In each of the following situations determine the type of sampling (simple random sample, cluster sample, stratified sample, convenient sample or systematic sample) that was used. Be able to give an explanation. 1. A marketing research firm is trying to determine the effectiveness of an advertising campaign. They have sponsored a series of television ads for a new cleaning product which have run in a major city. They plan a survey by dividing the city according to the squares on a transportation road map. They take a simple random sample of the squares on the map. For each square chosen they send an employee out to go to each house in the square with their questionnaire. They are able to complete a total of 345 questionnaires. One of the questions asked, "Have you heard of Wonder detergent?" and another asked "How many times during the week do you visit the grocery store?" Stratified Sample - Entire city divided into squares and then squares picked by simple random sample. 2. Zooms produces computer games. The quality control department of Zooms has a procedure to inspect its games. During the first hour of production the manager picks a random value between 1 and 60. If the number is 35 then at exactly thirty five minutes past the hour, for that hour and for every other hour after that during that day, she sends her assistant to pull a copy of the software game program from the assembly line. The programs pulled will get put through a complete testing process. Simple Random Sample - 3. The Franklin University Student Advisory Committee is trying to determine how much students spend on average for books each term. Each of the six members of the committee randomly chooses five friends and asks the friend to determine how much was spent on books for that term. Simple Random Sample - The six member of the committee randomly chooses five friends. 4. A small company was trying to determine the amount of the average order for parts. It had received over 1000 orders for parts. The office manager had the computer select 35 of those orders randomly. He determined that the mean amount of these 35 orders was $389.45. One of the orders was for $350 in miscellaneous cables. He informed his boss that he was 95% certain that the average order that they had received was between $337.97 and $441.03 Systematic Sampling - 5. A hospital is trying to improve its patient services. The hospital administrator randomly chooses one nurse from each floor of the hospital to serve on a fact committee. The nurses are asked (among other things) to keep track of how many patients they visit during each hour of the day on the nurses' daytime shifts. At the end of a month the administrator collects the information and concluded that the nurses see an average of 22 patients per hour. (Although the values ranged from 53 to 6 patients per hour. Based on this information the administrator reports that the average number of patients visited per hour by all nurses is 20. Systematic Sampling