Because of safety considerations, in May 2003 the Federal Aviation Administration (FAA) changed its guidelines for how small commuter airlines must estimate passenger weights. Under the old rule, airlines used 180 pounds as a typical passenger weight (including carry-on luggage) in warm months and 185 pounds as a typical weight in cold months.
The Alaska Journal of Commerce (May 25, 2003) reported that Frontier Airlines conducted a study to estimate average passenger plus carry-on weights. They found an average summer weight of 183 pounds and a winter average of 190 pounds. Suppose that each of these estimates was based on a random sample of 100 passengers and that the sample standard deviations were 20 pounds for the summer weights and 23 pounds for the winter weights.
- a. Construct and interpret a 95 % confidence interval for the
mean summer weight (including carry-on luggage) of Frontier Airlines passengers. - b. Construct and interpret a 95% confidence interval for the mean winter weight (including carry-on luggage) of Frontier Airlines passengers.
- c. The new FAA recommendations are 190 pounds for summer and 195 pounds for winter. Comment on these recommendations in light of the confidence
interval estimates from Parts (a) and (b).
Trending nowThis is a popular solution!
Chapter 9 Solutions
Bundle: Introduction to Statistics and Data Analysis, 5th + WebAssign Printed Access Card: Peck/Olsen/Devore. 5th Edition, Single-Term
- Find the mean hourly cost when the cell phone described above is used for 240 minutes.arrow_forwardName the four characteristics of a good definition.arrow_forwardTo compare average birth weight between autistics and non-autistic school children from the same school district, the investigator will use.arrow_forward
- One source says that the average distance from the earth to the moon is 384,467 kilometers. Another source says that the average distance from the earth to the moon is 384,000 kilometers. Can both of these descriptions be correct, or must at least one of them be wrong? Explain. Beckmann, Sybilla. Mathematics for Elementary Teachers with Activities, (p. 513). Pearson Education. Kindle Edition.arrow_forwardThe lengths (in feet) of the main span of the longest suspension bridges in the UnitedStates and the rest of the world are shown below. Which set of data is more variable?United States: 4205, 4200, 3800, 3500, 3478, 2800, 2800, 2310 World: 6570, 5538, 5328, 4888, 4626, 4544, 4518, 3970.arrow_forwardDetermine whether the variables is qualitative or quantitative number of infants born in a montharrow_forward
- When survey data indicated that a coffee company needed to improve its package-sealing process, an experiment was conducted to determine the factors in the bag-sealing equipment that might be affecting the ease of opening the bags without tearing the inner liner of the bag. Data were collected on 19 bags and the plate gap on the bag-sealing equipment was used to predict the tear rating of a bag. Complete parts (a) through (c). Click the icon to view the data table. a. Construct a 95% confidence interval estimate of the mean tear rating for all bags of coffee when the plate gap is 0.3. ☐ SHYX=0.3☐ (Type integers or decimals. Round to three decimal places as needed. Use ascending order.)arrow_forwardIdentify research topics that are well suited for survey research.arrow_forwardDetermine whether the underlined value is a parameter or statistics : "In 2017 national survey on teenager pregnancies, 10% of respondents aged 14 to 17 reported that they have a child before the age of 16 yrs."arrow_forward
- The Bureau of Meteorology of the Australian Government provided the mean annual rainfall (in millimeters) in Australia 1983–2002 as followsarrow_forwardBecause of the difficulty of weighing a Rabbit in the woods, researchers caught and measured 12 Rabbit, recording their weight, neck size, height, length, fur/hair color, and sex. They hoped to find a way to estimate weight from the other, more easily determined quantities. Which of the following are quantitative (numerical) variables for this study? Height Rabbit Sex Fur/Hair Color Weight Length Neck Size.arrow_forwardWhat is the relationship between the average income and the level of education in a given population, and how does this relationship vary across different regions and demographic groups?arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillCollege Algebra (MindTap Course List)AlgebraISBN:9781305652231Author:R. David Gustafson, Jeff HughesPublisher:Cengage LearningBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt
- Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGALElementary Geometry For College Students, 7eGeometryISBN:9781337614085Author:Alexander, Daniel C.; Koeberlein, Geralyn M.Publisher:Cengage,