Response rates to Web surveys are typically low, partially d…

Response rates to Web surveys are typically low, partially due to users starting but not finishing the survey. The factors that influence response rates were investigated in a designed study. Web users were directed to participate in one of two surveys with different formats. One format utilized a welcome screen with a white background and another format utilized a welcome screen with a red background. The following ‘break-off rates’, i.e., the proportion of sampled users who break off the survey before completing all questions were computed:White Welcome Scree ‘break-off rate’  = p1-hat = 0.258 based on 49 users who broke-off survey out of 190 Web users Red Welcome Scree ‘break-off rate’  = p2-hat = 0.202 based on 37 users who broke-off survey out of 183 Web users Find the 95% Confidence Interval for the true difference in population proportions, p1-p2, and use this information to determine whether there is statistically significant difference in ‘break-off rates’ based on the two different background colors

Financial institutions have a legal and social responsibilit…

Financial institutions have a legal and social responsibility to serve all communities. Do banks adequately serve both inner-city and suburban neighborhoods, both poor and wealthy communities? In New Jersey, banks have been charged with withdrawing from urban areas with a high percentage of minorities. To examine this charge, a regional New Jersey newspaper compiled county-by-county data on the number of people per bank branch (y) and the percentage of the population in each county that is minority (x).  A simple linear regression model y  =  βo + β1 x + ε was fitted using JMP. Find the 99% Confidence Interval for Beta1. What does this confidence interval indicate about the overall usefulness of the regression model?