Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its average number ofunoccupied seats per flight over the past year nationally (assuming a normal distribution at population level). To accomplish this,the records of 20 flights are randomly selected, and the number of unoccupied seats is noted for each of the sampled flight. Thedescriptive statistic for the data is displayed below.Number of Unoccupied SeatsMeanMedianModeStandard DeviationSample VarianceKurtosisSkewnessRangeMinimumMaximumSumCount12111121.252631.6136071.0595521952423820Based on the sampled 20 flights, a 95% confidence interval for the number of unoccupied seats yeilds:A [10,14] using a Z critical value[10,14] using at critical valueC) [3,21] using a Z critical valueD [3,21] using at critical value

The question is about confidence interval.Given :Randomly selected no. of flights = 20Mean of the…

Answered: Unoccupied seats on flights cause…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Why is it important to report both a measure of central tendency and variability to describe a set of scores? Group of answer choices Sets of data with different central tendencies may have different patterns of variability. Sets of data with the same central tendency may have the same patterns of variability. Sets of data with the same variability may have different patterns of central tendency. Sets of data with the same central tendency may have different patterns of variability.
2. Scores in the first and fourth (final) rounds for a sample of 20 golfers who competed in PGA tournaments are shown in the following table (Golfweek, February 14, 2009, and February 28, 2009). Suppose you would like to determine if the mean score for the first round of a PGA Tour event is significantly different than the mean score for the fourth and final round. Does the pressure of playing in the final round cause scores to go up? Or does the increased player concentration cause scores to come down? Player First Round Final Round Sleve McDichael 72 72 Onson Sweemey 68 68 Darryl Archideld 72 72 Anatoli Smorin 68 68 Rey McScriff 73 73 Glenallen Mixon 69 69 Mario McRlwain 74 74 Raul Chamgerlain 69 73 Mike Sernandez 70 73 Tony Smehrik 71 69 Player First Round Final Round Bobson Dugnutt 73 75…
Construct a quantile graph. Explain why or why not the data set provided has a normal distribution: 5.5, 6.0, 6.4, 5.7, 7.5, 4.5, 5.5, 5.6, 6.5, 6.0, 5.0, and 6.0. include the graph and response.
If a distribution is positively skewed, then Select one: a. mean median > mode c. median > mean > mode d. mean = mode = median
The second slide is the first part of the question and the first slide is the second part of the question.
Used car auctions give car dealers an opportunity to increase their used car inventory by purchasing cars used as rental cars, assigned to company executives, and other similar activities. Suppose population 1 is all black cars sold at used car auctions, and population 2 is all white cars sold at used car auctions. Of interest is to estimate the difference in the mean sale price of all black cars sold at used car auctions and the mean sale price of all white cars sold at used car auctions. Based on this, using both the appropriate symbol and in words, state the one parameter of interest.
4. In an effort to estimate the size of elk herds wintering in Rocky Mountain National Park, the rangers used a small airplane to spot count groups of elk in the park. They found 15 groups of elk and recorded the size of each group as: 21 15 19 16 18 17 17 20 25 7 7 16 10 16 18 12 Compute the mean, the median and the mode of the data.
a) Determine the values of * and **. b) Give the unbiased point estimate for the average monthly earning from Hyundai Vehicles. c) Give the unbiased point estimate for the variance of monthly earning from Hyundai Vehicles.
Find the mean, median, and mode for a random sample of eight U.S. corporations with the following percentage changes in earnings per share in the current year compared with the previous year: 0% 0% 8.1% 13.6% 19.4% 20.7% 10.0% 14.2%

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