January 2017
Beginner
882 pages
203h 41m
English
1.796
2.571
2.977
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: – 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]
Population: shoppers at supermarket
Sample: those who returned the form
Parameter: p – population proportion who find shopping more pleasing
Statistic: – proportion who return the form that find shopping more pleasing (250/325)
Issues: Voluntary response. The sample may be biased.
Population: visitors to Web site
Sample: those who fill in the questionnaire
Parameter: μ – average ...