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A teacher wants to know if students in her biology class did significantly better on an exam after instruction using authentic learning. The scores pre and post test are listed below. Based on an α = .05, what can the teacher conclude?
Pretest:77 79 81 88 67 90 73 82 85 76 71 70
Posttest:80 81 87 89 72 95 77 88 83 79 72 75
Laura wanted to build a multiple regression model based on advertising expenditures and Coffee Time's price index. Based on the selection of all normal values, she obtained the following:
Is the bottled water you're drinking really purified water? A four year study of bottled water brands conducted by the natural resources found that 25% if bottled water is just tap water. Consider a sample of five bottled water brands, and let x e..
A company has just manufactured 1694 CDs and 376 are defective. If 9 of these CDs are randomly selected for testing, what is the probablity that the entire batch will be accepted?
A wildlife biologist wants to do a test to see if there is a genetic trait linked to industrial toxins. Previous research says the trait is usually found in one out of every thirty frogs.
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
Share 1 real-world binomial distribution situation and 1 real-world Poisson distribution situation. Be sure to explain why each example is defined as binomial or Poisson.
Determine the p-value, and at 95% confidence, test the hypotheses.
Compute the range and interquartile range
In a batch of 8,000 clock radios 9% are defective. A sample of 15 clock radios is randomly selected without replacement from the 8,000 and tested.
Compute the coefficient of determination, r 2 , and interpret its meaning.
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
It is estimated that .44 percent of the callers to the customer service department of Dell Inc. Will receive a busy signal. What is the probability that of today's 1200 callers at least 5 will receive a busy signal? Use the poisson approximation t..
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