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The average serum cholesterol level in a certain group of patients is 240 milligrams. A new medication is designed to lower the cholesterol level in this population after one month. A sample of 60 people in the population used the medication for 30 days, after which their average cholesterol level was 232 milligrams with a standard deviation of 18 milligrams. The manufacturer of the new medication would like to see if the average cholesterol level in the population has been reduced.
1. Using statistical notation, specify the appropriate null and alternative hypotheses.
2. Calculate the p-value for the hypothesis test.
3. Make a decision, "reject" or "do not reject," at the a = 0.05 level. Explain your reasoning.
4. Based on the decision you made in question #7, what type of error might you have made?
5. Calculate a 95% confidence interval for µ, the average serum cholesterol level in the population after one month.
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
consider a standard deck of 52 cards which is shuffled so the cards are randomly ordered in the deck. five cards are
Assume that the two groups come from populations with the same standard deviation. Test the claim that the mean score of women is equal to a mean score of men using a 0.02 significance level.
A random sample of 10 observations from one population revealed a sample mean of 23 and a sample deviation of 4. A random sample of 8 observations from another population revealed a sample mean of 26 and a sample standard deviation of 5.
Determine the margin of error in estimating the population mean. Sample of 68 college students yields a mean annual income of $3248. Assuming that the standard deviation = $885.
consider a simple card game where there are four cards labeled 1 2 3 and 4. each round my friend first draws a card
Privacy Are your finances, buying habits, medical records, and phone calls really private? A real concern for many adults is that computers and Internet are reducing privacy. A survey conducted by Peter D.
a company studied the number of lost-time accidents occurring at its brownsville texas plant. historical records show
What are examples in which non-parametric tests are used to analyze business related problems in general, and more specifically, problems related to marketing?
Calculate the correlation coefficient, coefficient of determination. Check whether there is a relation between correlation coefficient and coefficient of determination.
question suppose that 11 individuals take the gmat graduate management admission test then take a gmat preparation
A researcher studies the effect of cognitive psychotherapy on positive self-regard. The number of positive statements made about oneself is recorded for each participant during the first meeting.
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