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Public Agenda conducted a survey of 1379 parents and 1342 students in grades 6-12 regarding the importance of science and mathematics in the school curriculum (Associated Press, February 15, 2006). It was reported that 50% of students thought that understanding science and having strong math skills are essential for them to succeed in life after school, whereas 62% of the parents thought it was crucial for today's students to learn science and higher-level math. The two samples-parents and students- were selected independently of one another. Is there sufficient evidence to conclude that the proportion of parents who regard science and mathematics as crucial is different from the corresponding proportion for students in grades 6-12? Test the relevant hypotheses using a significance level of .05.
Suppose a population proportion is .40, and 80% of the time when you draw a random sample from this population you get a sample proportion of .35 or more. How large a sample were you taking?
What is the probability of finding a sheet chosen at random which contains 3 or more surface flaws and find the greatest standard deviation,
A random sample of the percentage used space for companies is 38, 18, 91, 37, 55, 80, 71, 92, 68, 78, 40, 36, 50, 45, 22, 19, 62, 70, 82, 25. Conduct the test using α = 0.05.
The First City Real Estate Company lists and sells residential real estate property in and around Yuma, Arizona.
The trail was repeated 54 times with 22 correct identifications and 32 wrong identification.
in a simple random sample of 80 automobiles registered in jland 28 of them were found to have emission levels that
What information is presented in a contingency table in the chi-square test for independence?
A powder diet is tested on 49 people, and a liquid diet is tested on 36 different people. Of interest is whether the liquid diet yields a higher mean weight.
the 92 million of americans of age 50 and over control 50 percent of all discretionary income aarp bulletin march 2008.
If five cars are selected at random to be placed on a special sale, what is the probability that three are Fords and two are GMs?
Suppose you have a choice of two grocery stores in your neighborhood. Because you hate waiting, you want to choose the one for which there is generally.
A study is made by an auto insurance company to determine if there is a relationship between the driver's age and the number of automobile accident claims submitted during a one-year period. From a sample of 300 claims, the following information w..
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