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Hypothesis test for one population mean1. Agriculture books. The R.R Bowker Company collects information on the retail prices of books and publishes the data in the Bowker annual library and book trade almanac. In 2005, the mean retail price of agriculture books was $ 57.61.This year's retail prices for 28 randomly selected agriculture books are shown in the following table:59.54 67.70 57.10 46.11 46.86 62.87 66.4052.08 37.67 50.47 60.42 38.14 58.21 47.3550.45 71.03 48.14 66.18 59.36 41.63 53.6649.95 59.08 58.04 46.65 66.76 50.61 66.68At the 10% significance level, do the data provide sufficient evidence to conclude that this year's mean retail price of agriculture books has changed from the 2005 mean? Assume that the population standard deviation of prices for this year's agriculture books is $8.45. (Note: the sum of data is $1539.14)Hypothesis test for one population mean when σ is unknown1. Cardiovascular hospitalization. From the Florida state center for health statistics report, women and cardiovascular disease hospitalizations, we found that, for cardiovascular hospitalizations, the mean age of women is 71.9 years. At one hospital, a random sample of 20 of its female cardiovascular patients had the following ages, in years.75.9 83.7 87.3 74.5 82.578.2 76.1 52.8 56.4 53.888.2 78.9 81.7 54.4 52.758.9 97.6 65.8 86.4 72.4
From the past experience he knows that he population standard deviation is three days in testing to determine his blief he could use one of the following plans n=100 a=.01 n=75, a=.o5 n=50, a=.10.
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval?
A 56-question multiple choice test has 4 possible answers for each question and a student chooses the answers to each problem at random. A student selects 16 correct answers.
If incomes for the industry are distributed normally, what is the probability that a randomly selected firm will earn less than Arc?
Probability using normal distribution.Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity).
What is the standard deviation of the sampling distribution of p(hat) the proportion of all rolls of the die that show a 1 or a 2? 3.) describe the shape of the sampling distribution of p(hat).
An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed. If a sample of 16 bulbs has an average life of 50 hours and the population standard deviation is known to be 10 hours.
Describe meaning of alternatives, criteria and states of nature. Explain how are they utilized in decision analysis?
What happens to the Maximum Error of Estimate as the sample size gets larger?
Suppose that the average number of years to graduate at a university is 4 years, with a standard deviation of 0.5 years. From the Empirical Rule, what is a range of values that 95% of the students should graduate between?
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