AGRC1023 Lecture Notes - Lecture 8: Statistical Hypothesis Testing, Null Hypothesis, Test Statistic
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This states there is no significant difference between specified populations. Observed differences are considered due to sampling or experimental error. Sample observations are influenced by some non- random cause. Evidences that there are differences between treatments of interest at least one mean is different o o. If the p-value is equal to or smaller than 0. 05, the result is significant, so you should reject the null hypothesis o. Any statistical hypothesis test in which test statistic follows t- distribution if null hypothesis supported. To calculate the t value, you need to know: the sample size (n), as you need to work out the degrees of freedom (df = n 1) freedom (df = n 1) The level of probability setting for reliability (e. g. confidence interval) Commonly used when variances of 2 normal distributions unknown. The probability of experimental results being completely due to the natural variation in experimental objects and conditions.
