Tutor profile: Christopher O.
What's the present verb tense in Spanish?
For -ar verbs, it's I = o, you informal = as, he/she/it = a, we = amons, you plural = ais, they = an For -er verbs, it's you informal = es, he/she/it = e, we = emos, you plural = eis, they = en For -ir verbs, it's we = imons, you plural = is
Subject: Public Health
What are the epidemiological designs and their differences
There are 3 design methods: intervention, cohort, and case-control. In intervention design, you compare two groups: the one participating in the intervention (which could be a program, drug, behavior) and those not participating in the intervention. Those participating are called the treatment group, while those not participating are called the control group. In cohort, you are following a cohort (a group) for a period of time to determine disease-exposure association. You start with the exposure and then the disease (e.g., smoking probably causes lung cancer). Case-control and cohort are opposites. In case-control, you start with the disease and determine exposure (e.g., zika is caused by physical contact). Cohort is long-term exposure such as chronic diseases, while case-control is communicable diseases
How do I do a t-test for a dependent sample?
1) Have data from a pre- and post-test with the same participants 2) State the null and research/alternative hypothesis. The research hypothesis will be one-tail or directional 3) State your level of significance as either .05 or .01 4) Conduct the t-test equation 5) Compare the obtained and critical value.
needs and Christopher will reply soon.