Question

Identify the parameter, Part II. For each of the following situations, state whether the parameter of interest is a mean or a proportion.

1. (a) A poll shows that 64% of Americans personally worry a great deal about federal spending and the budget deficit.

2. (b) 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. (c) In a survey, high school and college students are asked whether or not they use geolocation services on their smart phones.

4. (d) In a survey, internet users are asked whether or not they purchased any Groupon coupons.

5. (e) In a survey, internet users are asked how many Groupon coupons they purchased over the last

   year.

Answer 1

1)

The parameter of interest is proportion. Since, the proportion of Americans personally worry a great deal about federal spending and the budget deficit.

2)

The parameter of interest is mean. Since, each TV news program and newspaper report the number that is revenue.

3)

Each student reports whether or not they use geolocation services on their smart phones, so this is a categorical variable and we use a proportion.

4)

The parameter of interest is proportion. Since, the users \(\underline{\text { says }}\) or not purchases the group on coupons.

5)

The parameter of interest is mean. Since, we compare the number of uses purchased group on coupons over the last year to present year.