# Is a higher Z score better?

## Is a higher Z score better?

The higher Z-score indicates that Jane is further above the Mean than John. fairly small while others are quite large, but the method of ranking is the same. An 80 Percentile means that 80% of the data elements are below that point.

## What is the z value of 99%?

Statistics For Dummies, 2nd EditionConfidence Levelz*– value90%1.6495%1.9698%2.3399%2.582

## What is Z for a 99 confidence interval?

Area in TailsConfidence LevelArea between 0 and z-scorez-score90%0.%0.%0.%0.

## Why is Z 1.96 at 95 confidence?

1.96 is used because the 95% confidence interval has only 2.5% on each side. The probability for a z score below −1.96 is 2.5%, and similarly for a z score above +1.96; added together this is 5%. 1.64 would be correct for a 90% confidence interval, as the two sides (5% each) add up to 10%.

## What is the Z critical value when using a 0.05 p value?

For example, in an upper tailed Z test, if α =0.05 then the critical value is Z=1.645.