The certified percentage of nickel in a particular NIST reference steel sample is 1.12%, and the standard deviation associated with this number is 0.03%. A new spectrometric method for the determination of nickel produced the following percentages: 1.10, 1.08, 1.09, 1.12, 1.09. ls there an indication of bias in the method at the 95% level?
· Here are four sketches of pure substances. Each sketch is drawn as if a sample of the substance were under a microscope so powerful that individual
· Here are four sketches of pure substances. Each sketch is drawn as if a sample of the substance were under a microscope so powerful that individual atoms could be seen. · Decide whether each sketch shows a pure sample of an element or a pure sample of a compound. Substance




