Hypotheses are scientific falsifiable statements
The research hypothesis can be one-directional or one tailed, as in
there is a directional relationship between populations. It can be
non-directional or two tailed hypothesis
Research hypotheses are tested by trying to disprove their
respective null hypotheses by providing quantitative evidence, through
The rationale behind setting the level of statistical significance
at P<0.5 has to do with what the scientific community perceives as
acceptable level of error occurrence
One major pitfall of NHST is that it’s not comparable and
cumulative, whereas scientific research is
Bruin, J. (2006). Institute for digital research and education . Retrieved from University of Califirnia Los Angeles : https://stats.idre.ucla.edu/other/mult-pkg/faq/general/faq-what-are-the-differences-between-one-tailed-and-two-tailed-tests/
Chung, M. C., & Hyland, M. E. (2012). Evaluation of the idea that psychology is a science: what is science ? In M. C. Chung, & M. E. Hyland, History and Philosophy of Psychology (pp. 76 - 79). West Sussex: John Wiley & Sons Incorporated.
Cohen, J. (1994). The earth is round (p <.05). American Psychologist , 997- 1003.
Dahiru, T. (2008). P – value, a true test of statistical significance? A cautionary note. Ann Ib Postgraduate Med, 21-26.
Dancey, C., & Reidy, J. (2017). Hypothesis testing and statistical significance . In Statistics Without Maths for Psychology (7th ed.) (pp. 134-173). Harlow, UK: Pearson.
Minitab . (2017). What are inferential statistics ? Retrieved from Minitab: https://support.minitab.com/en-us/minitab-express/1/help-and-how-to/basic-statistics/inference/supporting-topics/basics/what-are-inferential-statistics/
Minitab. (2017). What are type I and type II errors? . Retrieved from Minitab: https://support.minitab.com/en-us/minitab-express/1/help-and-how-to/basic-statistics/inference/supporting-topics/basics/type-i-and-type-ii-error/
SJSU. (2016, May 8). Introduction to null hypothesis significance testing. Retrieved from San Jose State University: http://www.sjsu.edu/faculty/gerstman/StatPrimer/hyp-test.pdf