# Statistics Quiz

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i need this done in 45 min and will pay what I need to.. Internet has been down for three days with no access.Part 1 of 3 -Question 1 of 201.0 PointsAccepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), “E” or “e” (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker.Complex numbers should be in the form (a + bi) where “a” and “b” need to have explicitly stated values.For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not.A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of years served was 13.8 years with a standard deviation of 7.3 years. What is the 95% confidence interval estimate for the average number of years served by all Supreme Court justices? Place your limits, rounded to 1 decimal place, in the blanks. Place you lower limit in the first blank.Reset SelectionQuestion 9 of 201.0 PointsCompute      where t15 has a t-distribution with 15 degrees of freedom.Reset SelectionQuestion 10 of 201.0 PointsIf you are constructing a confidence interval for a single mean, the confidence interval will___________ with an increase in the sample size.Reset SelectionQuestion 11 of 201.0 PointsIn a study of elephants a researcher wishes to determine the average weight of a certain subspecies of elephants. From previous studies, the standard deviation of the weights of elephants in this subspecies is known to be 1500 pounds. How many elephants does the researcher need to weigh so that he can be 80% confident that the average weight of elephants in his sample is within 350 pounds of the true average weight for this subspecies?Reset SelectionQuestion 12 of 201.0 PointsA previous study of nickels showed that the standard deviation of the weight of nickels is 150 milligrams. How many nickels does a coin counter manufacturer need to weigh so that she can be 98% confident that her sample mean is within 25 milligrams of the true average weight of a nickel?Reset SelectionQuestion 13 of 201.0 PointsA sample of 25 different payroll departments found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. What is the 90% confidence interval for the average days worked by employees in all payroll departments?Reset SelectionQuestion 14 of 201.0 PointsThe upper limit of the 90% confidence interval for the population proportion p, given that n = 100; and    = 0.20 isReset SelectionQuestion 15 of 201.0 PointsConfidence intervals are a function of which of the following three things?Reset SelectionQuestion 16 of 201.0 PointsFind the 95% confidence interval for the standard deviation of the lengths of pipes if a sample of 26 pipes has a standard deviation of 10 inches.Reset SelectionQuestion 17 of 201.0 PointsIn order to be accepted into a top university, applicants must score within the top 5% on the SAT exam. Given that SAT test scores are normally distributed with a mean of 1000 and a standard deviation of 200, what is the lowest possible score a student needs to qualify for acceptance into the university?Reset SelectionQuestion 18 of 201.0 PointsFrom a sample of 500 items, 30 were found to be defective. The point estimate of the population proportion defective will be:Reset SelectionPart 3 of 3 -Question 19 of 201.0 PointsA 90% confidence interval estimate for a population mean is determined to be 72.8 to 79.6. If the confidence level is reduced to 80%, the confidence interval becomes narrower.Reset SelectionQuestion 20 of 201.0 PointsThe lower limit of the 95% confidence interval for the population proportion p, given that n = 300; and    = 0.10 is 0.1339.Reset Selection