Reducing Statistic bias

Beverly g The manager of a local bank wants information from his 1000 customers as to what would most improve their experience. One Saturday afternoon he asks every customer who comes into the bank the following question. Which would you prefer, that the bank stay open longer hours on the weekend or that additional services be offered on our online banking app? banking app. Of the 11 customers who come into the bank that Saturday afternoon, 9 say they prefer longer weekend hours and the rest say they prefer improving the (a) Identify and describe the most prominent source of bias in the manager's study. Choose the best answer from the choices below. X The bias comes from the fact that the customers were not allowed to voluntarily choose to be in the sample. Volunteers are more likely to have characteristics that reflect the population as a whole. The bias comes from the phrasing of the question and the context in which it is asked. The responses are unlikely to accurately reflect the customers' preferences. The bias comes from having too many of the customers who came into the bank not respond to the question. These customers might answer the question differently than those who did. O The bias comes from the sampling done in the study. The manager only asked customers who came into the bank that Saturday afternoon, making the sample a sample of convenience. O There is no or very little bias in the manager's study. The sample size is smaller than 30. Samples of this size are very unlikely to have outliers, meaning that the sample will have characteristics that reflect the population as a whole. (b) Describe something the manager could have done to reduce the most prominent source of bias in the study. Choose the best answer from the choices below. O Modify the study by asking the question to a random sample of the bank's customers instead of just the customers coming into the bank that Saturday afternoon. This way the sample is no longer a sample of convenience O Email the question to every customer in the bank's database and ask them to respond if they choose. This way the manager makes sure that the respondents are volunteers. O Change the phrasing of the question and make sure that the customers who came into the bank could answer the question anonymously. That way the customers' answers would be more likely to accurately reflect their preferences. O Offer a free pen to any customer who answers the question. This way the number of customers not answering the question would be decreased. O As the sample size is sufficiently small, the study has no or very little bias. So, there is nothing the manager needed to have done to reduce bias Check 4044 IVICGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy