Margin of error for survey
A survey of 400 rural voters indicated that 250 favor annexation by the city. What is the margin of error for this survey at the 95% level of confidence?
A .0474
B .049
C .0398
D .0411
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For what percentage of the samples did you reject the null hypothesis?5) The population mean in this problem really is 100 because of the way we set up the calculator so the null hypothesis is true. We are testing the claim that the mean is not 10
A company manager thinks he overpaying fertilizer at $174 per ton. To find out, he collects fertilizer prices per ton from five distributors. Construct a 90% confidence interval from his result : 128, 140, 170, 166 and 156
Whats the company's expected profit on the policy? What's the standard deviation?
Find the mean (expected) number of times the lion will be successful. Find the probability the lion will fail to capture it prey at least 25 times.
The animal colony at a hospital contains 20 female rats and 30 male rats. Of the 20 females, 15 are white and 5 spotted. Of the 30 males, 15 are white, and 15 are spotted. Suppose that you randomly select 1 rat from this colony. What is the probab
Standard error of means decreases in proportion to the inverse of the square root of the sample size. A histogram of sample means will approximately follow a Normal distribution
A survey of 400 cell phone users indicated that 55% were dissatified with their current provider. At a = .01, can you conclude that more than 50% of all cell phone users are dissatified with their current provider?
Assuming that the average noise level of hospitals is what it's supposed to be, what is the probability of a sample of 81 hospitals producing an average as high as our sample's (p-value)? Which comes from a test-statistic of z= (without sign)
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