A researcher believes that women today weigh less than in previous years. To investigate this belief, he randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs.   ____     5.           Refer to Case Study 13-1. The obtained value of the appropriate statistic for testing H0 is _________.   tobt = -2.07 tobt = +2.07 tobt = -0.32 tobt = +0.32       ____     6.           Refer to Case Study 13-1. The df for determining tcrit = _________. 41 40 39 need more information     ____     7.           Refer to Case Study 13-1. Using α = 0.01, 1-tail, the appropriate critical value is _________. -1.684 -2.423 ±1.684 ±2.423

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