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2. Randomized controlled trial - Wikipedia

   en.wikipedia.org/wiki/Randomized_controlled_trial

   A randomized controlled trial (or randomized control trial; [2] RCT) is a form of scientific experiment used to control factors not under direct experimental control. Examples of RCTs are clinical trials that compare the effects of drugs, surgical techniques, medical devices, diagnostic procedures, diets or other medical treatments.

3. Always (brand) - Wikipedia

   en.wikipedia.org/wiki/Always_(brand)

   Always is an American brand of menstrual hygiene products, including maxi pads, ultra thin pads, pantyliners, disposable underwear for night-time wear, and vaginal wipes.A sister company of Procter & Gamble, it was first invented and introduced in the United States in 1983 by Tom Osborn, a mid-level employee at Procter & Gamble, then nationally in May 1984.

4. Confidence interval - Wikipedia

   en.wikipedia.org/wiki/Confidence_interval

   A simple example arises where the quantity to be estimated is the population mean, in which case a natural estimate is the sample mean. Similarly, the sample variance can be used to estimate the population variance. A confidence interval for the true mean can be constructed centered on the sample mean with a width which is a multiple of the ...

5. Free sample of Kotex pads - AOL

   www.aol.com/2010/09/28/free-sample-of-kotex-pads

   Get a free sample of Kotex pads when you share your name, address, e-mail, sex, and date of birth. You'll also need to answer three questions about your use of pads. You can opt in or out of the ...

6. Free sample of Poise pads - AOL

   www.aol.com/2010/05/10/free-sample-of-poise-pads

   For premium support please call: 800-290-4726 more ways to reach us

7. Free Sample of Carefree Pads - AOL

   www.aol.com/news/2010-11-12-free-sample-of...

   Get a free sample of Carefree ultra protection pads with wings and/or a coupon for $1 off Carefree liners. Share your name, address, email, gender and date of birth to get the freebie and coupon.

8. Simple random sample - Wikipedia

   en.wikipedia.org/wiki/Simple_random_sample

   Simple random sample. In statistics, a simple random sample (or SRS) is a subset of individuals (a sample) chosen from a larger set (a population) in which a subset of individuals are chosen randomly, all with the same probability. It is a process of selecting a sample in a random way. In SRS, each subset of k individuals has the same ...

9. Sample size determination - Wikipedia

   en.wikipedia.org/wiki/Sample_size_determination

   Sample size determination or estimation is the act of choosing the number of observations or replicates to include in a statistical sample. 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 ...