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In a random sample of 12 adults from the U.S., the mean waste recycled per person per day was 1.4 pounds with a sample standard deviation of .3 pounds. Assume that the distribution of x = waste recycled per person per day is normal
(a) Construct a 95% confidence interval for the population mean.
(b) Instead of using the sample standard deviation, suppose you have historical data which indicates that the population standard deviation is .25 pounds. Construct a 95% confidence interval using this new information.
(c) Would your answer change if you did not know that the distribution of x = waste recycled per person per day is normal?
Reject H0 at β β = .01; there is evidence of a difference between the mean voter turnouts for urban, suburban, and rural precincts.
Minnesota Co. uses regression analysis to assess its economic exposure to fluctuations in the Canadian dollar. The dependent variable in the regressions is the monthly percentage change in the company's stock price, and the independent variable is..
1. The Statistical Abstract of the United States published by the U.S. Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds. The standard deviation of fresh fruit consumption is about 30 pounds.
in establishing a set of hypotheses which we are testing we rely on the standard error. what two parameters are used to
Which of the following statements regarding the coefficient of correlation is true. A value of 0.00 indicates two variables are not related.
complete the following hypothesis test ho ? 52 ha ? lt 52 ? 0.01 using the data below.55 47 58 55 39
The study involved 205 patients who were given either a treatment consisting of a combination of folic acid, vitamin B12, and vitamin B6 or a placebo for 6 months. Explain why a placebo group was used in this experiment.
ABC insurance sells term life insurance policies. If the plicy holder dies during the term of the policy ABC pays out $100000. If the person does not die ABC pays nothing and there is no further value to the policy.
What type of shape would you expect the histogram of the sample size to have? What value would you estimate for the mean of the histogram of sample means?
assume we want to use a .05 significance level to test the claim that p1ltp2. it we want to test that claim by using a
the lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15
explain what each part of the following statistical phrase means as it would be reported in apa format t4 2.87
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