Concept explainers
A mobile computer network consists of a number of computers (called nodes) that communicate with each other while moving throughout a region. A node that is out of transmission
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Statistics for Engineers and Scientists
- Consider a dataset of N = 10⁹ nodes and L = 6 x 105 links. Assuming that the data is well described by a random graph model would you expect to find a giant component in the network? Select one: O a. Yes O b. Noarrow_forwardA study identified Bridgeport, Connecticut, San Jose, California, Washington, D.C., and Lexington Park, Maryland as the four U.S. cities with the highest percentage of millionaires. The following data show the following number of millionaires for samples of individuals from each of the four cities. Millionaire Yes No Bridgeport, CT 49 451 % % O Ho: PB #PL# PN* PW = San Jose, CA % % 40 260 Ha: : Not all population proportions are equal. City (a) What is the estimate of the percentage of millionaires in each of these cities? (Round your answers to two decimal places.) Bridgeport, CT San Jose, CA Washington, D.C. Lexington Park, MD H₂: : All population proportions are equal. Washington, D.C. Lexington Park, MD O Ho: At least two of the population proportions are equal. Ha: : None of the population proportions are equal. (b) Using a 0.05 level of significance, test for the equality of the population proportion of millionaires for these four cities. State the null and alternative…arrow_forwardA market research group is interested in estimating the market share of three airline companies, A, B and C, operating on a particular flight path. These three airlines are the only companies operating on this route. Airline B claim that they have 50% of the business with the remaining percentage shared equally amongst airlines A and C, i.e. 25% each. The market research group decide to carry out an independent study and question a random sample of 97 people visiting an airport on a particular day. Each person was given price, timetables and service details of flights on this route for each of the three airlines. Provided with this information they were asked to select their airline of choice.The survey revealed the following observed frequencies Airline A - 26 Aurline B - 49 Airline C - 22 Test if there is any evidence to suggest that the airline's claim is incorrect, at significance level α = 0.05. Complete the test by answering the following questions : Which of the following is the…arrow_forward
- The Vice-President for Academic Affairs of SLU wished to understand the distribution of students in the academic programs in the institution for the first semester of school year 2020-2021. The numbers of students by school are the following: School Number of Students Teacher Education and Liberal Arts 2,069 Natural Sciences 2,565 Nursing 3,672 Engineering and Architecture 6,534 Accountancy, Management, Computing and Information Studies 8,381 Law 1,588 Medicine 1,418 Total Do these data contradict a claim that the distribution of students in the academic programs is uniform?arrow_forwardConsider a dataset of N = = 6 × 105 links. Assuming that the data is well described by a random graph model would you expect to find a giant component in the network? Select one: a. Yes 106 nodes and L b. Noarrow_forwardAn article reported the estimated percentage of U.S. households with only wireless phone service (no landline) for the 50 states and the District of Columbia. In the accompanying data table, each state was also classified into one of three geographical regions—West (W), Middle states (M), and East (E). Wireless % Region State Wireless % Region State 43.4 M AL 40.9 W MT 39.6 W AK 46.6 M NE 49.3 W AZ 48.5 W NV 56.2 M AR 43.5 M ND 42.9 W CA 31.2 E NH 50.5 W CO 25.2 E NJ 26.8 E CT 46.9 W NM 29.4 E DE 31.1 E NY 49.7 E DC 42.8 E NC 47.7 E FL 45.8 E OH 45.9 E GA 50.5 M OK 38.4 W HI 47.1 W OR 56.1 W ID 30.0 E PA 45.8 M IL 34.7 E RI 47.6 M IN 49.6 E SC 50.8 M IA 41.4 M SD 51.5 M KA 46.6 M TN 47.1 M KY 54.6 M TX 40.8 M LA 52.1 W UT 40.7 E ME 41.0 E VA 36.1 E MD 37.1 E VT 31.5 E MA 48.4 W WA 47.7 M MI 37.2 E WV 43.0 M MN 46.5 M WI 55.1 M MS 51.8 W WY 51.6 M MO (a) Construct a comparative boxplot that makes it possible to compare…arrow_forward
