F-test
given by fisher 1920
also known as variance ratio test.
☑️f-test always positive.
☑️small sample test.
☑️f-test value lies between 0 to infinite.
☑️also called test of overall significance of regression.
☑️it is a basis of Anova.
☑️Anova-analysis of variance.
☑️degree of freedom.
Z-test
Z-test given by fisher-1913
This is large sample test=n>30
We can avoid degree of freedom
2- tail test
less peak (kurtosis)- platykurtic curve
z test applicable where population correlation coefficient is not zero, than z test is used
to check to population mean difference
1- if calculated value< table value then H° accept
2-if calculated value >table value then H° reject
this is short note on z test it is important to all competitive exam like economics net KVS PGT economics NVS PGT economics DSSSB PGT economics also for assistant professor economics this is very important topic for who prepare for these exams frequently asked question from this test z test
Statistical Economics
T-test
👉t test given by William gossett
Also known as
1-student t-test
2-watch t-test
Introduction:- t test study of population and sample mean
deviation from population parameter
standard error
Application
1-small sample test (n<30) but n- greater than t-test normal looking curve meso kurtik.
2-standard deviation is unknown and variance is unknow.
3-when population increase correlation=0, normal distribution.
4-two tailed test, normal curve, less peak.
this is short note on z test it is important to all competitive exam like economics net KVS PGT economics NVS PGT economics DSSSB PGT economics also for assistant professor economics this is very important topic for who prepare for these exams frequently asked question from this test z test
Statistical Economics
Chi square test
Also known as
1-test of goodness of fit
2-test of independence
3-test of homogeneity
4-test of population variance
Some important key point frequently
ask in exams👇
-☑️value value from 0 to 1
-☑️large sample test N>50
☑️applicable on qualitative data
☑️parametric and nonparametric
☑️this is one tailed and two tailed test both
☑️positive skewed
☑️degree of freedom (d.f)=n-k
important formulas
1-mean=d.f
2-variance=2×d.f
3-mode=d.f-2
4-B1[bita]=√2/d.f
this is short note on z test it is important to all competitive exam like economics net KVS PGT economics NVS PGT economics DSSSB PGT economics also for assistant professor economics this is very important topic for who prepare for these exams frequently asked question from this test z test
