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Financial advising
(a) Starting with the model in Table 4, add both Em- ployment and Annual Payroll to the model. Does adding this pair improve the fit of the model by a statistically significant amount?
(b) Instead of adding the pair as in (a), add the ratio Annual Payroll/Employment (average payroll salary). Does adding this ratio produce a statistically significant improvement?
(c) Explain your preference among the original model and these two models that add variables.
many people believe that unusual behavior is more likely to occur during a full moon. in fact they believe that twice
A teacher claims that the variance on a calculus test is 68. A sample of 28 students had a standard deviation of 5.8. Test the teacher's claim at the 0.05 level of significance.
you have learned some of the basic terminology of statistics. please propose a study and write a description of the
question a market research team compiled the following discrete probability distribution for families residing in
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
Using this he gives a cost estimate of $24,000 for a new order for 500 units. Is this a reasonable cost estimate? Explain why or why not. Looking at the data on file, can you give a better cost estimate?
What is the probability that a randomly selected student is either Caucasian or Black?
Find a lower bound for the probability P (|A20 - 50| ≤ 10), where A20 is the average of the distances from Hangtown at the time of breakdown.
13.1: Fitting a straight line to a set of data yields the following prediction line:
What do we mean by confidence intervals - provide an example that illustrates your answer. Suppose we were to apply 95% and 99% confidence to your study results.. how might your result differ and why?
testing for population mean.you conduct a survey of a sample of 25 members of this years graduating students and find
find and interpret the 98 confidence interval for the standard deviation of the time that it takes a telephone
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