T-Score vs. Z-Score | t table and z table
Youmaywanttoreadthesearticlesfirst:Whatisat-statistic?Whatisaz-score?[1][2]T-Scorevs.Z-Score:OverviewWatchthevideoforanoverviewofwhentouseat-scoreandwhentouseaz-score:Can’tseethevideo?Clickhere.[3]Az-score[4]andatscore[5]arebothusedinhypothesistesting[6].Fewtopicsinelementarystatistics[7]causemoreconfusiontostudentsthandecidingwhentousethez-scoreandwhentousethetscore.Generally,inelementarystatsandAPstats[8],you’lluseaz-scoreintestingmoreoftenthanatscore.T-scorevs.z-score:WhentouseatscoreTheg...
You may want to read these articles first:What is a t-statistic?What is a z-score?[1][2]
T-Score vs. Z-Score: OverviewWatch the video for an overview of when to use a t-score and when to use a z-score:
Can’t see the video? Click here.[3]A z-score[4] and a t score[5] are both used in hypothesis testing[6]. Few topics in elementary statistics [7]cause more confusion to students than deciding when to use the z-score and when to use the t score. Generally, in elementary stats and AP stats[8], you’ll use a z-score in testing more often than a t score.
T-score vs. z-score: When to use a t scoreThe general rule of thumb for when to use a t score [9]is when your sample:
You must know the standard deviation of the population and your sample size should be above 30 in order for you to be able to use the z-score. Otherwise, use the t-score.When to use a t-score vs. z-score.
The above chart is based on (from my experience), the “rule” you’re most likely to ...