NO.PZ202106160300003904
问题如下：
An analyst is examining the annual growth of the money supply for a country over the past 30 years. This country experienced a central bank policy shift 15 years ago, which altered the approach to the management of the money supply. The analyst estimated a model using the annual growth rate in the money supply regressed on the variable (SHIFT) that takes on a value of O before the policy shift and 1 after. She estimated the following:
Critical t-values, level of significance of 0.05:
One-sided, left side: -1.701
One-sided, right side: ±1.701
Two-sided: ±2.048
Testing whether there is a change in the money supply growth after the shift in policy, using a 0.05 level of significance, we conclude that there is:
选项：
A.sufficient evidence that the money supply growth changed B.not enough evidence that the money supply growth is different from zero C.not enough evidence to indicate that the money supply growth changed解释：
A is correct. The null hypothesis of no difference in the annual growth rate is rejected at the 0.05 level: The calculated test statistic of-8.16188 is outside the bounds of ±2.048.
如题。。。。。。。。
