चयनित प्रतिदर्श (sample) से प्राप्त सभी प्रेक्षित मापों या मानों के संग्रह को क्या कहा जाता है?

Which of the following statements about the null hypothesis (H0) is incorrect?

The area under the normal curve within mean ± 2σ covers approximately:

Arrange the following pairs of standard deviation (σ) and total number of samples (n) in decreasing order of their standard error (SE = σ√n): A. σ = 1.6, n = 16 B. σ = 1.5, n = 25 C. σ = 0.6, n = 36 D. σ = 1.4, n = 49 Choose the correct answer from the options given below: