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Learning biology with computers An educator wants to compare the effectiveness of computer software for teaching biology with that of a textbook presentation. She gives a biology pretest to each of a group of high school juniors, then randomly divides them into two groups. One group uses the computer, and the other studies the text. At the end of the year, she tests all the students again and compares the increase in biology test scores in the two groups. Is this an observational study or an experiment? Justify your answer.
Discuss the general model for managing resistance. How does force-field analysis contribute to a successful change process?
Treat this as though it were a random sample, and test whether there are differences in the proportion of men and the proportion of women who smile.
Is Artificial Intelligence (AI) real intelligence? Can a computer learn and replace human thinking? AI can be grouped into three areas.
The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What is the probability that a pregnancy lasts at least 300 days?
What is the competitive equilibrium price per ride? What is the equilibrium number of rides per day? What is the minimum number of taxi cabs in equilibrium?
You randomly select 40 cans and carefully measure the contents. The sample mean of the cans is 127.9 ounces. Does the machine need to be reset? Explain your reasoning.
A resistant statistic is a numerical summary of the data that is "resistant" to the influence of outliers.
during a recent year the average cost of making a movie was 54.8 million. this year a random sample of 15 recent action
What are quartiles and percentiles? How can we use these concepts in the real world?
the dice game craps is played as follows. the player throws two dice and if the sum is seven or eleven then she wins.
a sample of 200 rates of return on real estate investments was computed and recorded. the sample mean is calculated to
Your client is being sued. You have asked the client's lawyer about the possibility of losing the lawsuit. The client, meanwhile, has asked you to describe what would happen to his or her financial statements.
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