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A sample of 200 rates of return on real estate investments was computed and recorded. the sample mean is calculated to be 12.10. Assume that the standard deviation of all rates of return on real estate is 2.1.
Questions;
The value for za/2 that will be used to calculate the 99% condidence interval is?
Estimate the mean of return on all real estate investments with 99% confidence.
A final exam in Math 157 is normally distributed and has a mean of 75 with a standard deviation of 12. If 36 students are randomly selected, find the probability that the mean of their test scores is greater than 70.
Without constructing the 98% confidence interval for the rate of effectiveness, would you expect the interval to be longer or shorter compared to the 95% confidence interval? Why?
Multiple regression equation relating expected travel cost (Y) number of days, (Y (x1) ) number of days on the road and distance traveled (X2).
Her mean waiting time was 7.4 minutes. Assume that the standard deviation has been historically known to be 2.2 minutes. At the .05 significance level, test the claim that the mean waiting time is less than 10 minutes.
there are twelve zodiac signs and each person is born under exactly one sign. suppose that each sign is equally likely
Based on this information, confidence level would be 90% that population mean is somewhere between?
Could you detail the value of using standard scores (Z scores) to compare relative performance of individual test scores.
Antidepressant is normally distributed with a mean of 6 lbs and a standard deviation of 3 lbs. What is the probability of weight gain? What is the probability of gaining between 0 and 12 lbs?
If the mean (Mu) diastolic blood pressure in a certain age group is 80, and the standard deviation (Sigma) is 10, what is the probability that, in a sample of 100, the sample mean (X) is > 85?
A job placement director claims that the average starting salary for nurses is 24,000.A sample of 10 nurses' salaries has a mean of 23, 450 and a standard deviation of 400. Is there enough evidence to reject the director's claim at 0.05 level of s..
Create a 95% confidence interval for mean cost of repairs. Interpret this interval.
The pie chart below shows the distribution of the citizens' answers. If there are citizens in the community, how many chose Birds, Hamsters, or Dogs?
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