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Reconsider the port alcohol content data from Exercise 14.22. A normal probability plot casts some doubt on the assumption of population normality. However, a dotplot shows a reasonable amount of symmetry, and the mean, median, and 5% trimmed mean are 19.257, 19.200, and 19.209, respectively. Use the Wilcoxon test at significance level .01 to decide whether there is substantial evidence for concluding that true average content exceeds 18.5.
Exercise 14.22. The article "A Method for the Estimation of Alcohol in Fortified Wines Using Hydrometer Baumé and Refractometer Brix" (Amer. J. of Enol. and Vitic., 2006: 486-490) gave duplicate measurements on distilled alcohol content (%) for a sample of 35 port wines. Here are averages of those duplicate measurements Use the Ryan-Joiner test to decide at significance level .05 whether a normal distribution provides a plausible model for alcohol content.
Out of a random sample 167 students pass an exam out of the 300. how do you calculate an exact 99% confidence interval for the proportion of sudents who passed the exam?
Test the hypothesis that smoking and lung cancer are independent. Use the 1 percent level of significance.
What are the respective sample means on "feelsafe" (Importance of Safety) for males and females from the SPSS Tables Set-1, when visiting a sports bar?
The production process for Bicycles can be described as taking Components and adding value to transform these into a Bicycle. The Home country applies a 20% import tari¤ at both stages of the production process:
Make for more scatter plots comparing GDP growth 1970-2000 to corruption, political rights, rule of law, and socio-political instability
in the linear programming formulation of the shortest route problem there is one constraint for each node indicatinga.
the united nations released the following annual birth rates and suicide ratesfor selected countriescountrybirth rate
we have a carton of 12 rechargeable batteries contains two that are defective. in how many ways can the inspector
an airline claims that 65 of its flights depart on time. a sample of 100 flights was examined and it was determined
the weight of food packed in certain containers is a random variable with a mean of 16 oz. and a standard deviation of
(a) State the hypothesis for a right-tailed test. (b) Obtain a test statistic and p-value assuming equal variances. Interpret these results. (c) Is the difference in mean scores large enough to be important?
(a) Find the mean, variance, and range for these data and interpret. (b) Find lower and upper quartiles, median and interquartile range. Check for any outliers and interpret. (c) Construct a box plot and interpret.
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