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More on public university tuition. Refer to the previous exercise.
(a) Construct a 95% confidence interval for the slope. What does this interval tell you about the annual percent increase in tuition between 2000 and 2008?
(b) What percent of the variability in 2008 tuition is explained by a linear regression model using the 2000 tuition?
(c) The tuition at Stat U was $5100 in 2000. What is the predicted tuition in 2008?
(d) The tuition at Moneypit U was $8700 in 2000. What is the predicted tuition in 2008?
(e) Discuss the appropriateness of using the fitted equation to predict tuition for each of these universities.
low reliability of the variables reduces the correlation coefficient becausea. the deviation scores are less likely to
Compute the coefficient of correlation and the coefficient of determination and determine the regression equation.
Exercise and heart rate. A student project measured the increase in the heart rates of fellow students when they stepped up and down for three minutes to the beat of a metronome.
according to a website about salaries the national average salary as of october 2003 for a human resources clerk was
At the 0.025 level of significance, test whether customer size might be independent of estimation accuracy.
students of dr. psychicu2019s training class wanted to see if they do learn the skills at the end of the class. each
Switching banks after a merger. Banks that merge with others to form ‘mega-banks' sometimes leave customers dissatisfied with impersonal service.
One coin in a collection of 65 has two heads. The rest are fair. If a coin, chosen at random from the lot and then tossed, turns up heads 6 times in a row, what is the probability that it is the two-headed coin?
What is the variance of W in this case? Is it less than, greater than or equal to the variance in (a)? Explain why. For what values of c, if any, will the variance be equal to 0? Explain.
1.The demand for Carolina Industries product varies greatly from month to month. Based on the past two years of data, the following probability distribution shows the company's monthly demand:
Let X have a Poisson distribution with parameter lambda. Show that E(X)= lambda directly from the definition of expected value. [Hint: The first term in the sum equals 0, and then x can be canceled. Now factor out lambda and show that what is left..
Using the confidence interval method, test the claim that the average age of consumers is at least 30 years ( α= 0.05). Test the same claim by using the test statistics method ( Z or T test).
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