Koofers

Past Exam for STAT 400 - APPLIED PROB & STAT I at Maryland (UMD)

Exam Information

Material Type:Final
Professor:Staff
Class:STAT 400 - APPLIED PROB & STAT I
Subject:Statistics and Probability
University:University of Maryland
Term:Fall 1997
Keywords:
  • Central Limit Theorem
  • In/on/at a Place
  • The Independent
  • Following Problems
  • Response Time
  • Distribution
  • No Correlation
  • Law of Large Numbers
  • Random Variable
  • Random Sample
Login / Sign Up to View Document
Preview Page 1

Sample Document Text

STAT 400, Final Examination Dec. 18, 1997, Thur. 10:30 - 12:30 AM Show your work in each of the following problems. 1. (20%) Suppose the response time to a particular editing command of a computer time-sharing system is normally distributed with standard deviation cr = lEi millisec. (a) Construct a 90% confidence interval for the mean response time I-L based on a random sample of 25 response times with a sample average of 24.3. (b) Calculate the sample size n to ensure that the resulting 90% CI has a length 7. 2.(20%) Suppose the hardness of a certain alloy is normally distributed with mean I-L = 65 and standard deviation cr = 4.7. (a) A speciman is acceptable only if its harness exceeds 59. Compute the probability that a randomly chosen specimen has an acceptable hardness. (b) Derive the probability that eight or more of ten independently selected spel::imens have acceptable hardness? (Round off numberical values to the second decimal place.) 3.(20%) Let X be a random variable h...

Related Documents

Random Sample Notes
Concentrated Exam
The Independent Exam
The Independent Exam
Probabilities Exam
Either...or Exam
License Plate Exam
Following Values Notes
Either...or Exam
Unauthorized Exam
Unauthorized Exam
Available Components Exam
The Independent Exam
Provided That Exam
Independent Random Variables Exam
Provided That Exam
155, "/var/app/current/tmp/"