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Professor Friedman's economics course the correlation between the students' total scores prior to the final examination and their final-examination scores is r = 0.61. The pre-exam totals for all students in the course have mean 270 and standard deviation 29. The final-exam scores have mean 73 and standard deviation 9. Professor Friedman has lost Julie's final exam but knows that her total before the exam was 295. He decides to predict her final-exam score from her pre-exam total.(a) What is the slope of the least-squares regression line of final-exam scores on pre-exam total scores in this course? (Use 2 decimal places.)
Test either there is any difference among the given variable also what does the Levene's Test shows. What variable is presented in this table.
Studies from a local mall show the typical shopper spends 0.75 hrs shopping. the standard deviation is 0.10 hours. A sample of 45 shoppers revealed the mean time spent increased to .080.
Is there sufficient evidence for one to claim that in general, rugby players have a higher BMI than the multisport men? Perform the test at the 0.01 level of significance.
Use a scatter plot to determine the relationship between the x values and the y values.
Given the following data, create a scatter diagram (using Excel), click on the points as demonstrated in the Excel workbook, and have Excel place the regression equation and coefficient of correlation on the graph for you. Interpret the results (i..
The chi-square goodness of fit is______________a one-tailed test with the rejection region in the right tail.
Specify the null and alternative hypotheses you would use to determine if the opinions of Internet users are evenly divided among the four categories.
Assume that the height of adult caucasian women have a mean of 63.6 inches and a standard deviation of 2.5 inches. If 100 women are randomly selected find the probability that they have a mean height greater that 63.0 inches.
Let p1 = 100 and n1 = 500; and p2 = 200 with n2 = 500. Test whether there is a statistical difference between the two proportions at the 5% significance level.
The publisher of Celebrity Living claims that the mean sales for personality magazines that feature people such as Angelina Jolie or Paris Hilton are 1.5 million copies per week.
A minority representation group accuses a major bank of racial discrimination in its recent hires for financial analysts. Exactly 10% of all applications were from minority members, and exactly 8% of the 900 open positions were filled by members o..
Do these data provide sufficient evidence to indicate that the mean for the population is less than 8 hours? assume a normally distributed population.
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