A new study suggests that women with asthma exposed to air pollution, even before conception, significantly increase the

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A New Study Suggests That Women With Asthma Exposed To Air Pollution Even Before Conception Significantly Increase The 1 (50.16 KiB) Viewed 24 times

A new study suggests that women with asthma exposed to air pollution, even before conception, significantly increase their risk of delivering a premature baby. The researcher reported gestational ages for two groups of women with asthma - one group of 48 women exposed to air pollution (mean 35 weeks with a standard deviation of 1 week) and another group of 42 women not exposed to air pollution (mean = 39 weeks with a standard deviation of 1 week). Which one of the following statements is INCORRECT? (Set alpha level at 0.05; Pooled standard deviation = 1) M The null hypothesis is that gestational age is not different between women with asthma who are exposed to air pollution and those who are not exposed to air pollution. O The obtained test statistic is approximately -18.93. The critical test statistic is 1.960. The degrees of freedom is 89. The decision should be to reject the null hypothesis. O The ratio of variances is 1.