For its “Music 360" survey, Nielsen Co. asked teenagers and adults howeach group has listened to music in the past 12 months. Nearly two-thirds of U.S. teenagers under the age of 18 say they use Google Inc'svideo-sharing site to listen to music and 35% of the teenagers said theyuse Pandora Media Inc's custom online radio service (The Wall StreetJournal, August 14, 2012). Suppose 10 teenagers are selected randomlyto be interviewed about how they listen to music. Answer questions 7-10. For a sample of 10 teenagers, compute the variance and standarddeviation of the number of teenagers who use Pandora Media Inc.'sonline radio service.

Answered: For its "Music 360" survey, Nielsen Co.…

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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Kim Kardashian is interested in studying the phenomenon of selfies more deeply. She randomly selects 20 of her Instagram followers' feeds. For each selected feed, she records the number of selfies posted in the past year and the number of people in the foreground of the picture. What is the sample of this study?
According to a retail organization, holiday shoppers spent an average of $935.58 over the Thanksgiving weekend in 2016. The accompanying data show the amount spent by a random sample of holiday shoppers during the same weekend in 2017. $1,029 $875 $969 $838 $825 $813 $962 $1,032 $990 $996 $921 $664 $1,013 $1,030 $979 $878 Complete parts a through c. Test the hypothesis that shoppers spent less than an average of $935.58 over the Thanksgiving weekend in 2017 using α=0.05.
A poll tracks the favorite sport of Americans who follow at least one sport. Results of the poll show that professional football is the favorite sport of 33% of Americans who follow at least one sport, followed by baseball at 15%, men's college football at 10%, auto racing at 6%, men's professional basketball at 5%, and ice hockey at 5%, with other sport at 26%. Consider a survey in which 344 college undergraduates who follow at least one sport were asked to identify their favorite sport produced the following results: Professional Football 113 Baseball 38 Men's College Football 47 Auto Racing 12 Men's Professional Basketball 8 Ice Other Hockey Sports Find the p-value. (Round your answer to four decimal places.) p-value = 19 107 Do college undergraduate students differ from the general public with regard to their favorite sports? Use α = 0.05. State the null and alternative hypotheses. O Ho: Undergraduate students do not differ from the general public with regard to their favorite…
Researchers at Purdue University and Wichita State University found that airlines are doing a better job of getting passengers to their destinations on time.t AirTran Airways and Southwest Airlines were among the leaders in on-time arrivals with both having 88% of their flights arriving on time. But for the 12% of flights that were delayed, how many minutes were these flights late? Sample data showing the number of minutes that delayed flights were late are provided in the file named AirDelay. Data are shown for both airlines. Assume population variances are unknown and unequal. AirTran Southwest 34 59 | 43 30 3 45 64 42 33 66 32 42 | 85 30 48 105 45 28 | 38 85 110 50 10 33 50 26 70 75 45 63 52 83 78 27 70 42 35 33 64 65 27 90 38 52 76 (a) Formulate the hypotheses that can be used to test for a difference between the population mean minutes late for delayed flights by these two airlines. (Let u, = population mean minutes late for delayed Airtran flights and u, = population mean minutes…
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for its Music 360 survey, Nielsen Co. asked teenagers how they listened to music in the past 12 months. Nearly two-thirds of U.S. teenagers under the age of 18 say they use google Inc.’s video-sharing site to listen to music and 35% of the teenagers said they use Pandora Media Inc.’s custom online radio service (the wall street Journal, August 14, 2012). Sup- pose 10 teenagers are selected randomly to be interviewed about how they listen to music. Is randomly selecting 10 teenagers and asking whether or not they use Pandora Media Inc.’s online service a binomial experiment? What is the probability that none of the 10 teenagers uses Pandora Media Inc.’s online radio service? What is the probability that 4 of the 10 teenagers use Pandora Media Inc.’s online radio service? What is the probability that at least 2 of the 10 teenagers use Pandora Media Inc.’s online radio service?
Q8 Digital video recorders allow us to skip commercials when watching TV. Some allow advertisers to see which ads are watched. A study used this technology in a sample of 2507 homes in a city. XYZ monitored viewer's reactions to ABC product ad that featured the band Rog. The ad won critical acclaim, but XYZ found that only 77% of households saw the ad. An analysis indicates that an ad has to be viewed by 76% or more households to be cost effective. Based on this test, should the local sponsor run this ad?
A survey conducted by a song rating service finds that the percentages of listeners familiar with "Poker Face" by Lady Gaga who would give the song ratings of 5, 4, 3, 2, and 1 are, respectively, 43 percent, 21 percent, 22 percent, 7 percent, and 7 percent. Assign the numerical values 1, 2, 3, 4, and 5 to the (qualitative) ratings 1, 2, 3, 4, and 5 and find an estimate of the probability distribution of x = this song’s rating by a randomly selected listener who is familiar with the song. Find the expected value of the estimated probability distribution. (Round your answer to 2 decimal places.)
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By a small margin, Facebook remains the top choice of social media over all ages, with 29% using Facebook most often among those using social media sites. However, more visually oriented social networks such as Snapchat and Instagram continue to draw in younger audiences. When asked "Which one social networking brand do you use most often?" the results in the table show the top brands chosen by Americans aged 12-34 who currently use any social networking site or service. Social M edia Site Faceboo k Snapchat Instagra m Twitter Percentage That Use Most Often 29 28 26 6 20 (a) What is the sum of the percentages for these top social media sites? Give your answer as an exact number. Macmillan Learning top social media sites: What percent of Americans aged 12-34 use other social media sites most often? Give your answer as an exact number. other social media sites: do %

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