To be statistically significant,a difference must be large enough so that it would occur by chance in less than 5 experiments out of 100.

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This statement is correct. A significance level of 0.05 (or 5%) is often used in statistical hypothesis testing to determine if a difference between two groups or variables is statistically significant. This means that if the difference occurred by chance in less than 5 experiments out of 100, it is deemed statistically significant.

To Be Statistically Significant,a Difference Must Be Large Enough So