Consider the following competing hypotheses: (You may find it useful to reference the appropriate table: z table or t table) Ho HD 0; HA: MD < 0 a -3.0, SD = 6.6, n = 15 The following results are obtained using matched samples from two normally distributed populations: a-1. Calculate the value of the test statistic, assuming that the sample difference is normally distributed. (Negative value should be indicated by a minus sign. Round final answer to 3 decimal places.) Test statistic a-2. Find the p-value. p-value < 0.01 O 0.01 p-value < 0.025 0.025 s p-value < 0.05 O 0.05 s p-value < 0.10 O p-value 0.10 b. At the 10% significance level, what is the conclusion to the hypothesis test? Do not reject Ho since the p-value is greater than the significance level. Reject Ho since the p-value is greater than the significance level. Do not reject Ho since the p-value is less than the significance level. Reject Ho since the p-value is less than the significance level. c. Interpret the results at a = 0.10. We cannot conclude that the mean difference differs from zero. We conclude that the mean difference differs from zero. We cannot conclude that that the mean difference is less than zero. We conclude that the mean difference is less than zero.