Z-test


0

Z-test

Z-test is based on the normal probability distribution and is used for judging the significance of several statistical measures, particular­ly the mean. The relevant test statistic, z, is worked out and com­pared with its probable value (to be read from table showing area under normal curve) at a specified level of significance for judging the significance of the measure concerned. This is a most frequently used test in research studies. This test is used even when binomial distribution or t-distribution is applicable on the presumption that such a distribution tends to approximate normal distribution as‘n’becomes larger z-test is generally used for comparing the mean of a sample to some hypothesized mean for the population in case of large sample, or when population variance is known. Z-test is also used for judging the significance of difference between means of two-independent samples in case of large samples, or when population variance is known. Z-test is also used for comparing the sample proportion to a theoretical value of population proportion or for judging the difference in proportions of two independent samples when ‘n’ happens to be large. Besides, this test may be used for

judg­ing the significance of median, mode, coefficient of correlation and several other measures.

 


Like it? Share with your friends!

0
BMS Team

We, at BMS.co.in, believe in sharing knowledge and giving quality information to our BMS students. We are here to provide and update you with every details required by you BMSites! If you want to join us, please mail to [email protected]

34 Comments

Facebook comments:

Choose A Format
Personality quiz
Series of questions that intends to reveal something about the personality
Trivia quiz
Series of questions with right and wrong answers that intends to check knowledge
Poll
Voting to make decisions or determine opinions
Story
Formatted Text with Embeds and Visuals
List
The Classic Internet Listicles
Countdown
The Classic Internet Countdowns
Open List
Submit your own item and vote up for the best submission
Ranked List
Upvote or downvote to decide the best list item
Meme
Upload your own images to make custom memes
Video
Youtube, Vimeo or Vine Embeds
Audio
Soundcloud or Mixcloud Embeds
Image
Photo or GIF
Gif
GIF format