Hi,

Thank you for your help.

a researcher is interested in whether a new teaching method influences the public speaking skills of students in anintroductionto communications class the researcher knows that public speaking skills in the classroom normally distributed with Mew equals 15 + Sigma equals 3 and a sample of students receiving the new teaching method the researcher finds a mean score of public speaking skills of 20 the researcher wants to know if the mean score of the sample is greater than the mean of the population at an alpha level of 0.05 what is the critical region?

1. 1.645
2. 1.96
3. 1.645
4. 1.96