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The student organization is planning to ask the sample of 50 students if they have observed alcohol abuse brochures on campus. Sample percentage who say "Yes" will be reported. Organization's statistical advisor says that standard deviation of this percentage will be about 7%.
a) Determine standard deviation be if sample contained 100 students rather than 50?b) How large the sample is required to decrease standard deviation of percentage who say "Yes" from 7% to 3.5%? Describe to someone who knows no statistics advantage of taking a larger sample in survey of opinion.
Determine the p-value, and at 95% confidence, test the hypotheses.
Compute the mean of the sampling distribution? Compute the standard deviation of sampling distribution?
In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95% confidence interval for the proportion of customers buying a mobile phone?
According to the U.S. Bureau of the Census, 75% of adults regularly drank alcohol in 1985. An investigator predicts that fewer adults drink now than drank then.
Cite an example of how you could/would apply a test of a hypothesis for a single population proportion, two tail test described in the lecture to real world situations?
Find the critical value to test the claim that all ages have purchase rates proportional to their driving rates.
Develop a point estimate of the population mean number of units sold per month. Develop a point estimate of the population standard deviation
What is the advantage of a randomized experiment in which the investigators randomly assign treatment conditions to subject over an observational study in which the subject self-select the treatment groups?
Calculate chi-square for the cross-tab. Show your work. Is there a statistically significant relationship between these variables?
Suppose a botanist grows many individually potted eggplants, all treated identically and arranged in groups of four pots on the greenhouse bench.
Now assume institutional cache is used. Hit rate for cache is 0.6. Determine the total average response time.
Discuss whether this variable should be placed in the model as an ordinary quantitative variable or by means of four 0, 1 indicator variables.
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