What should the dimensions of the patio be
a population has a mean of 300 and a standard deviation of 24. a simple random sample of 144 observations will be
in a game of chance a number of draws are made with replacement from a box of tickets 500 of these tickets are labeled
q1 a researcher claims that the standard deviation of the ages of cats is smaller than that for dogs. a random
the lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15
in an integrative research review of an intervention s effectiveness which statement is true of an inclusion statement
according to some research males have better spatial skills than do females and according to other research females
a machine is set to pump water into a pool at the rate of 10 gallons per minute. upon inspection it is learned that
Mmen will have a heart attack in the next 5 years. How large a sample would we need to have an 80% chance of finding a significant difference if the true rate of heart disease in this group is 13%?
insurance for an appliance costs 30 and will pay 330 if the insured item breaks within 2 years. the insurance company
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