Question

In order to assess the membership’s attitudes about a recent Supreme Court decision, a local bar
association selects a simple random sample of 100 lawyers from its membership list. Surveys are
delivered to the selected lawyers. Only 63 of the lawyers return their surveys, and 42 of those are
in favor of the Court’s decision.
Identify the appropriate response letter (at right) to each of the following variables:
Sampling frame _____
Sample size, n _____
Number of ‘successes’, np _____
Number of ‘failures’, n(1-p) _____
Variable of Interest _____
Statistic, phat _____
Parameter, p _____
Sampling method used _____

Note: A letter could be used more than once, or not used at all... ?

A. % of lawyers in favor of decision
B. 63 lawyers
C. 100 lawyers
D. 42 lawyers
E. 21 lawyers
F. 42 / 63 (66.7%)
G. 21 / 63 (33.3%)
H. Simple Random Sample (SRS)
I. Number of Supreme Court justices

Answer 1

In order to assess the membership’s attitudes about a recent Supreme Court decision, a local bar
association selects a simple random sample of 100 lawyers from its membership list. Surveys are
delivered to the selected lawyers. Only 63 of the lawyers return their surveys, and 42 of those are
in favor of the Court’s decision.
Identify the appropriate response letter (at right) to each of the following variables:
Sampling frame : C. 100 lawyers as a local bar
association selects a simple random sample of 100 lawyers from its membership list.

Sample size: B. 63 lawyers as Only 63 of the lawyers return their surveys,
Number of ‘successes’, np= D. 42 lawyers as 42 of those are in favor of the Court’s decision.
Number of ‘failures’, n(1-p)= E. 21 lawyers as (63 - 42) = 21 of those are not in favor of the Court’s decision.
Variable of Interest= A. % of lawyers in favor of decision
Statistic, phat = G. 21 / 63 (33.3%)
Parameter, p = F. 42 / 63 (66.7%)
Sampling method used H. Simple Random Sample (SRS) as it is mentioned a local bar
association selects a simple random sample of 100 lawyers from its membership list

Note: A letter could be used more than once, or not used at all... ?

I. Number of Supreme Court justices