Fa_11_Homework_4

# Fa_11_Homework_4 - Name(please print SANYA BAJAJ Email ID svb5283 Section 2 Homework 4 Fall 2011 YOU MUST SHOW WORK TO GET FULL CREDIT Due in class

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SANYA BAJAJ Email ID svb5283 Section 2 Homework 4 Fall 2011 YOU MUST SHOW WORK TO GET FULL CREDIT. Due in class on Friday, October 21, 2011 . Staple all pages together with the questions in the order given below. If you take any definitions/concepts directly from the packet, please cite the page number in the packet . Please sign the Academic Integrity Pledge below and turn it in with your homework. I affirm that I have neither given, received, nor witnessed unauthorized aid on this deliverable and have completed this work honestly and according to the professor’s guidelines. Signature 1. Define sampling distribution. A sampling distribution is a probability distribution which shows all possible sample results for a given sampling situation. Random samples are necessary for sampling distributions. Sampling distribution depends upon the sample size and the statistic being compared. (Course Packet Pg.98) 2. Define standard error. Standard error of the statistic is the standard deviation of the sampling distribution for that statistic. All standard errors are standard deviations but not visa verse. (course Packet Pg.100) 3. A random sample of size 64 is taken. The population mean is equal to 640 and the populations standard deviation is equal to 40. Calculate the standard error of the mean. We know Standard error of the mean= Standard deviation / square root of n. Here, standard deviation= 40 Population mean= 640 No. of samples= 64 Therefore Standard error= 40/8=5 4. An exam is given to 36 randomly selected individuals. The population mean score is 55 and the population standard deviation is equal to 8. Calculate the following probabilities: a. Probability that the sample mean is greater than 57.2. Z= (57.2-55)/(8/6)= 2.2/

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## This note was uploaded on 11/08/2011 for the course SCM 200 at Pennsylvania State University, University Park.

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Fa_11_Homework_4 - Name(please print SANYA BAJAJ Email ID svb5283 Section 2 Homework 4 Fall 2011 YOU MUST SHOW WORK TO GET FULL CREDIT Due in class

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