In statistics we often want to compare a computed value to see whether it is less than or greater than 5%. This value is called the p-value. Suppose the calculator gives us that the p-value is 0.0413. Convert this value to a percent and decide how it compares to 5%.
We move the decimal 0.0413 two places to the right to get
We can now see that 4.13% is less than 5%.
(not for this section, but keeping for now until I work on the order of operations section)
The "z-score" is defined by:
Find the z-score rounded to one decimal place if:
We can put these numbers into the z-score formula and use a computer or calculator to get
Now round to one decimal place to get 4.3. Notice that if you rounded before you did the arithmetic, you would get exactly 5 which is very different. 4.3 is more accurate.