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A simple random sample of 60 items resulted in a sample mean of 90. The population standard deviation is 12.
a. Compute the 95% confidence interval for the population mean (to 1 decimal).
b. Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
c. What is the effect of a larger sample size on the margin of error?
Set up a hypothesis test. Is Charmers' truthful? Describe by working through hypothesis test.
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula.
A researcher is comparing two antihypertensive drugs A and B with regards to reduction of patient's systolic blood pressure (SBP). Baseline SBP is measured for two groups of patients.
The analysis of variances produces df between = 3 and df within = 24. For this analysis, determine df total ?
To maximize Andre's probability of landing on the net, how far away from the cannon should he position the nearest edge of the net?
Is your sample of MSU students significantly different from the population of MSU students in terms of the number of classes they take per semester (use alpha level .05)? To answer this question, follow all of your steps for hypothesis testing.
Give an example of a hypothesis test. State what the Null and the Alternative hypotheses.
Suppose that n trials of a binomial experiment result in no successes.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
If and are the proportions of all college males and females correspondingly, who worked last summer, the z statistic (±0.01) for a test comparing the proportions of college men and women who worked last summer is??
The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting, Inc. during the first quarter of 2004.
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