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Occurrence of Grey Hair

Keywords: comparing proportions


The Family Circle of 26 June 1990 wrote

"It's a draw, according to two Australian researchers. By age 25, up to 29% of all men and up to 34% of all women have some grey hair, but this difference is so small that it's considered insignificant"


The data is in the description above.


"Silver Threads Among the Gold: Who'll Find Them First, a Man or a Woman?" Family Circle, 26 June 1990.
Johnson, R. (1994). Elementary Statistics, Sixth Edition, PWS-Kent, Boston.


If 1000 men and 1000 women were involved in this research, would the 5% difference mentioned be significant at the 0.01 level?



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