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A lab in Alaska is interested in finding the mean chloride level for a healthy resident. A sample of 90 residents have a mean chloride level of 103. It is known that the chloride level in Alaska has a standard deviation of 35. Find the 99% confidence interval for the true mean chloride level of all healthy Alaskan residents.
What is the lower limit of the 99% confidence interval?
What is the upper limit of the 99% confidence interval?
It is suspected that a random variable has a normal distribution with a mean of 6 and a standard deviation of 0.5. After observing several hundred values, we find that the mean is approximately equal to 6 and the standard deviation is close to 0.5..
for the following claim find the null and alternative hypothesis test statistic pvalue critical value and draw a
What does this confidence interval mean? Why might decision makers be interested in such an interval?
Given the following data, use exponential smoothing with a=0.2 and a=0.5 to generate forecasts for periods 2 through 6. Use MAD and MSE to decide which of the two models produced a better forecast.
A point estimate for a parameter is a single number designed to estimate a quantitative parameter of a population, usually the value of the corresponding sample statistic
Assuming the requirements of ANOVA are satisfied, at the .05 level of significance, is there evidence of a significant difference among the mean wait times at the five checkpoints?
What is the probability that a randomly selected patient is admitted for something other than coronary care? (Note that heart disease is a coronary care issue.)
at the beginning of a particular work shift a machine is in one of three states operating properly operating in a minor
For a random sample of 23 European countries, the variance on life expetancey was 7.3 years. What is the 95% confidence interval for the variance of life expectancy in all of Europe?
Find the probility that a randomly selected student has neigther credit card. Find the probability that a randomly selected student has a Mastercard or a Visa or both.
for the xy data below computea r and determine if it is significantly different from zerob the slope of the regression
Use an appropriate 95 percent confidence interval to estimate the difference between the mean prices of the two brands of cd players. Do you think that the difference haspractical importance?
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