- Television sets are given a final inspection following assembly. Three types of defects are identified, critical, major, and minor defects, by a mail-order house. Data are analyzed with the following results. Sets having no 75% defects Sets having only 2% critical defects Sets having only 5% major defects Sets having only 7% minor defects Sets having only 3% critical and major defects Sets having only 4% critical and minor defects Sets having only 3% minor and major defects Sets having all 1% three types of defects What is the probability that a randomly selected set has a critical or major defeca? OA. 0.10 OB. 0.35 OC. 0.25 OD. 0.01 OE. 0.30arrow_forwardA network provider investigates the load of its network. The number of concurrent users isrecorded at Seventy -seven locations (thousands of people),55.3 55.3 55.3 55.9 55.9 55.9 55.9 56.1 56.1 56.1 56.156.1 56.1 56.8 56.8 57.0 57.0 57.0 57.8 57.8 57.8 57.957.9 57.9 58.8 58.8 58.8 59.8 59.8 59.8 62.2 62.2 63.863.8 63.8 63.9 63.9 63.9 64.7 64.7 64.7 65.1 65.1 65.165.3 65.3 65.3 65.3 67.4 67.4 67.4 67.4 68.7 68.7 68.768.7 69.0 70.4 70.4 71.2 71.2 71.2 73.0 73.0 73.1 73.174.6 74.6 74.6 74.6 79.3 79.3 79.3 79.3 83.0 83.0 83.0i. Construct a grouped frequency distribution for the data using five classes. ii. Compute the sample mean, variance, and standard deviation of the number ofconcurrent users.iii. Construct a frequency histogram for the datab) It is reported that the number of concurrent users follows a positive skew distribution.Does the histogram support this claim?arrow_forwardIn sociology, a personal network is defined as the people with whom you make frequent contact. A research program used a stratified random sample of men and women born between 1908 and 1937 to gauge the size of the personal network of older adults. Each adult in the sample was asked to "please name the people you have frequent contact with and who are also important to you." Based on the number of people named, the personal network size for each adult was determined. The responses of 2,824 adults in this sample yielded statistics on network size, that is, the mean number of people named per person was 14.6, with a standard deviation of 10.4. Complete parts a through c. a. Form a 95% confidence interval for the mean personal network size of all older adults. (|| D (Round to the nearest hundredth as needed.) b. Give a practical interpretation of the interval found in part a. Choose the correct answer below. O A. We can be 5% confident that any network size lies between the lower bound…arrow_forward
- A researcher is interested in examining whether the location that a person lives is related to the number of hours that they spend on the internet each week. The researcher collected data from a sample of 30 participants who were classified in one of three groups: (1) 10 people who live in an urban setting, (2) 10 people who live in a suburban setting, and (3) 10 people who live in a rural setting. Each participant reported the number of hours they spend on the internet in a typical week (the dependent variable). The researcher found the following descriptive statistics: Urban participants reported an average of 8.9 hours of internet use per week with a standard deviation of 2.77. Suburban participants reported an average of 12.7 hours of internet use per week with a standard deviation of 4.88. Rural participants reported an average of 9.8 hours of internet use per week with a standard deviation of 2.82. Using the data that was collected, the researcher found the following: The…arrow_forwardIn sociology, a personal network is defined as the people with whom you make frequent contact. A research program used a stratified random sample of men and women born between 1908 and 1937 to gauge the size of the personal network of older adults. Each adult in the sample was asked to "please name the people you have frequent contact with and who are also important to you." Based on the number of people named, the personal network size for each adult was determined. The responses of 2,821 adults in this sample yielded statistics on network size, that is, the mean number of people named per person was 14.3, with a standard deviation of 10.3. Complete parts a through c. a. Form a 95% confidence interval for the mean personal network size of all older adults.arrow_forwardA researcher is interested in examining whether the location that a person lives is related to the number of hours that they spend on the internet each week. The researcher collected data from a sample of 30 participants who were classified in one of three groups: (1) 10 people who live in an urban setting, (2) 10 people who live in a suburban setting, and (3) 10 people who live in a rural setting. Each participant reported the number of hours they spend on the internet in a typical week (the dependent variable). The researcher found the following descriptive statistics: Urban participants reported an average of 8.9 hours of internet use per week with a standard deviation of 2.77. Suburban participants reported an average of 12.7 hours of internet use per week with a standard deviation of 4.88. Rural participants reported an average of 9.8 hours of internet use per week with a standard deviation of 2.82. Using the data that was collected, the researcher found the following: The…arrow_forward
- Holt Mcdougal Larson Pre-algebra: Student Edition...AlgebraISBN:9780547587776Author:HOLT MCDOUGALPublisher:HOLT MCDOUGAL