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We would like to estimate the true average age of customers for a particular company. How large would the sample size need to be for the margin of error (based on 95% confidence) to be 1 year? Suppose that, based on previous research, we can assume the standard deviation of customer ages will be 14.
a researcher selects a sample of 80 people and records the frequency of participants choosing a low moderate or high
find the unexplained variation for the paired data. the paired data below consists of test scores and hours of
Two researchers are testing the null hypothesis that a population proportion p is .25 and the alternative hypothesis that p > .25. Both take a sample of 100.
here are the golf scores of 12 members of a college womens golf team in two rounds of tournament play. a golf score is
If her AGI is $63,000, how much IRA contribution can she deduct for tax purpose?
Give a 95% confidence interval for the average caloric content of a 3-ounce cut of top loin steak. Also give a 98% confidence interval for the average caloric content of a cut.
On the average, how many student-days elapse between injuries to fourth to sixth graders in unorganized activities at school, and what is the probability that the next such injury will occur before 45 thousand student-days have passed?
What percentage of the workers is paying between $1800 and $2400 per year toward the family health coverage premium? What is the probability that a worker pays more than $2500 towards the family health coverage premium?
An advertisement is being tested to see if it is effective in creating the intended mood of relaxation. A sample of 15 people was tested just before.
a. What is the independent variable in this example? b. What is the dependent variable?
Keep a diary of your purchases for two weeks. Select five or more of the products you purchased during that period
What factors have contributed to the success of intermodal rail service? What barriers exist to future expansion?
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