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Construct 90, 95, and 99 percent confidence intervals for the population mean, and state the practical and problistic interpretations of each. Indicate which interpretation you think would be more appropriate to use when discussing confidence intervals and the reason for your choice. Explain why the three intervals that you construct are not of equal width. Indicate which of the three intervals you would prefer to use as an estimate of the population mean, and state your reason.
We wish to estimate the mean serum indirect bilirubin level of 4-day-old infants. The mean for a sample of 16 infants was found to be 5.98 mg/ 100 cc. Assume the bilirubin levels in 4-day-old infants are approximately normally distributed with a standard deviation of 3.5 mg/ 100 cc.
The intensity and frequency of hurricanes increases by 2% over the historical projections and claims increase proportionately. Evaluate data using the appropriate test for significance. Rationale for using the test is clear.
the reading speed of a second grade students approximately normal with a mean of 90 words pe rminute and is a standard
If 16 measurements are taken and the standard deviation is 2.1 mg/dl is there enough evidence to support the claim that her standard deviation is greatear than the target at a = 0.01?
Assume the chief does not want his officers to cite a car for speeding unless they are 99% sure that it is travelling at 58 miles per hour or faster. What is the minimum estimate of speed at which a car should be cited for speeding?
The amounts of money requested on home loan applications at a particular bank follow the normal distribution, with a mean of $80,000 and a standard deviation of $24,000. A loan application is received during the day.
Suppose you were preparing two-way tables of percentages for the following pairs of variables. How would you run the percentages?
If Z = 1.96, s = 3, and E = 1, determine the correct sample size.
if they expect to satisfy about 80 orders in the next financial quarter, what is the probability that they will break their previous export record?
The amounts dispensed by a cola machine follow the normal distribution with a mean of 7 ounces and a standard deviation of 0.10 ounces per cup.
economics is about allocation of limited resources to their best use. similar to the rest of economy healthcare sector
For each variable, identify the kind of graph that should be used to display the distribution of scores (histogram, polygon, or bar graph).
At a recent meeting of educational researchers comparison were made between the type of college freshmen attend and the numbers who drop out. Use a significance level of .05 and determine if the type of school and the drop out rate are independent.
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