Well, darling, it looks like the data on the graph clearly shows a positive correlation between the number of hours spent studying and exam scores. So, it's safe to say that putting in the time to hit the books is paying off in those A+ grades. Keep up the good work, smarty pants!
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A valid conclusion is when your conclusion is written using the text you have and get it right.
What conclusion can be reached by the data shown on the graph?
Providing of course that a sample is representative of the population from which it is drawn, the bigger it is the more likely it will be to lead to a valid conclusion. Therefore, the best sample size when there are no restrictions, as in this case, would be one of 1000.
A continuous graph.
an origin can not be drawn because its (0,0) the middle of the graph