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Using the data provided, x = the quality of the speed of execution and y = overall satisfaction with the electronic trades provided the estimated regression equation ? = .2046 + .9077x. At the 0.05 level of significance, test whether the speed of execution and overall satisfaction are related. Show the ANOVA table. What is your conclusion?
Brokerage
Speed
Satisfaction
Scottrade, Inc.
3.4
3.5
Charles Schwab
3.3
Fidelity Brokerage Services
3.9
TD Ameritrade
3.6
3.7
E*Trade Financial
3.2
2.9
Vanguard Brokerage Services
3.8
2.8
USAA Brokerage Services
Thinkorswim
2.6
Wells Fargo Investments
2.7
2.3
Interactive Brokers
4.0
Zecco.com
2.5
Form the cumulative percentage distribution and plan a cumulative percentage polygon.
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Fully explain your answer.
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
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Calculate the population mean and population standard deviation.
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Suppose you were preparing two-way tables of percentages for the following pairs of variables. How would you run the percentages?
What would be the most appropriate graphical representation to show the dispersion of new home prices in a particular area? Why?
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