MATH 225N- week 1 sampling questions and answers-graded A

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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 4. 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? Select the correct answer below: Systematic sampling Convenience sampling Stratified sampling Cluster sampling 5. An executive for a large national restaurant chain with multiple locations in each of 513 counties 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? CONTINUED........ [Show More]

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