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Suppose you have a treatment that you suspect may alter performance on a certain task. You compare the mean of your sample to the norm. Further, suppose you use az-test for means and your result is statistically significant (z=2.70,p<0.05, one-taifed). Glven your statistically significant result, indicate which (if anyl of the following statements is true. Check each statement that is true. In other words, you may check none, one, several, or all of the statements. You have absoluidy disproved the null hypothesis ghat is, there is no ditference between the population means). You have found the protablity of the null hypothesis being true.

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All of the assertions are false. A statistically significant finding does not necessarily imply that the null hypothesis has been proven incorrect, nor does it indicate how likely it is to be true.

What is a norm defined as?

Generally speaking, the word "norm" describes something that is customary, typical, anticipated, or standard. Norms are established definitions of beneficial attitudes and actions that ought to be commonplace, or "the norm," whenever a group is working together. They apply to cooperation and collaboration.

What Is a Z-Test?

When the variances are known and the sample size is large, a z-test is a statistical test that is used to assess whether two population means differ from one another.

to learn more about null hypothesis visit link:

https://brainly.com/question/16945299

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