Biostatistics 2 Flashcards

1
Q

Define Research Question

A

Guides and centers the research

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2
Q

Define Scientific Hypothesis

A

A proposed explanation for a given phenomenon

Educated Guess

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3
Q

Define Experimental hypothesis

A

Predicted observation you will obtain from an experiment

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4
Q

Define Null Hypothesis

A

Ho: u1 =u2

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5
Q

Define Alternative Hypothesis

A

H1: u1 doesn’t = u2
H1: u1 > u2

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6
Q

Define Random error

A

Unknown/unpredictable change in a study

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7
Q

Define systematic error

A

Bias in measurement

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8
Q

Measuring Random Error

A

P value gives probability of being wrong when the null is rejected
Does NOT give you magnitude
Power gives the probability of making a correct decision when null is truly false

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9
Q

What is a p value

A

How confident are you that the difference you found between or among groups are due to chance?

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10
Q

What is the alpha value?

A

What threshold are you comfortable with saying that an observed difference was due to your intervention and not chance?
This is the value your p value must be below to be considered statistically significant

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11
Q

What is power?

A

If you do not find a difference between drug and placebo, how confident are you that the difference is not there?
Ability to detect a difference if one truly exists

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12
Q

Factors that effect power are?

A

Willingness to accept a Type 1 error
Effect size
Beta error
Sample size

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13
Q

**Power ONLY matters if…

A

the researcher did NOT find a statistically significant result

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