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Scatter plot and correlation.
Costs of Televisions Listed below are prices (in dollars) and quality rating scores of rare-projection televisions (based on data from Consumer Reports). All of the televisions have screen sizes of 55 in or 56 in. Is there sufficient evidence to conclude that there is a linear correlation between the price and the quality rating score of rare-projection televisions? Does it appear that as the price increase, quality score also increases? Do the results suggest that as you pay more, you get better quality?
Price 2300 1800 2500 2700 2000 1700 1500 2700
Quality Score 74 73 70 66 63 62 52 68
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
A professor of math refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim?
A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
How much evidence is there that the mean composite satisfaction rating exceeds 42?
200 people were surveyed and asked to rate mayor Michael Bloombergs effectiveness towards education. The rate scale is 1 (lowest) to 10 (highest). Mayor Bloomberg's average rating was 7.50, with a standard deviation of 2
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
A study published in the New England Journal of Medicine (Aug. 2001) suggests that it's dangerous to enter a hospital on a weekend. During a 10-year period, researchers tracked over 4 million emergency admissions to hospitals in Ontario, Canada. T..
Compute an F-statistic for each linear construct and determine its significance. Also, state what questions each of these contrasts address.
The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test.
Create a set of n observations from the binomial distribution with 1 trial and the event probability of 0.007, where n is your answer.
The student body of a large university comprises 60% female students. Elucidate what is the probability that the students in the sample exactly two are female?
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