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A researcher applies a random forest model to a very large set of genetic data to estimate the risk of getting throat cancer. The researcher would like to use 10-fold cross validation to estimate the test error of the random forest model. Suggest a more computationally efficient way of estimating the test error.
Fifteen randomly chosen teenagers were asked how many hours per week they spend on the phone. The sample mean was 4.75 hours with a sample standard deviation of 2.0. Conduct a hypothesis test. The null and alternative hypotheses are:
The response of the GSS question in 2006 about the number of hours daily spent watching TV, the responses by the seven subjects who identified themselves as Hindus were 2,3,2,1,0,1,4,3. find a point estimate of the population mean for Hindus. The ..
A random sample of 100 people reveals that the sample average is 3.2 and the sample standard deviation is 2.1. Construct a 95% confidence interval for the population average.
For the research scenarios in parts (a) and (b), explain whether a randomized experiment could be used.- To study the relationship between long-term practice of meditation and blood pressure.
The probability that the pro shop sells 36 dozen balls is 0.59; otherwise, the pro shop sells 21 dozen balls. What is the standard deviation of the number of balls the pro shop sells in a month? (please round your answer to 2 decimal places)
Solve the equation for x (by taking the logarithms of both sides): All the other exercises have x on the same side (left) so this one has thrown me.
When might someone prefer mode over mean or median to describe a data set's central tendency? When is the median preferred over the mean to describe a variable?
Suppose the officials in the city or town where you live would like to ask questions of a "representative sample" of the adult population.
Change both the quality and the quantity of the following statements:- Some corporate lawyers are not people with a social conscience.
A director of a social agency is planning to hire temporaty staff to assist with intake. In making plans, the director needs to know whether there is any difference in the use of he agency at different seasons of the year.
Calculate the 95% confidence interval for the proportion of students with at least one injury for each of the two subpopulation
Consider a gambler who on each bet either wins 1 with probability 18/38 or loses 1 with probability 20/38. (These are the probabilities if the bet is that a roulette wheel will land on a speci?ed color.) The gambler will quit either when he or she..
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