RANDOM SAMPLES. Another way to pick the 50 cars could be the use of a Random Number table.

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Presentation transcript:

RANDOM SAMPLES

Another way to pick the 50 cars could be the use of a Random Number table.

RANDOM SAMPLES Another way to pick the 50 cars could be the use of a Random Number table. I got the list of numbers below from a pre – generated random number table I found on the internet.

RANDOM SAMPLES Another way to pick the 50 cars could be the use of a Random Number table. I got the list of numbers below from a pre – generated random number table I found on the internet. Let’s just use the first six numbers in the list…

RANDOM SAMPLES Another way to pick the 50 cars could be the use of a Random Number table. I got the list of numbers below from a pre – generated random number table I found on the internet. Let’s just use the first six numbers in the list… You can decide the parameters for splitting up the numbers. I am going to go with groups of three…

RANDOM SAMPLES Another way to pick the 50 cars could be the use of a Random Number table. I got the list of numbers below from a pre – generated random number table I found on the internet. Let’s just use the first six numbers in the list… You can decide the parameters for splitting up the numbers. I am going to go with groups of three… To find 50 cars out of 500, I use the numbers between 001 and 500… 111 will be the first car075 will be the fourth cab 061 will be the second car100 will be the fifth car 376 will be the third carAnd so on until we get 50 cars…

RANDOM SAMPLES How to draw a random sample: 1. Number all members of the population sequentially

RANDOM SAMPLES How to draw a random sample: 1. Number all members of the population sequentially 2. Use a table, calculator, or computer to select random numbers from the numbers assigned to the population members.

RANDOM SAMPLES How to draw a random sample: 1. Number all members of the population sequentially 2. Use a table, calculator, or computer to select random numbers from the numbers assigned to the population members. 3. Create the sample by using population members with numbers corresponding to those randomly selected.

RANDOM SAMPLES Simulation – a numerical facsimile or representation of a real – world phenomenon. EXAMPLE : I want to test the hypothesis that the chance of getting heads when I flip a quarter 20 times is 50%.

RANDOM SAMPLES Simulation – a numerical facsimile or representation of a real – world phenomenon. EXAMPLE : I want to test the hypothesis that the chance of getting heads when I flip a quarter 20 times is 50%. Instead of having to actually flip the quarter, I am going to use a random number table to simulate the coin flips.

RANDOM SAMPLES Simulation – a numerical facsimile or representation of a real – world phenomenon. EXAMPLE : I want to test the hypothesis that the chance of getting heads when I flip a quarter 20 times is 50%. Instead of having to actually flip the quarter, I am going to use a random number table to simulate the coin flips. Here is a line from a random number table :

RANDOM SAMPLES Simulation – a numerical facsimile or representation of a real – world phenomenon. EXAMPLE : I want to test the hypothesis that the chance of getting heads when I flip a quarter 20 times is 50%. Instead of having to actually flip the quarter, I am going to use a random number table to simulate the coin flips. Here is a line from a random number table : If we let even = heads and odd = tails, we have simulated 20 coin flips.

RANDOM SAMPLES Simulation – a numerical facsimile or representation of a real – world phenomenon. EXAMPLE : I want to test the hypothesis that the chance of getting heads when I flip a quarter 20 times is 50%. Instead of having to actually flip the quarter, I am going to use a random number table to simulate the coin flips. Here is a line from a random number table : If we let even = heads and odd = tails, we have simulated 20 coin flips. Our results would be : TTHHH THHTT THHHT HTTHT

RANDOM SAMPLES Simulation – a numerical facsimile or representation of a real – world phenomenon. EXAMPLE : I want to test the hypothesis that the chance of getting heads when I flip a quarter 20 times is 50%. Instead of having to actually flip the quarter, I am going to use a random number table to simulate the coin flips. Here is a line from a random number table : If we let even = heads and odd = tails, we have simulated 20 coin flips. Our results would be : TTHHH THHTT THHHT HTTHT ** if you count the H’s, there are 10 !