MATH 225N Week 1 Assignment Statistics Questions And Answers Verified 100% Correct

MATH 225N Week 1 Assignment Statistics Questions And Answers Verified 100% Correct Week 1 assignment quiz statistics : 1. A consumer research company is interested in determining if a certain company's new refrigerator model is more efficient than the older model. What should the researchers do first? Correct answer: Write a claim about the efficiency of the new model that can be tested. 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 selected. Answer Explanation Correct answer: True 1. When is cluster sampling appropriate? Cluster sampling is a good choice when the population has multiple distinct groups that are each likely to be representative of the population as a whole. 2. William is studying the hair colors of all students attending his college. He collects data from the 25 students in his statistics class. Which type of sampling is used? Ans : Convenience sampling 3. When is stratified sampling appropriate? Correct answer: Stratified sampling is a good choice when the population has multiple distinct groups that are internally homogenous but not representative of the population as a whole. 4. Assume that 80 houses are present in the form of a grid consisting of 10 columns and 8 rows. 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? Correct answer: Stratified Sampling using the rows of the houses as strata 5. In the description of the following experiment, determine the experimental factor. During a study testing a new vaccine drug for Zika virus, the research team grouped the volunteers enrolled for the test into Group A and Group B. Group A received an inert drug (placebo) while Group B received the vaccine drug. Correct answer: the drug received by each group 6. A biologist is interested in finding the relationship between the amount of sunlight and the growth rate of sunflowers. Would an experimental or observational study design be more appropriate? Correct answer: An experimental study should be used with the amount of sunlight as the controlled factor.