4. Horvat y colaboradores utilizaron espectroscopia de absorci�n at�m.pdf

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4. Henry, age 35, is a stay at home dad. His wife, Melissa, age 34 , is a physician, has $160,000 of earned income. Answer the following questions: a. Assume Melissa does not have a plan at work. How much can Henry and Melissa contribute each to a traditional IRA? How much of the contribution can they deduct? To a Roth IRA? b. Now assume Melissa actively participates in a plan at work. How much can each contribute to a traditional IRA? How much of the contribution can they deduct? To a Roth IRA?.

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4. Horvat y colaboradores utilizaron espectroscopia de absorcin atmica para determinar la
concentracin de Hg en cenizas. Para esto evaluaron el efecto que tendra en la medicin el proceso
de digestin. Asi, trataron un grupo de muestras con HNO3 y otro grupo de muestras con agua
regia ( HNO3:HCl1:3). Los resultados se presentan a continuacin: Usando una prueba estadistica
apropiada, estos resultados a. tienen precisin similar? Al 95 de confianza b. son iguales
estadisticamente? Se podr utilizar cualquiera de los mtodos de digestin para analizar Hg ? Al 95
de confianza (F exp 5.86 - No hay evidencia que hay diferencia significativa en las desviaciones
estndar al 95% de confianza Desviacin estndar ponderada =5.98,Texp4.28 - hay diferencia
significativa entre ambos mtodos, por lo que no se pueden usar indistintamente - tendria que
evaluarse la exactitud (analizando un estndar certificado) para escoger el que sea exacto)

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