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Suppose that weekly use of gasoline for motor vehicle travel by adults in North America has approximately a normal distribution with a mean of 20 gallons and a standard deviation of 6 gallons. Many people who worry about global warming believe that Americans should pay more attention to energy conservation. Assuming that the standard deviation and the normal shape are unchanged, to what level must the mean reduce so that 20 gallons per week is the third quartile rather than the mean?
When is it important to have matched pairs rather than two independent sets of data?
The Wilcoxon signed rank statistic, The mean for the Wilcoxon signed rank test and The P-value for the Wilcoxon signed rank test
Support colour-coding on packaged food to indicate healthier options
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
In which category is ANOVA properly classified?
Develop a frequency distribution table with proportions. What is an experiment? Can you describe what a Group Frequency Distribution Table is and what it looks like?
A human society claims that less than 36% of US. households own a dog. In random sample of 397 U. S. households, 151 say they own a dog. At mean=0.03, is there enough evidence to support the society's claim?
Make a decision regarding the null hypothesis based on the sample information. Interpret the results of the test and state your conclusion.
The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test.
95% confidence interval evaluate for proportion of Americans who believe Abraham Lincoln is United States' most outstanding President is 65% to 75%. If more precise estimate is requested, then confidence level.
Carry out test of independence to find out whether employee health insurance coverage is independent of size of company. Use α = 0.05 level of significance.
Calculate the Coefficient of Skewness and the Coefficient of Variation for time spent working on QM.
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