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Answer :
Final answer:
The number 1.64 is often used in statistics, specifically in a one-tailed Z-test for a 90% confidence interval. It's the Z-score that corresponds to the 90% confidence level in a one-tailed test, according to a standard z-table.
Explanation:
Without additional context, it's challenging to provide an exact definition for where '1.64' comes from. However, in the realm of statistics, the value 1.64 is significant, being a critical value in a one-tailed Z-test for a 90% confidence interval. When you look it up in a standard z-table, you'll find that approximately 90% of the data falls within -1.64 and +1.64 standard deviations from the mean in a normal distribution. In other words, usually, 1.64 is the Z-score that corresponds to the 90% confidence level in a one-tailed test.
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