The basic chemical properties of an element are established by the:
a. atomic mass
b. atomic number
c. type of protons in the nucleus
d. diameter of the nucleus
b
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We calculate BSS = 10 * (540.3 - 543.6)2 + 16 * (602.9 - 543.6)2 + 17 * (489.8 - 543.6)2 = 105578.2 WSS = (10 - 1) * 46.42 + (16 - 1) * 47.42 + (17 - 1) * 48.92 = 91337.4 F = (BSS / (k-1)) / (WSS / (n-k)) = (105578.2 / (3 - 1)) / (91337.4 / (43 - 3)) = 23.1 The critical F value is F.05,2,40 = 3.23. The observed value vastly exceeds this, so we clearly reject the null hypothesis and conclude that the means differ across the groups.
As the Baby Boom ages and the elderly cohorts get larger, the dependency ratio in the United States will
A) drop. B) rise. C) disappear. D) stay the same. E) fluctuate more and more.
Complete the following chart (round off relative humidity to the nearest percent).
Poland has a long-standing history of working to oppose the Communist domination of its country.
a. true b. false