please i need some help for quiz. i need to know how to fix my worksheet so i ca
ID: 3067998 • Letter: P
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please i need some help for quiz. i need to know how to fix my worksheet so i can have better grade thanks
Sampling Group Quiz 1 1. Use the numbers below to perform a simple random sample of 4 counties. Start at the left most digit and move across. Make your procedure clear so that someone can follow what you did. You must do this by marking directly on or above the table. 13 070BB932 /5702 b3993 996as 28753 .86% 40345 ) ad)76213 g2390 77412 Gi la laba pa Green be Codhise 2. At a certain university, students who live in the dormitories eat at a common dining hall. Recently, some students have been complaining about the quality of the for d served there. The dining hall manager decided to do a survey to estimate the proportion of students living in think that the quality of the food should be improved. One evening, the manager asked the first 100 students entering the dining hall to answer the following question. the dormitories who Many students believe that the food served in the dining hall needs improvement. Do you think that the quality of food served here needs improvement, even though that would increase the cost of the meal plan? No opinion Yes No (a) In this setting, explain how bias may have been introduced based on the way this convenience sample was selected and suggest how the sample could have been selected differently to avoid that bias. non respore and response bas non respone and response bias The sample could hove been se lected differently be that the quatty of food should or should Was using volunteerna Samp k mehod, whoever unls not Improve, thy wit Comu tu the manage e opinions 9 continued on next page 5Explanation / Answer
2a) The first 100 students who eat at the dining hall may have very different opinions than those that come later. It is likely that the food is fresher when the first 100 students arrive and it is likely that the first 100 students have a more positive attitude about the food as evidenced by the fact they are willing to arrive early. The bias could be avoided by assigning the dormitory students a number and then randomly selecting 100 students and ask for their opinions
2b) Bias is introduced by including the phrase, “Many students believe that the food served in the dining hall needs improvement” which could cause many students to go along with the norm and say yes rather than giving their own opinion. Bias is introduced by including the phrase, “even though that would increase the cost of the meal plan” a cost consideration is included and students may think the food is awful but are unwilling or unable to pay more for their meals. If they were wanting to know the opinion of the students about the food quality, the question could be worded “Do you think that the quality of food served here needs improvement?”
3a) Heads of households in the United States
3c) Stratified sampling should be used. Each state is a stratum. Within each state, a random sample of adult heads of households would be selected/surveyed. Thus, sub-groups will be different and the data will not overlap.
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