D772 practice test questions and correct answers scored a+

What is one example of a population from a research study - Correct Answers All American women under the age of 60 A pollster selects seven random marketing firms and conduct in person interviews about industry trends for all employees at those firms. What is the sampling method described in the situation? - Correct Answers Cluster Which group represents a placebo group? - Correct Answers In a study on heart medicine, those receiving a pill with no medical benefit Which study is a double blind experiment - Correct Answers Researchers studying the effect of caffeine on attention span administered caffeine filled pills and placebo pills to participants randomly assigned to each group. The pills are coded so that neither the patient nor the person administering the pill knows which kind it is. Which implication follows from using a non-representative sample - Correct Answers The sample produces data that is not similar to what would be obtained from the entire population Which example illustrates a potential convenience, sampling bias - Correct Answers While standing outside the local department of motor vehicles, a researcher stops people and ask them to fill out a survey about local entertainment options A survey given to teenagers about their driving habits, had a low return rate because many young drivers did not want to answer questions about this topic. What is illustrated in this scenario? - Correct Answers Non-response bias A researcher planted two maple trees and plain soil and two maple trees and fertilize soil. Each tree was given 20 ML of water and eight hours of sunlight each day. After four weeks, the trees and plain soil were 7% taller than the trees and fertilize soil. Is this result likely to be statistically significant? - Correct Answers No, because the sample size for the study was too small As sociologist is designing a study that can be used to test a hypothesis. What should sociologist avoid doing to prevent results that are potentially misleading? - Correct Answers Duplicating data to increase the sample size A company randomly chose 1000 customers for an experiment. For half of the customers, the company sent out regular marketing emails. For the other half, the company sent physical flyers. At the conclusion of the study, it was found that the customers who received physical flyers made more purchases than those who receive regular emails. Which conclusion is valid? - Correct Answers There is a casual relationship between the measured variables For each group of a set of plants, a scientist recorded whether the group was exposed to full sunlight, partial sunlight, or minimal sunlight. What is the correct classification of the collected data? - Correct Answers Categorical A gardener recorded the amount of rain and millimeters, for each day of the month of June What is the correct classification of the collected data? - Correct Answers Quantitative A sales person wants to compare the number of laptops sold for each of the top six brands What is an appropriate graphical display for this data? - Correct Answers Bar graph A college student is survey other students to determine their preference among three proposed elective courses. The student will record the major of each survey respondent, and which elective they preferred most. Which type of graphical display is appropriate to show the data? - Correct Answers Two-way table Six cards numbered one through six are shuffled, and a card is pulled to see if it is even. If the card is even, the person who pulled the card when a prize. Which term describes (2,4,6) for this situation - Correct Answers Event There are six cards in the set. They are color green, red, yellow, black, white, and gray. One card is pulled at random. and check to see if the result is a color that is not black, not white, not gray. If so, the person who pulled the card a prize. What is an outcome in this scenario? - Correct Answers Black A random experiment has ( A,BC,D,E,F,G) for a sample space What is an example of mutually exclusive events for this sample space - Correct Answers Event one is Vowel and event two is FG The sample space for a random experiment is (black, blue, gray, orange, pink, purple, red, yellow) What are the outcomes corresponding to the event " not.A" even if.A is (black, blue, orange, red, yellow) and event B is (blue, gray, orange, red) - Correct Answers Gray, pink, purple A deli offers four types of bread for sandwiches, white, wheat, multigrain, and rye. Based on past sales data, the probability that a customer orders, wheat bread.P(W) = 31% and the probability that a customer orders rye is P(R)=53% What is P(W and R) for a single sandwich - Correct Answers0% The expected value of guessing on a test question is 9.19 points Which interpretation is correct - Correct AnswersIf a student were to guess on many questions like this, they would score an average of about 9.19 points per question A player has a 25% chance of winning a game that cost four dollars to play. If the player wins, they receive their four dollars back plus the prize of.$x What is the value of X that will make this a fair game? - Correct Answers$12.00