b-1. Calculate the value of the test statistic under the assumption that the population variances are not equal. (Negative value should be indicated by a minus sign. Round final answer to 3 decimal places.) Test statisticConsider the following competing hypotheses and accompanying sample data drawn independently from normally distributed populations. (You may find it useful to reference the appropriate table: z table or t table) Ho: H1 - H2 2 0 HA: H1 - H2