Let X be the hardness measurement of a certain type of iron. A random sample of size n=40 is taken and it is found that the sample mean is 172.3 and sample variance is 100. Test the null hypothesis Ho : μ = 170 H : μ > 170 at the 5% level of significance. The value of the test statistic and the decision are 1.45; do not reject the null hypothesis 11.25; reject the null hypothesis 0.025; do not reject the null hypothesis 1.125; do not reject the null hypothesis

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