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Sixty percent of all technical assistants would like to have a PC. Fifty percent of all technical assistants would like to have a MAC. Twenty percent of all technical assistants would like to have both. If a technical assistant is randomly selected, what is the probability that she would like to have MAC, given that she would like to have a PC as well?
Researchers at the Brigham & Women's Hospital recruited 2,000 participants to study the relation between diet and cholesterol.
The ANOVA table is given below,as well as a table of means and standard deviations for the three groups. Evaluate the t statistic for testing contrast
The controller of Dash Shoes Inc. instructs you to prepare a monthly cash budget for the next three months. You are presented with the following budget information:
A statistician wants to estimate the mean weekly family expenditure on clothes. He believes that the standard deviation of the weekly expenditure is $125.
Based on the information, what decision should the director make about the books used for the courses if the goal is to keep the cost below $300?
The samples do indicate that university A's students are younger than university B's; but is the difference significant at the 1% level?
Use the t test to determine whether the slope of the regression model is significant at α = 0.05.
In our discussions of basic probability theory the concepts of mutually exclusive events and independent events share prominent roles. Please explain these concepts and in particular address the question
Find out the expected shape of distribution of sample mean?
In a second grade class containing 12 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the probability that both are girls?
Tired of careless spelling and grammar, a company decides to administer a test to all job applicants. The test consists of 20 sentences. Applicants must state whether each sentence contains any grammar or spelling errors.
X is a random variable that represents ph of arterial plasma, the mean of the x distribution is 7.4. a random sample of 31 patients with arthritis took the drug for 3 months blood test
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