Yes, the value of the test statistic is z = –2.07. Yes H0 is rejected.
For example, if the required significance level for a result is 0.05, the corresponding value of z must be greater than or equal to z* = 1.645 (or less than or equal to -1.645 for the one-sided alternative). mean is smaller than the null hypothesis).
If the p-value is less than 0.05, reject the null hypothesis that the means are not different and conclude that the difference is significant. If the p-value is greater than 0.05, you cannot conclude that there is a significant difference.
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