MATH 225N WEEK 1 ASSIGNMENT SAMPLING METHODS – QUESTIONS AND ANSWERS

MATH 225N WEEK 1 ASSIGNMENT SAMPLING METHODS – QUESTIONS AND ANSWERS Questions 1. 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? ________________________________________ Select the correct answer below: ________________________________________ Simple Random Sampling Stratified Sampling using the rows of the houses as strata Cluster Sampling using the rows of the houses as clusters Convenience Sampling 2. Angela is studying the mean blood pressure of all students attending her college. She collects data from the 38 students in her statistics class. Which type of sampling is used? ________________________________________ Select the correct answer below: ________________________________________ Cluster sampling Stratified sampling Systematic sampling Convenience sampling 3. 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 households. She plans to use a stratified sampling method. What number of households should be chosen from ward B? Enter a whole number. 903/2107+903+1505+1499 = 903/6014 x 100 = 15