Statistics for Business: Decision Making and Analysis, 3rd Edition

You Do It

1. 35.

   1. 1.796

   2. 2.571

   3. 2.977

2. 37.

   1. • Population: cars serviced at this dealership Sample: cars serviced during the time of the observations

      • Parameter: p – proportion of all cars with these dents

      • Statistic: $\widehat{p}$ – proportion seen with these dents (25.3\%)

      • Issues: The sample is small, and the context suggests it may not be representative.

      • Interval: [0.162, 0.344]

   2. • Population: shoppers at supermarket

      • Sample: those who returned the form

      • Parameter: p – population proportion who find shopping more pleasing

      • Statistic: $\widehat{p}$ – proportion who return the form that find shopping more pleasing (250/325)

      • Issues: Voluntary response. The sample may be biased.

   3. • Population: visitors to Web site

      • Sample: those who fill in the questionnaire

      • Parameter: μ – average ...