If a data set is normally distributed, what is the proportion of measurements you would expect to fall within
A) 100 B) 95 C) 68 D) 50
Question 2
Name and describe the kind of bias that might be present if the statistics teacher decides that instead of randomly selecting students to survey on how they feel about the course she just
a. asks students to volunteer for the survey.
b. gives the survey during class one day.
Management at a large retail chain is concerned about the possibility of drug abuse by people who work there. They decide to check on the extent of the problem by having a random sample of the employees undergo a drug test. Several plans for choosing the sample are proposed.
a. Randomly select ten stores around the country and survey all the employees that work at those stores.
b. Choose the fourth person that arrives to work for each shift.
c. There are four employee classifications: supervisors, fulltime clerks, part-time clerks, and maintenance staff. Randomly select ten people from each category.
d. Each employee has a three-digit identification number. Randomly choose 40 numbers.
The cladistic approach from molecular genetic data
Energy budget for a temperate deciduous forest (data from Gosz et al. 1978).
The nitrogen cycle. Numbers represent fluxes as 1012 g N per year (data from Schlesinger 1991, after
2006 Data:Top 25 Substances Involved in Human Exposures
A model of the 70S ribosome based upon early structural data
The Means and Extremes of a Proportion