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Eleanor scores 680 on the mathematics part of the SAT. The distribution of SAT math scores in 2007was Normal with mean 515 and standard deviation 114. Gerald takes the ACT Assessment mathematics test and scores 27. ACT math scores for 2007 were Normally distributed with mean 21.0 and standard deviation 5.1.
What is Eleanor's standardized score? Round your answer to 2 decimal places.
What is Gerald's standardized score? Round your answer to 2 decimal places.
What is the p-value associated with the above sample result?
Internet users age 12-17 in proportion who opposes ads? Solve manually and then by mega stat. Point to your decision rule, your hypotheses and statistical and management conclusions."
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.
Gender differences in dream content are well documented (Winget & kramer, 1979). Suppose a researcher studies aggression content in the dreams of men and women.
For the following statement, write the null hypothesis and the alternative hypothesis. Also label which one is the claim.
Assume that customers enter a store at the rate of 60 persons per hour. a) what is the probability that during 5 minutes interval no one will enter the store?
A recent election return indicated that 55% voted for a proposal, 40% voted against it, and 5% abstained. What is the probability that a voter either abstained or voted against the proposal?
Will the sum of squared deviation scores be greater for the test or the exam (assume the same number of people sat both the test and the exam)? Why?
How large a sampl.e is needed to estimate the true proportion of home owners who have vegetable gardens to within 4 percentage points with 95% confidence?
Assume that the heights of adult white men have a mean of 67.9 inches and a standard deviation of 2.8 inches. If 64 men are randomly selected, find the probability that they have a mean height greater than 68.9 inches.
Construct a 90 percent confidence interval for the true mean weight. Describe factors which might cause variation in the weight of Tootsie Rolls during manufacture.
a random sample of 100 doctors was selected. Suppose you reject the null hypothesis. What conclusion can you draw?
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