Question

Explain the aim of using the ? table. How can we use and read the ? table ? Draw the graphical part of the table and explain generally.

Answer 1

Answer:-

Aim of using Z- table-

The z-table is short for the “Standard Normal z-table”. The Standard Normal model is used in hypothesis testing, including tests on proportions and on the difference between two means. The area under the whole of a normal distribution curve is 1, or 100 percent. The z-table helps by telling us what percentage is under the curve at any particular point.

Method of use and read z-table-

To find a specific area under a normal curve, find the z-score of the data value and use a Z-Score Table to find the area. A Z-Score Table, is a table that shows the percentage of values (or area percentage) to the left of a given z-score on a standard normal distribution.

For example to find the value of P(z 0.55) ,we see vertically for z=0.5 and horizontally for z=0.05 and from table it is 0.7088.

See below