Hi,

Thank you for your help.

a researcher is interested in whether a new teaching method influences the public speaking skills of students in an introductory to communications class the researcher knows that public speaking skills in the class are normally distributed with new equals 15 + Sigma equals 3 and a sample of students receiving the new teaching method the researcher finds a mean score a public speaking skills of 20 the researcher conducted to have a hypothesis test to determine if the mean score the sample is greater than the mean of the population at an alpha level of 0.05 the researcher found a z statistic of + 2.75 what decision should the researcher make?

1. Fail to reject the null hypothesis
2. Accept the alternative hypothesis
3. Reject the alternative hypothesis
4. Reject the null hypothesis