Adults aged 16 or older were assessed in three types of literacy in 2003: prose, document, and quantitative. The scores in document literacy were the same for 19- to 24-year-olds and for 40- to 49- year-olds. A random sample of scores from a later year showed the following statistics. Age group Mean Score Population SD Sample size 19–24          280          56.2                       40 40–49          315          52.1                       35 What does your testing say about the claim that there is no difference in mean scores?

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