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1. A small college has 500 Freshmen, 400 Sophomores, 350 Juniors, and 300 Seniors. They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors. The overall sample isA. a stratified sample.B. a simple random sample.C. a multi-stage sample.
2. In a controversial election district, 73% of registered voters are Democrat. A random survey of 500 voters had 68% Democrats. Are the bold numbers parameters or statistics?A. Both are statistics.B. 73% is a parameter and 68% is a statistic.C. 73% is a statistic and 68% is a parameter.
3. Which sample size will give the least bias to a statistic?A. n = 100B. n = 500C. We don't know.
A study sponsored by American Express Co. and the French government tourist office found that old American stereotypes about French unfriendliness weren't true.
Use 0.01 significance level to test the claim that the selection process is biased against Mexican-Americans. What is the mean and standard deviation for the numbers of Mexican Americans?
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
Using α = .05, test to see whether the mean round-trip discount fare has increase in March. What is your conclusion? What is the p-value?
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Fully explain your answer.
Sample standard deviation s2 = 7.6 thousand dollars. Does this indicate that in St. Louis, computer stores tend to have higher mean profits per employee? Use α = 0.01 and interpret your answer.
A business owner decides to use a binomial distribution to solve one of his problems.
Illustrate your answer with a histogram of the sample's scores and sketches of the population distribution and the distribution of means, showing the t score and cutoff points for significance.
The State Department of education requires local school districts to keep records on all students within their district. Determine if the following items are categorical or numeric variables.
Henry performed a two-tailed test for an experiment in which N = 24. He could not find his table of t critical values, but he remembered the tcv at df = 13. He decided to complete his obt.with this tcv. Is he more likely to make a type I or II err..
problem 1if various samples of size 15 that is each sample consists of 15 items were taken from a large normal
She randomly samples 67 CFOs and finds that 40 of them get their money news from newspapers. Does the test show enough evidence to reject the findings of Robert Half International? Use a = .05.
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