## Tools for Thought |

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Page 135

Suppose you took one sample, say, of n individuals, and worked out an

of the population average and standard deviations from that; and then took

another similar sample, and another, and another, and worked out

...

Suppose you took one sample, say, of n individuals, and worked out an

**estimate**of the population average and standard deviations from that; and then took

another similar sample, and another, and another, and worked out

**estimates**from...

Page 136

But an average based on a sample should always be given as a number

followed by an

minus another number which gives what I referred to above as the

'standard ...

But an average based on a sample should always be given as a number

followed by an

**estimate**of its reliability, which is normally written as plus-or-minus another number which gives what I referred to above as the

**estimate**of the'standard ...

Page 137

As a very rough rule of thumb, one can say that if we are presented with two

the same five-year period, of the percentage of students entering the Faculties of

...

As a very rough rule of thumb, one can say that if we are presented with two

**estimates**of something, each with their probable error (say, the averages, overthe same five-year period, of the percentage of students entering the Faculties of

...

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