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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
Dunn Poitiac has compiled the following sales data regarding the number of cars sold over the past 60n selling days. Answer the following questions for the sales data shown.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
Probability using Z-score.Find the probabilities that a random variable Z having a standard normal distribution will take on a value.
At the 0.05 level of significance, can we conclude Middletown students remained in their districts less time than Brockton students? Make use of 5-step hypothesis testing procedure.
Solve problem graphically1. Describe optimal solution and objective function value in context of the problem.
Florida State University administers a mathematics placement test to students where they 1st enter the university.
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
The data below shows the time to process an inpatient admission, before and after a system usage training session was given. The following hypotheses were formulated for this study.
Find the margin of error for the 95% confidence interval used to estimate the population proportion.
For the past 20 years, the high temperature on April 15th has averaged (j = 62 degrees with a standard deviation of a = 8. Last year, the high temperature was 66 degrees.
Then estimate demand again with a weighted moving average in which sales in the most recent year are given a weight of 2 and sales in the other two years are each given a weight of 1.
Compute the probability of exactly 0,1,2,3,4, and 5 arrivals per day.
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