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  2. Sample size determination - Wikipedia

    en.wikipedia.org/wiki/Sample_size_determination

    The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is usually determined based on the cost, time, or convenience of collecting the data, and the need for it to offer sufficient statistical power. In complex studies ...

  3. Reference ranges for blood tests - Wikipedia

    en.wikipedia.org/wiki/Reference_ranges_for_blood...

    Prostate specific antigen (PSA) 40–49 years: 1.2–2.9 [75] μg/L [5] [15] or ng/mL [23] More detailed cutoffs in PSA – Serum levels: 70–79 years, non-African-American: 4.0–9.0 [75] 70–79 years, African-American: 7.7–13 [75] PAP: 3 [23] units/dL (Bodansky units) Calcitonin: 5, [76] 15 [76] ng/L or pg/mL: Cutoff against medullary ...

  4. p-chart - Wikipedia

    en.wikipedia.org/wiki/P-chart

    One technique is to fix sample size so that there is a 50% chance of detecting a process shift of a given amount (for example, from 1% defective to 5% defective). If δ is the size of the shift to detect, then the sample size should be set to n ≥ ( 3 δ ) 2 p ¯ ( 1 − p ¯ ) {\displaystyle n\geq \left({\frac {3}{\delta }}\right)^{2}{\bar {p ...

  5. Confidence interval - Wikipedia

    en.wikipedia.org/wiki/Confidence_interval

    A 95% confidence level does not mean that 95% of the sample data lie within the confidence interval. A 95% confidence level does not mean that there is a 95% probability of the parameter estimate from a repeat of the experiment falling within the confidence interval computed from a given experiment. [25]

  6. Hazard ratio - Wikipedia

    en.wikipedia.org/wiki/Hazard_ratio

    For example, a hazard ratio of 2 is thought to mean that a group has twice the chance of dying than a comparison group. In the Cox-model, this can be shown to translate to the following relationship between group survival functions : S 1 ( t ) = S 0 ( t ) r {\displaystyle S_{1}(t)=S_{0}(t)^{r}} (where r is the hazard ratio). [ 4 ]

  7. Blood alcohol content - Wikipedia

    en.wikipedia.org/wiki/Blood_alcohol_content

    Most countries forbid operation of motor vehicles and heavy machinery above prescribed levels of blood alcohol content. Operation of boats and aircraft is also regulated. Some jurisdictions also regulate bicycling under the influence. The alcohol level at which a person is considered legally impaired to drive varies by country.

  8. Timeline of the far future - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_far_future

    This is an accepted version of this page This is the latest accepted revision, reviewed on 26 January 2025. Scientific projections regarding the far future Several terms redirect here. For other uses, see List of numbers and List of years. Artist's concept of the Earth 5–7.5 billion years from now, when the Sun has become a red giant While the future cannot be predicted with certainty ...

  9. Turquoise - Wikipedia

    en.wikipedia.org/wiki/Turquoise

    Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.

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