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Tutor profile: Christopher O.

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Christopher O.
Tutor in public health, social sciences, Spanish, English, & math
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Questions

Subject: Spanish

TutorMe
Question:

What's the present verb tense in Spanish?

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Christopher O.
Answer:

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

TutorMe
Question:

What are the epidemiological designs and their differences

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Christopher O.
Answer:

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

Subject: Statistics

TutorMe
Question:

How do I do a t-test for a dependent sample?

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Christopher O.
Answer:

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.

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