Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? the notation using brackets in subscripts denote the I want to combine those 2 groups to obtain a new mean and SD. except for $\sum_{[c]} X_i^2 = \sum_{[1]} X_i^2 + \sum_{[2]} X_i^2.$ The two terms in this sum When working with data from a complete population the sum of the squared differences between each data point and the mean is divided by the size of the data set, Since it is observed that \(|t| = 1.109 \le t_c = 2.447\), it is then concluded that the null hypothesis is not rejected. In this step, we divide our result from Step 3 by the variable. 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