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The scores on the certain test are "normally distributed with mean 61" and "standard deviation 3". Determine the probability that the sample of 100 students will have the mean score of at least 61.3?
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a test of sample means or sample proporti..
Pollsters attempt to find out whether or not person is a "likely voter" before they count their opinion in poll. If we suppose 40% of registered voters will really vote.
The probability of obtaining a random sample mean, which is lower than the population mean, is:
Find the sample correlation between returns on assets and the ratio of loans to deposits. Interpret the intercept and slope of the estimated regression line.
When performing a chi-square test for independence, explain how the "cell frequencies under the independence assumption" are calculated.
An aptitude test is designed to measure leadership abilities of the test subjects. Suppose that the scores on the test are normally distributed with a mean of 580 and a standard deviation of 120.
The Food King Chain employs more than 3,000 people. The worker's ages are approximately normally distributed, with a mean of 31 years and a standard deviation of 4.3 years.
Determine the p-value; and at 95% confidence, test the above hypotheses.
Visits to Web sites. What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take first place, but about 50 percent of male Internet users in this age group visit an auction site such as eBay at least once a month. Inte..
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
The average hourly wage last year for members of the hospital clerical staff in a large city was $6.32. The standard deviation of the population was $.54. This year a sample of 50 workers had an average hourly wage of $6.51. Test the claim at alph..
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