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The herb gingkgo biloba is commonly used as a treatment to prevent demnetia. In a study of the effectiveness of this treatment 1545 elderly subjects were given ginkgo and 1524 elderly subjects were given a placebo. Among those in teh gingkgo treatment group 246 later developed dementia and among those in the placebo gropu 277 later developed dementia and among those in teh placebo 277 later deveoped dementia. We want to use 0.01 significance level to test the claim that the gingko is effective in preventing dementia.
A. Test the claim using a hypothesis test.
b. Test the claim by constructing an appropriate confidence interval.
c. Based on teh reslits is ginkgo effective in preventing dementia?
for each of the following scenarios indicate which type of statistical error could have been made and where additional
You are estimating the install hours for an electronics upgrade based on the number of components affected. The upgrade for which you are estimating affects 25 components. Given the following equation, select the correct response from each pair.
a study of mba graduates revealed that they have several expectations of prospective employers beyond their base pay.
Class was approximately normal with mean 530 and standard deviation 80. About what percent of students will score between 370 and 690?
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
A decision maker is working on a problem that requires her to study the uncertainty surrounding the payoff of an investment. There are three possible levels of payoff -$1,000, $5,000, and $10,000.
Name six virtues and characteristics of problems and hypothesis. Name some tips for identifying and developing formal research problems.
Among 134 randomly selected students, 9.3% refused to respond on a survey on cheating while among 154 male college students, 14.6% refused to respond to the same survey. Determine test statistic, critical values, p-value, and conclusion.
wisconsin is an important milk-producing state. some people might argue that because of transportation costs the cost
In past elections, the representative received 40 percent of the popular vote in that area of the state. She doubts whether it has changed much. How many registered voters should be sampled?
A company has 25 cars of this model. What is the probability that the mean nitrogen oxide emissions of these cars is above the 0.3g/mi limit?
a player tosses two coins. if two heads show he wins 4. if one head shows he wins 2 but if two tails show he must pay a
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