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Question: Echinacea is an herb that may help to prevent colds and flu. Explain how researchers could conduct a double-blind, double-dummy experiment to compare echinacea tea with chewable vitamin C pills for effectiveness in preventing colds.
A random sample of rivets from 2 suppliers were compared to see what the mean diameter was from each and a test to determine whether the population means were the same for the 2 suppliers. Now a comparison of the variation in diameter is needed.
Create a 90% confidence interval for the mean annual rainfall in LA.- If you wanted to estimate the mean annual rainfall with a margin of error of only 2 inches, how many years data would you need?
Discuss James Madison's 1785 publication Memorial Remonstrance Against Religious Assessments as it relates to a 1784 General Assessment Bill proposed to the Virginia State Assembly.
When carrying out a hypothesis test for a population proportion, under what conditions is it appropriate to use the normal distribution as an approximation to the (theoretically correct) binomial distribution?
if a population has a standard deviation of 18 what is the minimum number of samples that need to be averaged in order
question to investigate the phenomenon of home team advantage a researcher recorded the outcomes from 64 college
x and s are equal to 3.7 and 0.5, respectively, find a 99% confidence interval for the mean pH in rainfall and interpret the interval.
Is coffee the key to success in a f2f Stat 200 class? (Would it be necessary in our on-line course?) FINALLY, what are some of the flaws in this observational analysis? How might it be better designed
If a woman gets a SAT score that is the 67th percentile, find her actual SAT score and her equivalent ACT score. If a woman gets a SAT score of 1220, find her equivalent ACT score.
Medical tests, such as those for detecting HIV, sometimes concern such sensitive information that people do not want to give their names when they take.
So which of our two main political parties is more concerned with achieving broad happiness, and which party is more concerned with fulfilling selfishness?
the business college computing center wants to determine the proportion of business students who have laptop computers.
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