402216 1927122 qx32qy7 Jump to level 1 A clinical researcher performs a clinical trial on 15 patients to determine whether a drug treatment has an effect on serum glucose The sample mean glucose of the patients before and after the treatment are summarized in the following table The sample standard deviation of the differences was 9. \"CINE\"! Sample mean glucose (mg/dL) Before treatment 93 What type of hypothesis test should be performed? Select What is the test statistic? LEXI 0123 Left-tailed Z'tESt ' Paired ttest , > _ Two-tailed ztest What is the number of degrees of freedom? _EX- 25 Unpaired ttest Does sufcient evidence exist to support the Claim that the dru- treatment has an effect on serum glucose at the a = 0.01 significance level