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The world's smallest mammal is the bumblebee bat. Shown to the right are weights(in grams) from a sample of those bats. Use the traditional method and significance level of .05 to test the claim that these bats come from the same population having a mean weight equal to 1.8 g.
The odds ratio between treatments (A, B) and outcome (death, survival) equals 2.0. What do you think about the following interpretation: "The probability of death with treatment A is twice that with treatment B". If you think, the above interpreta..
We considered Mary's interest in doing a study to see if learning of 6th graders on a math lesson is affected by background noise level. She was planning to use 2 noise conditions and then analyze her outcomes using a t-test for independent groups..
Testing equality of variances - evidence of a difference in the variability of monthly talking time on cell phones for men and women?
A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 95% confident that the sample mean is correct to within plus-or-minus $50 of the population mean.
Compare two models. Model #1 has an r-squared of .25 and an adjusted r-squared of .10. Model #2 has an r-squared of .20 and an adjusted r-squared of .14. Given this information, what model should you use?
Find the probability that in a given year,a) Exactly one major hurricane will strike the U.S. mainland
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
What is the probability that the mean life-span of a sample of 64 randomly selected bulbs will exceed 727 hours?
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
Determine the typical seasonal patterns for sales using the ratio-to-moving-average method. Project the sales for 2004, and then seasonally adjust each quarter.
We suspect that automobile insurance premiums (in dollars) may be steadily decreasing with the driver's driving experience (in years), so we choose a random sample of drivers who have similar automobile insurance coverage and collect data about th..
A manufacturer produces and sells chilled, ready-to-eat pasta salad in round lots of 50 serving units each. These items have a very limited shelf life; therefore, if items are made but not sold, they have no value.
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