Researchers use a one-sided hypothesis when the direction of the effect is thought to be known
With a one-sided hypothesis, the alpha level of level of significance exists wholly on one side of the distribution. An alpha value of .05 is still used and beta values of .20 are normally accepted to meet statistical power for these types of hypotheses.
Statistician Services for Students
Eric Heidel, Ph.D. will provide the following services for undergraduate and graduate students at $50/hour. Secure checkout is available with Stripe or PayPal.
- Statistical Analysis
- Research Design
- Sample Size Calculations
- Diagnostic Testing and Epidemiological Calculations
- Survey Design and Psychometrics
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