A sample of n = 30 scores produces a calculated t statistic of t = -2.029. If the researcher is using a one-sample t-test and is testing his hypothesis at the alpha=.05 level, the correct statistical decision is:     a. The researcher can reject the null hypothesis whether it was a directional or non-directional hypothesis.   b. The researcher can fail to reject the null hypothesis if this was a directional hypothesis but not if it was a non-directional hypothesis.   c. It is impossible to make a decision about H0 without more information   d. The researcher can fail to reject the null hypothesis whether it was a directional or non-directional hypothesis.   e. The researcher can reject the null hypothesis if this was a directional hypothesis but not if it was a non-directional hypothesis

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Q: A sample has a mean of M = 39.5 and a standard deviation of s=4.3. In a two-tailed hypothesis test…

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.