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We wish to measure the average prevalence of a chemical in the population. The measurement is done by a blood test. We expect the standard deviation in the population to be about 300ppm. If we want to know the average to within 200ppm with a confidence of 95%, how many people do we need to test?
At the 0.05 level ofsignificance, is there evidence of a significant relationship between the agegroup and where people primarily get their news? If so, explain the relationship.
Which combination of factors has greatest likelihood of rejecting null hypothesis?
Which represent errors of estimation for individual points, an alternative way to examine the error of the regression model using a single measurement is to determine the sum of all the residuals.
A company buys 100 lightbulbs, each of which has an exponential lifetime of 1000 hours. What is the expected time for the first of these bulbs to burn out?
Interview a small business owner concerning the strengths and weaknesses of his or her business's location. Prepare a brief report summarizing your findings.
recall that benfords law claims that numbers chosen from very large data files tend to have 1 as the first nonzero
a shipment of assorted nuts is labeled as 45 walnuts 20 hazelnuts 20 almonds and 15 pistachios by count. a random scoop
the number of customers at quiet morning bakery is believed to follow a poisson distribution with a mean of 2 customers
guests arrive at random at a party and the host seats them as they arrive successively one at a time around a large
Using least squares regression, assuming homoscedasticity, test the hypothesis of a zero slope using the R function ols. Test this hypothesis again, only now do not assumed homoscedasticity; use the function olshc4.
a poll was conducted and showed that of those americans who said music plays a very important role in their lives 35
Forty percent of the sample wanted more local news. What is the 99% confidence interval for the proportion of readers who would like more coverage of local news?
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