Tabel Z Normal

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tabel z normal

Understanding the Z-Score Table

The Z-Score table, also known as the standard normal distribution table, is an essential tool in statistics. It provides the cumulative probability associated with a Z-score in a standard normal distribution. The Z-score represents the number of standard deviations a data point is from the mean. By using this table, statisticians can determine the probability of a value occurring within a given range.

Basics of the Z-Score Table

The Z-Score table is divided into two main parts: the positive Z-scores and the negative Z-scores. Each Z-score corresponds to a specific area under the normal curve. The table helps in finding the probability that a given score lies below a certain value. For example, a Z-score of 1.0 indicates that the score is one standard deviation above the mean, and the table can tell us what percentage of the data falls below this point.

How to Read the Table

To use the Z-Score table, first, find the Z-score value in the leftmost column. Then, move across the row to the correct column to find the cumulative probability. For example, a Z-score of 1.96 corresponds to a probability of approximately 0.9750, indicating that 97.50% of the data lies below this value.

Applications in Statistics

The Z-Score table is widely used in various statistical analyses, including hypothesis testing and confidence intervals. It helps in determining the likelihood of a data point occurring and is crucial for making data-driven decisions in fields like finance, research, and quality control.

In conclusion, the Z-Score table is a fundamental resource in statistics for understanding data distribution. Mastery of this table allows for accurate probability assessments and informed decision-making.

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