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Treatment for CLL Furman et al. (2014) reported on a study of patients with recurring chronic lymphocytic leukemia (CLL).
The study was randomized, double-blind, and placebo controlled. After 12 months, 101 of the 110 patients assigned to the combination treatment of idelalisib (idel) with rituximab (rit) were still alive, and 88 of the 110 patients assigned to placebo with rit were still alive.
Perform a hypothesis test to test whether those who take idel have a better chance of surviving than those taking the placebo.
Use a level of significance of 0.05. Can we conclude that idel causes an increased chance of survival? See page 424 for guidance.
a company manufactures 13 types of cars. prior to full-scale production 4 of each type are made and a sample of 5 cars
Measurements follow of the amount of HIV-1 RNA levels in the group whose partners who were initially uninfected became HIV positive during the course of the study: values are given in units of RNA copies/mL. Determine the mean, median, and standard..
a certain species of tree has an average life span of 130 ears. a researcher has notice a large number of trees of this
Calculate the mean and standard deviation for this set of data. Convert your answer back to dollars and cents and give the correlation value between number of beers consumed and BAC?
Do you think they should include studies that did not find statistically significant results when they do their meta-analyses? Why or why not?
Voters. Suppose that in your city 37% of the voters are registered as Democrats, 29% as Republicans, and 11% as members of other parties.
Now that you are an adult, you decide to test one of the truisms passed along by your mother: "Cheaters never win in the end." You randomly assign a group of 20 children to either cheat or to play fair on a scavenger hunt.
Inventories represent a considerable investment for every organization; thus, it is important that they be managed well. Excess inventories can indicate poor financial and operational management.
The average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule. (b) Is this a close decision?
The structure of a two factor study can be presented as a matrix with levels of one factor determining the rows and the levels of the second factor determining the columns. With this structure in mind, describe the mean differences that are evalua..
Use statistical inference to determine whether, on average, one mode of investment is better than the other.
A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below.
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