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Using the Wilcoxon Signed-Ranks Test. Paired sample data and use the Wilcoxon signed-ranks test to test the claim that the matched pairs have differences that come from a population with a median equal to zero.
Weather Forecasts? Listed below are actual high temperatures and the high temperatures forecast one day in advance (based on Data Set 11 in Appendix B). Use a 0.05 significance level to test the claim that the population of differences has a median of zero. What do the results suggest about the accuracy of the predictions?
Actual high temperature 80 77 81 85 73 73 80 72
High temperature forecast one day before 78 75 81 85 76 75 79 74
Complete hypothesis test using a 5% level for risk with directional research hypothesis.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
For these 4 questions below what would be the independent and dependent variables, the level of measurement and whether or not the variable is discrete or continuous.
A produce manager wants to estimate the mean size of coke bottle fills with 95 percent confidence. A preliminary sample of 12 bottles shows a sample standard deviation of 3 mil, and mean of 500.
SAT Math scores have a bell-shaped distribution with a mean of 515 and a standard deviation of 116. a) what percentage of SAT scores are between 399 and 631?
Both days have sample standard deviations of 3.4. Is the average mean of size different from day 1 to day 2?
Suppose we want to conduct a poll to estimate the proportion of voters who approve of the current mayor, and we plan to use a 95% confidence interval for our estimate.
Assuming an exponential service rate μ, set this up as a birth and death process and determine the birth and death rates.
The value of R-square indicates the amounts of variation in the dependent variable that is explained by the independent variable.
Calculate a standard error for the sample mean production rate for the new method and what is the standard error of the $1600 estimate?
Plot the data on U.S. general aviation shipments (b) Describe the patterns and discuss possible causes.(c) Would a fitted trend be helpful? Explain. (d) Make a similar graph for 1992-2003 only.
The sampling plan is perhaps the single most important aspect of generalizing research findings beyond the study sample. In a quantitative research study, what method of sampling allows for the greater generalization of findings?
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