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Before 1918, approximately 57% of the wolves in the New Mexico and Arizona region were male, and 43% were female. However, cattle ranchers in this area have made a determined effort to exterminate wolves. From 1918 to the present, approximately 71% of wolves in the region are male, and 29% are female. Biologists suspect that male wolves are more likely than females to return to an area where the population has been greatly reduced.
Gender differences in dream content are well documented (Winget & kramer, 1979). Suppose a researcher studies aggression content in the dreams of men and women.
The mean driving time is 35 minutes with a standard deviation is 10 minutes. What is the 98 percent confidence interval for the population mean?
A number of years ago, there was a popular television game show called Let's Make a Deal. The host Monty Hall, would randomly select contestants from the audience and, as the title suggests
The area of study is Sampling Methods and the Central Limit Theorem. Consider the digits in the phone numbers on a randomly selected page of your local phone book a population.
Construction of confidence interval for difference between first and second sample mean revealed interval to be 10 plus or minus 12. We conclude.
State the alternate hypothesis for this study? What critical value should be used to determine the rejection region? Use the 1 proportion Z-test.
A recent study compared the time spent together by single- and dual-earner couples. According to the records kept by the wives during the study, the mean amount of time spent together watching television among the single-earner couples
An environmentalist estimate that the mean waste recycle by adults in the country is more than 1 pound per person per day. You want to test this claim, you find that the mean waste recycled per person per day for a random sample of adults in the c..
Suppose they solicit 400 customers one day, and find that 250 of them have a Grayson's card. Assume that 60% of all Grayson's customers have a discount card, what is the probability of getting a sample proportion of at least 250 / 400=0.625?
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.
I'm having difficulty understanding and showing in layman terms or simple terms an example and comparison between the ANOVA test, Kruskal-Wallis test, and T-Test Statisitc.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcox on rank-sum test, evaluate the significance of the results, assuming there are no ties.
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