Koofers

Past Exam for STAT 100 - ELEM STAT & PROB at Maryland (UMD)

Exam Information

Material Type:Exam 3
Professor:Staff
Class:STAT 100 - ELEM STAT & PROB
Subject:Statistics and Probability
University:University of Maryland
Term:Spring 2003
Keywords:
  • Make-to-Order
  • Assumptions
  • Combinations
  • Homogeneity
  • Independence
  • Following Steps
  • Probabilities
  • Expected Values
  • Large Sample
  • Average Number
Login / Sign Up to View Document
Preview Page 1Preview Page 2

Sample Document Text

Stat 100 Exam 3 B Spring 2003 Calclllators allowed. Allwork must be shown to receive full credit. 1. Birth weights of infants are normally distributed with a mean of7.5 pounds and standard deviation.9 pounds. Based on this data: a) (8 pts) find a 90% error margin for the mean weight of infants b) (8 pts) find a 95% confidence interval for the mean weight. c) (9 pts) If the standard deviation is 1 pound, what sample size is required so that a 98% error margin is .2 pounds? 2. To estimate the proportion of car owners who purchase more than $1,000,000 of liability coverage for their vehicles, a random sample of 400 car owners is taken, of which 56 have this coverage. Does this support the claim that the proportion is less than 15%? Test the claim at the 5% level by the following steps. a) (6 pts) Formulate the null and alternative hypotheses. b) (6 pts) Determine the rejection region. c) (6 pts) Determine the observed value of the test statistic. d) (7 pts) State your conclusion...

Related Documents

Credit Card Exam
Significance Exam
Combinations Exam
Combinations Exam
Concentrated Exam
Approximation Exam
Standard Deviation Exam
Assumptions Exam
Probabilities Exam
Either...or Exam
Either...or Exam
Independence Exam
Assumptions Exam
New Interval Exam
Random Sample Notes
Assumptions Exam
155, "/var/app/current/tmp/"