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I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
At the 0.05 level of significance, is there evidence to suggest that the population mean waiting time to check out is less than 10.73 minutes?
Find out: The slack on all activities. The critical activities. The critical path.
At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule.
Your younger brother comes home one day after taking a science test. He says that someone at school told him that "60% of the students in the class scored above the median test grade." What is wrong with this statement? What if he said "60% of the..
Temperature in a certain city for the month of June follows a uniform distribution over the interval 61º F to 91º F. What is the probability that a randomly selected June day has a temperature that exceeds 70º F?
Research question: Are the mean crash damages the same for these three vehicles?
If we want to estimate the populations mean travel-to-work time San Francisco residents with a margin of error of 1 minute, what sample size should be used? Assume 95 percent confidence.
Now he wants to know if there is a difference between the three formats. Is there?
The significance level of a statistical test is equal to the probability that the null hypothesis is true.
Based on your analysis, how is the new bottling process working?
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
Find the probability that at least one subject experiences headaches. Is it unusual to have at least one of six subjects experience headaches?
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