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Distribution Tables Normal Distribution z score This is the graph of a standard normal distribution that has a horizontal axis labeled from -5 to 5 in increments of 1 . The area under the curve from 1.2 to the left is shaded. The area of the shaded region is 0.88493 . Distribution Tables Normal Distribution area left right middle two-tailed z score probability 0.11507 This is the graph of a standard normal distribution that has a horizontal axis labeled from -5 to 5 in increments of 1 . The area under the curve from 1.2 to the right is shaded. The area of the shaded region is 0.11507. Normal Distribution area:leftrightmiddletwo-tailed Farea: left right middle two-tailed z score second z score probability This is the graph of a standard normal distribution that has a horizontal axis labeled from -5 to 5 in increments of 1 . The area under the curve between -1.2 and 1.2 is shaded. The area of the shaded region is 0.769861 . Distribution Tables Normal Distribution area: left right middle two-tailed z score second z score probability This is the graph of a standard normal distribution that has a horizontal axis labeled from -5 to 5 in increments of 1 . The area under the curve from -1.2 to the left is shaded and the area from 1.2 to the right is shaded. The area of the shaded region is 0.230139 . ou may need to use the appropriate technology to answer this question. or each group are also provided. Managers want to use these data to test the hypothesis that the mean examination score is the same for all three plants. State the null and alternative hypotheses. H0:1=2=3 Ha : Not all the population means are equal. H0:1=2=3Ha:1=2=3 H0 : Not all the population means are equal. Ha:1=2=3 H0 : At least two of the population means are equal. Ha : At least two of the population means are different. H0:1=2=3Ha:1=2=3 Find the value of the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value = State your conclusion