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Two data scientists are discussing a strategy to select a subset of predictors for a model with n = 5,000 observations and p = 400 predictors. The ?rst suggests that they perform a forward stepwise selection procedure starting with a null model. Of these resulting models, they would ?nally choose the one with the smallest RSS. The second objects, saying that forward stepwise selection is a greedy algorithm and is unlikely to ?nd the true optimal model. Therefore, they should instead use a best subset algorithm. Do you agree with either of the data scientists? Explain your answer.
we have b 18 times 109 bits that need to be sent over a channel which has a constant but random rate r bitssecond with
30% of college freshmen support increased military spending. If 12 college freshmen are randomly selected, find the probability that more than 5 selected students support increased military spending.
According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of major surgery patients are dissatisfied with after-surgery care in the hospital. A scientific poll based on 400 hospital patients has ju..
Make the plot such that if the outlier were removed, the correlation for the remaining points would be greater than r = 0.7.
At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
What did they do? For the following reports about statistical studies, identify the following items (if possible).
What kind of sampling have you done (simple random sampling, stratified sampling, systematic sampling or cluster sampling)?
Suppose the sample variance for 3 parts turns out to be S2 = .0005. Use a=.05 to test whether the population variance specification is being violated.
a survey of 36 randomly selected iphone owners showed that the purchase price has a mean of 392 with a sample standard
This problem relates to Basic Statistics and it is about calculate the mean, median and mode for the given data
On each turn, you will roll two dice. To win, you must roll a total of 3 or roll a 3 on one of the dice. How many turns might you expect this to take?
If the salaries are normally distributed with a standard deviation of $5000 (s = 5000), find the probability that:
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