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Question: The College Board, administrator of the SAT test for college entrants, has made several changes to the test in recent years. One recent change occurred between years 2005 and 2006. In a press release, the College Board announced SAT scores for students in the class of 2005, the last class to take the former version of the SAT featuring math and verbal sections. The board indicated that for the class of 2005, the average SAT math scores continued their strong upward trend, increasing from 518 in 2004 to 520 in 2005, 14 points above 10 years previous and an all-time high. The file titled Math SAT contains the math SAT scores for the interval 1967 to 2005.
a. Produce a scatter plot of the average SAT math scores versus the year the test was taken for all students (male and female) during the last 10 years (1996-2005).
b. Construct a regression equation to predict the average math scores with the year as the predictor.
c. Use regression to determine if the College Board's assertion concerning the improvement in SAT average math test scores over the last 10 years is overly optimistic.
assume that the heights of women are normally distributed with mean of 63.6 inches and a standard deviation of 2.5
Average cost of $3,200 for products. n=25. After review it seems mean cost is $2,000 with a standard deviation of $150. Test that average cost is $3,200 or more versus $2,000. assume level of significance of .05.
ind a 95% confidence interval for the proportion of all prospective customers who are PC-savvy. - Find a similar interval for the proportion who are PC-illiterate.
suppose it has been observed that touchdowns scored in a game by your favorite football team are poisson random
Suppose another 2 of the 12 will ask to be placed on the do-not-call list when contacted. What is the probability that these 2 people will not be called?
A role as a statistical consultant. You are the statistical expert for a graduate student planning her PhD research.- Explain in simple terms why this would not be a good use of statistical methods.
Find the probability mass function for the random variable.- What is the probability that the experiment proceeds for at least 4 rolls?
You have some estimates of national accounts numbers for a closed economy for the coming year. Under one set of expectations, government purchases will be $30 billion, transfer payments will be $10 billion, and taxes will be $45 billion.
The average monthly cot for a studio apartment in NYC is reported to be $1,000. You want to prove that average monthly rent is not what is stated.
Here are the DMS odor thresholds for 10 untrained students:
a major u.s. tire maker wants to review its warranty for their rainmaker tire. the warranty covers at most 40000 miles.
Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. Find the probability that a randomly selected TV will have a replacement time less than 5 years.
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