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9.2 The dean of a graduate school wishes to predict the grade point average in graduate work for recent applicants. List a dozen variables that might be useful explanatory variables here. 9.4 In forward stepwise regression. what advantage is there in using a relatively small α-to-enter value for adding variables? What advantage is there in using a larger α-to-enter value? 9.7 An engineer has stated: "Reduction or the number of explanatory variables should always be done using the objective forward stepwise regression procedure." Discuss. 9.8 An attendee at a regression modeling short course stated: "I rarely see validation or regression models mentioned in published papers. so it must really not be an important component of model building." Comment.
a) Explain why ground-wave propagation is more effective over sea water than dessert terrain. b) Why do stations in the AM broadcast band always use vertically polarized antennas
A Russian SVR agent has 45 million dollars which he can spend to bribe academics, politicians, and bloggers to spread disinformation and to promote anti-American propaganda
Beanie Babies are toy stuffed animals that have become valuable collector's items. Beanie World Magazine provided the information on 50 Beanie Babies given in beanie.xls.
forecasting with time series analysis objective crusty pizza executives have to forecast december sales for the 10
How many categories in the ACME transportation table are qualitative and what is the average number of merchandise per order, for all orders? Round to the nearest integer and what is the standard deviation of all orders in this sample?
Determine whether this data already provides an expected relative error introduced by the simulation of below 5%. If not, compute how many new simulations you should run in order to reduce the expected relative error introduced by the simulation b..
Calculate the correlation between pretest and posttest scores separately for each gruop and determine sperately for each group whether performance improved from pretest to posttest
Develop 95% confidence intervals for the proportion of all students, the proportion of male students, and the proportion of female students who were involved in some type of cheating.
For the daily lottery game in Illinois, participants select three numbers between 0 and 9. A number cannot be selected more than once, so a winning ticket could be, say, 307 but not 337. Purchasing one ticket allows you to select one set of num..
Define the hypothesis and find the standard error of the difference in the means also find the test statistic - Determine the required sample size to be able to use a 99% confidence interval.
EIHP Assessment 2 – Interpreting Basic Statistical Data, Article: Ramirez, G. & Beilock, S.L. (2011). Writing about testing worries boosts exam performance in the classroom. Science, 331. 211-213. This article is page 74-77 of your handbook.
1. if the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2 hours
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