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Consider the following results for two samples randomly taken from two populations.
Sample A Sample B
Sample Size 150 150
Sample Mean 412 405
Sample Std Deviation 128 54
A. At a .01 level of significance, test whether there is a difference between the 2 sample means.
b. Construct a 99 percent confidence interval estimate of the difference between the two sample means.
Is there a meaningful relationship between grades and SAT scores? If a student scores a 450 on the SAT what will her GPA be?
A process follows the binomial distribution with n = 8 and p = .3. Find
A stationary store wants to estimate the mean retail value of greeting cards that it has in inventory A random sample of 100 greeting cards. a mean value of 2.55 and standard deviation of 0.44
A researcher was interested in determining whether incentives affect the response rate in surveys. A simple random sample of 50 adult residents of a large city was selected. All were mailed a survey and promised a check upon returning a completed ..
Let 3 trails (they may not be independent), each of which is either success or not. Let X denotes number of successes. Assume E[X] = 1.8. Determine the largest possible value of P(X=3)?
A college believes that 28% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried to within 5 percentage points with 95% confidenc..
Conclude the finite population, correction factor.With the population size of 1,000 and a planned sample size of 200, what is the finite population, correction.
Use these statistics to construct a 94% confidence interval for the mean monthly consumption for the population of all Ontario households.
What is the probability that the student is both a sophomore and a history major?
How would you use the binomial distribution in making a business decision during a normal day of work in the career of your choice?
I have a problem that wants to know the sample size of Illinois republican voters, they want to know the sample size with 95% confidence and 3% margin of error, not sure how to get started.
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
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