UPDATED MATH 225N WEEK 1 ASSIGNMENT STATISTICS QUESTIONS AND CORRECT ANSWERS

Week 1 assignment quiz statistics : 1. 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 2. 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. 3. 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 4. 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. 5. 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 6. 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