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A sample of 40 quarters was taken and it was found that the average weight was 5.522 g with a standard deviation of 0.078 g. Based on this random sample, construct a 95% confidnece interval estimate of the population MEAN of all quarters in circulation.(Assume that the population standard deviation is unknown.) Round your final calculation to three decimal places. What is the critical T value? What is the confidence interval?
The U.S. Dept of Treasury claims that it mints quarters to yield a mean weight of 5.670 g. Is this claim consistent with the convidence interval you just calculated? Explain your conclusion and account for any possible discrepancies. Conclusion:
Mary claims that the range, standard deviation and variance are all measures of dispersion. John adds to Mary's claim by stating that the coefficient of variation is a measure of relative dispersion.
multiple regression predicts a single dependent variable y from two or more independent x variables.mlr is a
Assume that in a hypothesis test with null hypothesis H 0 : μ = 14.0 at a = 0.05, that a value of 13.0 for the sample mean results in the null hypothesis not being rejected. That corresponds to a confidence interval result of:
After six months each pilot's cholesterol level is checked again. At the 0.01 significance level, can we conclude that the program was effective in reducing cholesterol levels?
Overall, the amount of work-hours involved in the festival preperation is normally distributed around 100 hours withn a standard deviation of 12 hours.
Standard deviation of this poll is 4%. What would be standard deviation if sample size were increased from 83 to 190?
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
Produce a printout of the frequency tables, showing the total of both frequencies.
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval? What percentage of times will the mean, or population proportion, not be found within the confidence ..
a cup of fourth of july candies contains 6 red 7 white and 8 blue candies. if five are randomly selected then what is
in 2008 a university in the midwestern united states surveyed its full-time first-year students after they completed
Miles traveled per day, and a sample standard deviation of 17.with 98% confidence. what is the interval in which the population mean miles travel.
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