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Earn +20 ptsQ: What percent of a sample of As-81 remains un-decayed after 43.3 seconds?
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What fraction of a radium sample will remain after 3240?
The answer depends on 3240 WHAT: seconds, days, years?
Why is it not practical to have a macroscopic sample that is 100 percent pure?
because
If 57 mg of radium 221 has a half life of 30 seconds. How long will it take for 95 percent of the sample to decompose?
try using my formula.... ar=a(1/2)^2t therefore, 57(.05) = 57(1/2)^2t and 57s cancels out, .05 = 1/2^2t log .05 = log .5^2t divide log .5 from both sides, 4.32 = 2t t = 2.16, therefore 126 seconds or 2 minutes and 6 seconds
The movie rating website rotten tomatoes reported that 92 percent of a sample of 39 movie critics hated the 2005 horror movie the fog is the 92 percent statistic or parameter?
parameter !
You decide to select ten percent of the inmates in a prison to receive a survey You decide you want your sample to be representative of the population What procedure would provide the most represent?
Select the sample so that it will have the same percentages of people that are men and women as are in the system, and also match the percentage based on educational background and ethnicity
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