Random testing hypotheses
Occurring without a pattern. Unpredictable. In statistics where each item has an equal probability of being selected. sampling is where each member of a population is equally likely to be selected. Possible methods include using a random number generator from a computer programme, rolling a number of dice or using the random number button on a scientific calculator.
Example
Jimmy has the following list of random numbers:
3 6 9 0 1 3 7 4 3 2 2 9 1 3 8 5 4 1 2 7
He wants to use them to choose four people from a list of 60. First he groups the numbers into pairs:
36 90 13 74 32 29 13 85 41 27
He then removes numbers greater than 60, any repeat numbers, and 00.
36 13 32 29 41 27
Finally, he selects the 36th, 13th, 32nd and 29th people on the list.
Question
Michael wants to select a sample of ten people from a list of 70. Using the random number function on a calculator he gets the following numbers:
Which numbers should he use to form his sample?
So the numbers he should use are:
31, 27, 35, 23, 01, 62, 25, 56, 39, 04