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So, you want to know the difference between validity and reliability? Okay.....
Let's suppose you want to buy an item from this store. The clerk would use a scanner to determine the price of the item because it is the appropriate instrument to determine the cost. They wouldn't use a hairbrush to determine the cost, would they?
You could say that the instrument used to measure or determine the cost of the item is a 'valid' instrument to use for this task. In other words, the scanner does what it is designed to do.
So, the scanner may be the correct instrument to use for finding the price, but can I count on it to give me the correct price each time?
What if several clerks scan the item, on the same scanner, and got the same price? Well, I could say the scanner is reliable, in that it gives consistent results.
That's the difference between validity and reliability.
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