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100 * (1-p) is how confident we are the treatment groups actually differ. Example p=0.02 indicates we are 98% sure that the differences we observed in our experiment were caused by the treatments. What does p=0.6 indicate? The treatments probably made no difference. Let"s redesign the Steak experiment so that in addition to 4 packaging methods, we have two storage temperatures -- Low, High. We have 16 steaks available. How do we randomly assign them?
A firm will promote two employees out of a group of six men and three women. list the chances of this experiment if there is particular concern about gender equity.
In a sample of 60 mice, a biologist found that 46% were able to run a maze in 30 seconds or less. Find the 99% limit for the population proportion of mice who can run that maze in 30 seconds or less?
A research firm conducted a survey to determine the mean amount people spend at a popular coffee shop during a week. They found the amounts spent per week followed a normal distribution with a population standard deviation of $4.
A study of 20 worldwide financial institutions shows the correlation between their assets and pretax profit to be .86. At the .05 significant levels, can we conclude that there is positive correlation in the population?
How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 99% confidence?
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that none of the men will say yes?
Find out best decision, by using following decision criteria.
At the 0.01 level, is the bank loan financially sound (should the bank ask for additional collateral)? What is the decision rule?
What is the value of the population mean? What is the best estimate of this value?
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year.
What minimum sample size will be required if they want to be 99% confident that the sample proportion will not differ from the true population proportion by more than 5%?
Describe the steps for testing a hypothesis that people are more likely to keep watching a movie if they have already invested money to obtain the movie.
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