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The z distribution and statistics test scores: Imagine that your statistics professor lost all records lost all records of students' raw scores on a recent test. However, she did record students' z scores for the test, as well as the class average of 41 out of 50points and the standard deviation of points. She informs you that your z score was 1.10.
State appropriate null and alternative hypotheses. Since we believe a priori that water pollution should increase (rather than decrease) the rate of birth defects, use a one-sided alternative hypothesis
Check that the function: f(x1, x2, x3) = (x1)^2 + (x2)^2 + (x3)^2 - x1 - x2 - x3 is convex. Find the extreme values of f under the conditions:
six individuals including a and b take seats around a circular table in a completely random fashion. suppose the seats
The table below gives the number of cars, out of a random sample of 100 rental cars, belonging to each of the listed firms in 2005 and in 2007.
a production process is set to manufacture bolts with a diameter of 0.5 inches. if production is meeting these
Surveys of political opinion typically use a quota sample of 1000 voters with a new sample being selected each time. In the period before a general election, some organizations use panels. Suggest reasons for using a panel in preference to the mor..
Create a 90% confidence interval for the percentage of people the company contacts who may buy something. Explain what this interval means. Explain what "90% confidence" means.
a study found a strong positive correlation between ice cream consumption and the number of violent crimes committed
A vending machine is configured to accept only those quarters with weights between 5.550 g and 5.790 g. If 280 different quarters are inserted into the vending machine, what is the expected number of rejected quarters?
Distributed with a mean of 30 minutes and a standard deviation of 8 minutes. What is the probability that a randomly selected individual will have a waiting time between 15 and 45 minutes.
Construct and explain a 95% confidence interval estimate of the population proportion of all registered voters who voted in the last election.
on monday mornings the first national bank only has one teller window open for deposits and withdrawals. experience
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