MATH 225N week 1 sampling questions 2020

Assume that 80houses are present in the form of a grid consisting of 10 columns and 8 If a loud speaker is placed just before the first row, which sampling method works the best to select a sample of houses if we … want ...

Assume that 80houses are present in the form of a grid consisting of 10 columns and 8 If a loud speaker is placed just before the first row, which sampling method works the best to select a sample of houses if we … want to get an estimate of the average loudness (measured in decibels) near all the 80 houses? Angela is studying the mean blood pressure of all students attending her college. She collects data from the … 38students in her statistics class. Which type of sampling is used? A town planner is interested in getting some demographic data about the households in the city. The city has four wards with the … following numbers of households: ward A has 2,107, ward B has 903, ward C has 1,505, and ward D has 1,499. The budget for the project allows the planner to survey 100 She plans to use a stratified sampling method. What number of households should be chosen from ward B? Enter a whole number. Donald is studying the eating habits of all students attending his school. He samples the population by dividing the students into … groups by grade level and randomly selecting a proportionate number of students from each group. He then collects data from the sample. Which type of sampling is used? An executive for a large national restaurant chain with multiple locations in each of 513counties wants to personally sample the … cleanliness of the chain’s restaurants throughout the country by visiting restaurants. The executive wants a good-quality sample but wants to minimize travel time and expenses. Which of the following sampling methods would be most appropriate? considering different sampling methods, stratified sampling includes the steps: _______. When is using a simple random sample appropriate? Ruby is studying the mean waist size of all students attending her college. She collects data from the 25students in her statistics class. Which type of sampling is used? A school district’s superintendent wants to administer a test of life skills to a sample of students. The superintendent has ample time and resources to conduct the study, as well as access to detailed information about all … students’ addresses, courses, grades, and attendance. Which of the following would be the worst sampling method for the superintendent to use? In reference to different sampling methods, cluster sampling includes the steps: use simple random sampling to select a set of groups; every individual in the … chosen groups is included in the sample. A television station plans to send a crew to a polling center on an election day. Because they do not have time to … interview each individual voter, they decide to count voters leaving the polling location and ask every 20th voter for an interview. What type of sampling is this? William is studying the hair colors of all students attending his college. He collects data from the 25students in his … statistics class. Which type of sampling is … ? A manufacturer has three tool centers that each make about 1000tools every day. In order to implement better quality-control procedures, the manager wants to start sampling the tools made each day to be … able to identify issues as quickly as possible. Which sampling method would be most appropriate? To study the eating habits of all athletes in his school, Christopher obtains a list of the athletes and collects data from every 10th person … on the list. Which type of sampling is … ? A grocer receives cartons of 12eggs in boxes of 100 In a particular month, the grocer receives 4 shipments of eggs with 20 boxes in each shipment. The grocer wants to estimate the proportion of … cartons he receives this month that include at least one broken egg. Which of the following sampling methods would be most appropriate? To study the mean head size of all athletes in his school, Kenneth obtains a list of the athletes and collects data from every 6th person … on the list. Which type of sampling is … ? A professor is … in the average length of books in her library. She has divided her books into a few different categories: 235books on mathematics, 290 books on sports, and 166 books on interior design. Rather than … examining all the books, she plans to use a stratified sample of 50 How many of the sports books should she choose? Enter a whole number. Tina is studying the shoe sizes of all students attending her university. She samples the student population by selecting every 18th student from an … alphabetical list of the students. Which type of sampling is … ? The management of a large airline wants to estimate the average time after takeoff taken before the crew begins serving snacks and … beverages on their flights. Assuming that management has easy access to all of the information that would … to select flights by each proposed method, which of the following would be reasonable methods of stratified sampling? Select all that apply. When considering different sampling methods, systematic sampling includes the steps: _______. A television station wants to report on a local election. The station has three crews that can … used during the day … for collecting data. What sampling method would be appropriate? In reference to different sampling methods, systematic sampling includes the steps: list the members of the population; use simple random sampling to select a starting point in the … population; let k= (number of individuals in the population)/(number of individuals needed in the sample); choose every kth individual in the list starting with the one that was randomly … A town planner is … in getting some demographic data about the households in the city. The city has ten wards that … vary in size. Which sampling method is most appropriate? When considering different sampling methods, cluster sampling includes the steps: _______. A quality manager at a manufacturing plant needs to get a sample of widgets for monitoring the manufacturing processes. He plans to choose one out of every Nwidgets produced. The plant makes … about 5100 widgets per day, and the quality team has enough time to examine about 60 widgets each day. What value should the manager use for N? Enter a whole number.5100/60 = 85 Cluster sampling includes the steps: divide the population into groups; use simple random sampling to identify a proportionate number of individuals from each group. A quality-assurance worker wants to … systematically sample 120glass jars each day from a conveyor belt in a factory that puts out 3,600 jars each day. If the worker will select every kth jar, what is the best value of k for the worker to use? Enter a whole number.3600/120 = 30 In order to study the mean pulse rate of people in his town, Jerry samples the population by dividing the residents by regions and … randomly selecting 12of the regions. He collects data from all