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At a college, two professors, Saber and Tooth, are each teaching large sections of introductory statistics with 500 students in each section. They decide to compare the results from their first exam. It would be too cumbersome to compare all 1000 students, so the decide to select a random sample of 50 students from each section. They want to find out whether or not the mean scores of students performance in these two sections is comparable for this one exam.
A) State the null hypothesis and alternative hypothesis. Indicate the type of test to be performed (left-tailed, right-tailed, or two tailed)
B) Provide a statement in terms of the hypothesis testing process in this problem that would signify a Type I Error has been committed.
C) Provide a statement in terms of the hypothesis testing process in this problem that would signify a Type II Error has been committed.
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
A sample of 60 students from a large university is taken. The average age in the sample was 22 years with a standard deviation of 6 years.
Findout the probability using normal approximation for the provided values. Findout the specified probability from a table of Normal probabilities.
M&M Milk Chocolate candies colors are not all the same proportion. Blue consist of 24% of the bag pieces while Brown & Red only 13% each. The following was found:
Does a regression model imply causation? Why or why not? Provide an example which provides and independent and dependent variable from your place of work.
The trend line y = 0.70 + 0.005t was calculated from quarterly data for 1999 -2003, where t = 1 for the first quarter of 1999. The seasonal indexes computed from the trend line for the four quarters of the year 2004 were .85, 1.05, 1.15, and .80, ..
Of the 250 students in a blind taste test, 150 (60%) preferred Milwaukee's Best over Natural Light. Then the 90% confidence interval for the student population proportion preferring Milwaukee's Best is:
Without constructing the 98% confidence interval for the rate of effectiveness, would you expect the interval to be longer or shorter compared to the 95% confidence interval? Why?
How do we decide if the homogeneity of variance assumption is significantly violated?
We want to know if his support has decreased. In computing a test of hypothesis with , what is the estimate of the overall proportion?
The Agency for Healthcare Research and Quality reports that medical errors are responsible for injury in 1 out of every 25 hospital patients in the United States. These errors are tragic and expensive. Preventable health care-related errors cost t..
A political strategist believes that less than 55% of voters in a certain state support a particular issue. He then commisions a poll of 500 voters and 54% of them support this issue. If = .05, is the political strategist's belief warranted?
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