(b) A firm is interested in estimating the average per capita income in a certain city. There is not an available list of resident adults. The city is marked off into rectangular blocks. The researchers decide that each of the city blocks will be considered a cluster. The clusters are numbered from 1 to 10 and there is budget for sampling n = 4 clusters and to interview every household within each cluster. Information obtained from the sampled clusters is given below: Number of residents per cluster | 55 | 63 | 58 | 70 Total income per cluster | 2210 | 2430 | 2370 | 2880 i. Give an unbiased estimate of the population total. ii. Estimate the standard error of that estimator.
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A survey was conducted to collect demographic data from respondents. They were asked to categorize their annual incomes (in thousands of dollars) into the groups shown in the table to the right. The number of respondents for each income group is also provided in the table. Income Number of Respondents $20 to under $30 61 $30 to under $40 113 $40 to under $50 126 $50 to under $60 27 $60 to under $70 36 Complete parts a) and b): a) Calculate the approximate average income of the respondents. The approximate average income of the respondents is $ 41.3 thousand. (Round to one decimal place as needed.) b) Calculate the approximate variance and standard deviation of the incomes of the respondents. The approximate variance of the incomes of the respondents is thousand. (Round to two decimal places as needed.)
David N.
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