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Question: To investigate whether standing up while studying affects performance in an algebra class, a teacher assigns half of the 30 students in his class to stand up while studying and assigns the other half to not stand up while studying. To determine who receives which treatment, the teacher identifies the two students who did best on the last exam and randomly assigns one to stand and one to not stand. The teacher does the same for the next two highest-scoring students and continues in this manner until each student is assigned a treatment. Which of the following best describes this plan?
(a) This is an observational study.
(b) This is an experiment with blocking.
(c) This is a completely randomized experiment.
(d) This is a stratified random sample.
(e) This is a cluster sample.
Suppose a cabinet is selected at random. What is the probability that the cabinet is defect free? What is the probability that cabinet has at most two defects
a. What ids the population? b. What is the sample? c. Is this a judgment sample of a probability sample?
What is the difference between the means of employees' length of experience with their managers and their decisions of staying or leaving their current job?
Does that indicate that changes in the concentration of carbon dioxide cause changes in the global temperature? Why or why not?
A sample of n=100 bulbs is prepared using the new filament. The average life for this sample is x¯ = 780 hours with s =15.
Among a sample of 25 participants, what is the minimum number of participants that must be altered to make the sample variance arbitrarily large?
Consider the vector X in Problem 5.7.1 and define the average to be Y = (X1 + X2 + X3)/3. What is the probability that Y > 4? In this problem, we extend the proof of Theorem 5.16 to the case when A is m × n with m X = 0.
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality? Explain.
The determinant coefficient (R2) and comment on the result. Predict the demand (y) when the budget for television advertising (x) equals 10.
Erika operates a website devoted to providing information and support for persons who are interested in organic gardening.- Determine the mean and the median for these data. Is there a mode? If so, what is its value?
in a group of 135 high school students 57 went to college. more precisely 30 of those who went to college were women
A brisk walk at 4 miles per hour burns an average of 320 calories per hour. If the standard deviation of the distribution is 7 calories, find the probability that a person who walks 1 hour at the rate of 4 miles per hour will burn the given number..
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