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The same monitoring of radio-collared lions over the years suggests that the overall proportion of stalks that are the crouching type is about 0.87. Do the data above provide evidence that for this population of lions the proportion of crouching stalks of wildebeests and zebras is greater than what was originally thought? Use alpha=0.05
What is the standard error of his prediction?
A random sample of 900 homeowners in Delaware County is taken in order to estimate the average amount of money spent by homeowners on landscaping this spring. It turns out that this group spent an average of $200 with a standard deviation of $..
A business man must travel to five different destinations
what is the significance of hypothesis in research? what are type i and ii errors inhypothesis
Near the time of an election, a cable news service performs an opinion poll of 500 probable voters. It shows that the Republican contender has an advantage of 52% to 48%.a.Develop a 95% confidence interval for the proportion favoring the Republican c..
A 1982 study indicated that 40% of young adults (18-25 years old) in the U.S. smoked cigarettes. In a later survey of 1500 young adults, 536 were found to be smokers. Do the data indicate that the smoking rate for young adults in the U.S. has decreas..
Describe two designs that can address your research question. The designs must involve two different statistical analyses. For each design, specify and justify each of the four factors (statistical test, effect size, alpha level and beta level) and c..
The probability that a given bird house will be returned for a refund is 0.04. Suppose that 30 bird houses are sold on a particular day. Find the probability that exactly 2 of those bird houses will be returned for a refund.
The personnel director of a large corporation wants to study absenteeism among clerical workers at the corporation's central office during the year. A random sample of 25 clerical workers reveals the following. Absenteeism: X=9.7 days, S=4.0 days. 12..
a chemical company wished to study the consistency of the strength of one of its liquid chemical products. the product
We examined the use of heparin-PF4 ELISA screening for heparin-induced thrombocytopenia (HIT) in critically ill persons. Using C-serotonin release assay (SRA) as the way of validating HIT, the authors found that in 31 patients tested negative by SRA,..
Your statistics instructor claims that 60 percent of the students who take her Elementary Statistics class go through life feeling more enriched. For some reason that she can't quite figure out, most people don't believe her. You decide to check this..
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