COMM 217 Final: Review_Problems-final copy.pdf
26 Jan 2015
School
Department
Course
Professor
Document Summary
Sampling distributions: the size of servings of soft ice cream in a fast-food chain is monitored carefully so that the mean serving is 250g, with a standard deviation of only 7. 5g. Treat the weights as being normally distributed: inspectors select 20 servings at random, and weigh them. What is the probability that the mean time is between 20 and 23 minutes: the inspections at acme reveal that 8% of the transistors (in the above problem) are defective. What is the standard error of the proportion of defectives: based on past experience, 25% of the contacts made by a firm"s sales representatives result in a sale being made. Jane has contacted 100 potential customers, but has made only 15 sales. Jane"s contacts represent a simple random sample of those who could have been called upon. Explain: seventy percent of the registered voters in a large community are members of the progressive.
