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Sampling TV markets for a court case. A recent court case involved a claim of satellite television subscribers obtaining illegal access to local TV stations. The defendant (the satellite TV company) wanted to sample TV markets nationwide and determine the percentage of its subscribers in each sampled market who have illegal access to local TV stations. To do this, the defendant's expert witness drew a rectangular grid over the continental United States, with horizontal and vertical grid lines every .02 degrees of latitude and longitude, respectively. This created a total of 500 rows and 1,000 columns, or (500)(1,000) = 500,000 intersections. The plan was to randomly sample 900 intersection points and include the TV market at each intersection in the sample. Explain how you could use a random number generator to obtain a random sample of 900 intersections. Develop at least two plans: one that numbers the intersections from 1 to 500,000 prior to selection and another that selects the row and column of each sampled intersection (from the total of 500 rows and 1,000 columns).
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Chapter 1 Solutions
Statistics for Business and Economics (13th Edition)
- Cholesterol levels (in mg/dL) were collected from a random sample of 24 patients two days after they had a heart attack. Cholesterol Levels (in mg/dL) 236 226 For the data shown above, find the following. Do not round any of your answers. a) Find the 5-number summary: 160 220 236 310 244 210 288 294 276 234 288 360 272 278 280 270 266 142 242 206 186 318arrow_forwardCloud seeding, a process in which chemicals such as silver iodide and frozen carbon dioxide are introduced by aircraft into clouds to promote rainfall was widely used in many years. Recent research has questioned its effectiveness. An experiment as performed by randomly assigning 52 clouds to be seeded or not. The amount of rain generated was then measured in acre-feet. The box plot of the data for the seeded and unseeded clouds are shown in the figure. Which statement best interprets the box plot. Boxplot of Seeded, Unseeded 3000 f 2500어 2000 - 1500 - 1000 - 500- Seeded Unseeded a. Cloud seeding is somewhat effective in promoting rainfall because of the greater mean b. Outliers for both seeded and unseeded data may prove data on the effectiveness of cloud seeding is insufficient c. Extreme outliers are evident in the seeded data and has greater variance O d. There's a greater mean and greater dispersion in the seeded data. Both plots show outliers Dataarrow_forwardCloud seeding, a process in which chemicals such as silver iodide and frozen carbon dioxide are introduced by aircraft into clouds to promote rainfall was widely used in many years. Recent research has questioned its effectiveness. An experiment as performed by randomly assigning 52 clouds to be seeded or not. The amount of rain generated was then measured in acre-feet. The box plot of the data for the seeded and unseeded clouds are shown in the figure. Which statement best interprets the box plot. Boxplot of Seeded, Unseeded 3000 2500 - 2000- 1500 1000 500 Seeded Unseeded a. Outliers for both seeded and unseeded data may prove data on the effectiveness of cloud seeding is insufficient b. Cloud seeding is somewhat effective in promoting rainfall because of the greater mean c. There's a greater mean and greater dispersion in the seeded data. Both plots show outliers d. Extreme outliers are evident in the seeded data and has greater variance Dataarrow_forward
- The Current Results website lists the average annual high and low temperatures (degreesfahrenheit) and average annual snowfall (inches) for fifty-one major U.S. cities, based ondata from 1981 to 2010. The data are contained in the file Snow. for example, the average low temperature for Columbus, Ohio is 44 degrees and the average annual snowfallis 27.5 inches.a. Construct a scatter diagram with the average annual low temperature on the horizontalaxis and the average annual snowfall on the vertical axisarrow_forwardThe government sample survey of 60,000 households each month that produces data on employment, earnings, and many other variables is called the A. General Household Survey. B. Gallup Poll. C. Labor Statistics Survey. D. General Social Survey. E. Current Population Survey.arrow_forwardThe regional transit authority for a major metropolitan area wants to determine whether there is a relationship between the age of a bus and the annual maintenance cost. A sample of ten buses resulted in the following data. Click on the datafile logo to reference the data. DATA file Age of Bus Annual Maintenance (years) Cost ($) 1 350 370 2 480 2 520 2 590 3 550 4 750 4 800 790 5 950arrow_forward
- Floor Space. The U.S. Department of Housing and Urban Development compiles information on new, privately owned singlefamily houses. According to the document Characteristics of New Housing, in 2012 the mean oor space of such homes was 2505 sq ft and the median was 2306 sq ft. Which measure of center do you think is more appropriate? Justify your answer.arrow_forwardThe following monthly salaries for supervisors from six different counties were reported: $5456 (Kern), $5166 (Monterey), $4443 (Santa Cruz), $4129 (Santa Barbara), $2600 (Placer), and $2220 (Merced). San Luis Obispo County supervisors are supposed to be paid the average of the two counties among these six in the middle of the salary range. (a) Which measure of center determines this salary? medianmean What is its value? (Enter your answer as a whole number.)$ (b) Why is the other measure of center featured in this section not as favorable to these supervisors (although it might appeal to taxpayers)? Since the median salary is smaller, the median salary is less favorable to the supervisors.Since the mean salary is smaller, the mean salary is less favorable to the supervisors.arrow_forwardA number generator was used to simulate the percentage of people in a town who ride a bike. The process simulates randomly selecting 100 people from the town and was repeated 20 times. The percentage of people who ride a bike is shown in the dot plot. 10 20 30 40 50 60 70 80 90 100 Which statement is true about the population of the town? O Most likely, 50% to 60% of the town rides a bike. O Most likely, 60% to 75% of the town rides a bike. O Most likely, 40% to 50% of the town rides a bike. O Most likely, 80% to 90% of the town rides a bike.arrow_forward
- The histogram below gives the length of service of members of the Department of Chemistry at a particular university. The classes, in years of service, are 0−−4.9, 5−−9.9, etc., and the vertical axis represents the number of faculty. (a) What percent of the department faculty have 25 or more years of service? (b) If a member of the department is chosen at random to serve on a university committee, what is the probability (in decimal form) that the chosen representitive will have between 5 and 35 years of service? (c) What is the probability the representative above will have less than 30 years of service given that the person has less than 35 years of service?arrow_forwardTo compare average birth weight between autistics and non-autistic school children from the same school district, the investigator will use.arrow_forwardThe histogram below gives the length of service of members of the Department of Biology at a particular university. The classes, in years of service, are 0-4.9, 5-9.9, etc., and the vertical axis represents the number of faculty. (a) What percent of the department faculty have 15 or more years of service? Answer: ماما (b) If a member of the department is chosen at random to serve on a university committee, what is the probability (in decimal form) that the chosen representitive will have between 35 and 40 years of service? Answer: (c) What is the probability the representative above will have less than 15 years of service given that the person has less than 25 years of service? Answer: 9 8 7 6 5 4 3 2 1 % 8 5 10 Biology Faculty 15 20 25 Years of Service 38 35 48arrow_forward
- Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGALGlencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt
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