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A confidence interval estimate for the population mean is given to be (37.46, 46.39). If the standard deviation is 11.337 and the sample size is 35, answer each of the following (show all work):
A) Determine the maximum error of the estimate, E.
B) Determine the confidence level used for the given confidence interval.
Construct a 98 percent confidence interval estimate of the difference between the two sample means (Please show work).
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
Do hotel managers on average vary significantly in femininity score from men in general?
A medical researcher estimates that no more than 55% of the U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say that they eat breakfast every day.
What is the standard deviation of expected returns for Stock X? For Stock Y?
find probabilty that the average of those counts is more than 83.0 mosquitoes per square meter. Assume the variable is normally distributed.
Mean threshold values and standard deviations for the three groups are given below. Normal probability plots showed the three populations were well approximated by the Normal distribution.
At one Las Vegas casino, if you net $5 that a 12 will come up as the total points on two dice, and you win, you will get back $50. If any total other than 12 comes up, you get back $0.
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
This model is fit to the data using the method of least squares using statistical software, and the following ANOVA table is obtained
Why do so many of life's events share the same characteristics with Central Limit Theorem? Why are estimations and confidence intervals important?
A random sample of stipends of teaching assistants in economics is listed below. Is there sufficient evidence at the alpha=.05 level to conclude that the average stipend different from $15,000? The data is listed below:
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