Exercise 1 For each of the following situations, state whether the parameter of
ID: 3313206 • Letter: E
Question
Exercise 1 For each of the following situations, state whether the parameter of interest is a mean or a proportion I. A poll shows that 64% of Americans personally worry a great deal about federal spend- ing and the budget deficit. 2. A survey reports that local TV news has shown a 17% increase in revenue between 2009 and 2011 while newspaper revenues decreased by 6.4% during this time period 3. In a survey, high school and college students are asked whether or not they use geoloca- tion services on their smart phones. 4. In a survey, smart phone users are asked whether or not they use a web-based taxi ser- 5. In a survey, smart phone users are asked how many times they used a web-based taxi service over the last yearExplanation / Answer
a) Here, we are trying to study the parameter: the proportion of Americans who personally worry a great deal about federal spending and budet deficit. Therefore here the parameter of interest is proportion
b) Here the parameter of interest is the revenue which is not a proportion but a numerical quantity and we are trying to study the increase in mean levels and similar quantities like those. Therefore here the parameter of interest is Mean.
c) Here we are doing the study of a binary variable where there could be only 2 choices. The parameter here would be the proportion of students who use geological services on their smart phones. Therefore here the parameter of interest is proportion
d) Here again like the last part, the variable studied is a binary variable. Therefore here the parameter of interest is proportion
e) The number of time a web-based taxi service over the last year is a numerical quantity and therefore is not a proportion but the mean value of the number of times would be studied. Therefore here the parameter of interest is Mean.
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