raw-Hill E... O CONFIDENCE INTERVALS AND HYPOTHESIS TESTING E Understanding how the choice of a level of significance affects... A researcher is going to perform a left-tailed hypothesis test. The test statistic will follow a standard normal distribution. Answer parts (a) and (b) below. You may use the tool below in the scratch work area to help you. Your work with the tool will not be graded. (a) The researcher might choose 0.01, 0.05, or (b) After choosing the level of significance, the 0.10 for the level of significance for the left- researcher takes a sample and finds that the tailed test. For each potential choice for the value of the test statistic is z = - 1.378. For level of significance, find the critical value. which of the levels of significance would the null Round your answers to three decimal places. hypothesis be rejected? Choose all that apply. a =0.01 Critical value at a = 0.01: a= 0.05 Critical value at a = 0.05: Critical value at a = 0.10: a =0.10 None of the above X 3 ? Scratch work ( Not graded)