A two to three week incubation period usually occurs between the inoculation of T pallidum and development of the lesion (the range of incubation period is reported as being 9-90 days). Local, non-tender lymphadenopathy is often associated with this lesion. Figure 3 â3 shows primary syphilis lesions on the penis.
Rejecting or failing to reject the null hypothesis. Let's return finally to the question of whether we reject or fail to reject the null hypothesis. If our statistical analysis shows that the significance level is below the cut-off value we have set (e.g., either 0.05 or 0.01), we reject the null hypothesis and accept the alternative hypothesis.
Null and Alternative Hypotheses. Tests of statistical significance all begin with a null and an alternative hypothesis. The null hypothesis is the statement of no effect or a statement of commonly accepted state of affairs. The alternative hypothesis is what we are attempting to prove.