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Examine some coin-tossing trials. Use the Probability applet to generate 25 tosses of a fair (set the probability of heads to 0.5) coin. Record the sample proportion (this number appears in the upper-left part of the display). Using the "Reset" button, repeat until you have 30 trials, each with 25 tosses.
(a) Open the One-Variable Statistical Calculator applet and enter the sample proportions for your 30 trials. Summarize the data using the information provided in the applet.
(b) Count the number of times the sample proportion is above 0.5. How does this number compare with what you would expect? Explain your answer.
What is meant by the problem of direction of cause and effect and the third-variable problem?- How do direct experimental control and randomization influence the possible effects of extraneous variables?
A researcher claims that the average age of people who buy lottery tickets is 64. A sample of 30 is selected and their ages are recorded as shown below.
A cereal manufacturer seeks to test their newest product against a competitor's. A group of 100 children was asked to evaluate each brand, and then to express a preference. To guard against bias, neither the children, nor the technicians serving t..
Find the population standard deviation using the formula containing the mean (the original formula).
The following table gives the scores obtained by the students in a midterm test (X) and the final (Y). We want to see how well the final score
a student wants to assess whether her dog muffin tends to chase her blue ball more often than she chases her red ball.
Case study on Page 635-636 of the text BOOK: (Anderson, Sweeney, Williams, Essentials of Modern Business Statistics w/ Microsoft Excel, 5th ed., South-Western College Pub, ISBN 978-0840062383 )Alumni Giving.
Write down the null and alternate hypotheses. Formulate and test the appropriate hypotheses. Use the critical value approach. Assume that the population of paired differences has a normal distribution.
Explain how the picture below helps us understand Christianity. Who were the thinkers that used these philosophers to understand their faith?
What were the key events that marked the move toward American Independence?
If an overrun contract was bid at 12 million dollars, what does the least-squares line predict for the cost of overrun (as a percent of bid price)?
a manufacturer claims that its televisions have an average lifetime of at least five years 60 months with a population
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