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Nationally 1 in 88 children are diagnosed with ASD ("CDC features -," 2013). Is there sufficient data to show that the incident of ASD is more in Arizona thannationally? Test at the 1% level.7.3.6The economic dynamism, which is the index of productive growth in dollars for countries that are designated by the World Bank as middle-income are in table #7.3.8 ("SOCR data 2008," 2013). Countriesthat are considered high-income have a mean economic dynamism of 60.29. Do the data show that the mean economic dynamism of middle-income countries is less than the mean for high-income countries? Test at the 5% level.Table #7.3.8: Economic Dynamism of Middle Income Countries25.805737.451151.91543.695247.850643.717858.076741.164838.079337.725139.655342.026548.615943.855549.136161.928141.954344.934646.052148.365243.625250.986659.172439.628233.607421.6643
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7.3.8Maintaining your balance may get harder as you grow older. A study was conducted to see how steady the elderly is on their feet. They had the subjects stand on a force platform and have them react to a noise. The force platform then measured how much they swayed forward and backward, and the data isin table #7.3.10 ("Maintaining balance while," 2013). Do the data show that the elderly sway more than the mean forward sway of younger people, which is 18.125 mm? Test at the 5% level.Table #7.3.10: Forward/backward Sway (in mm) of Elderly Subjects1930201929252124508.1.4Suppose you compute a confidence interval with a sample size of 100. What will happen to the confidence interval if the sample size decreases to 80?
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