Please work out these question and show me how you got the answer The following data were obtained from a between-subjects manipulation:

Please work out these question and show me how you got the answer

The following data were obtained from a between-subjects manipulation:

• Treatment 1 = 13, 9, 7, 11
• Treatment 2 = 9, 5, 5, 9

Determine if there is a significant difference between the treatments.  Explain your conclusion.

A researcher obtains the following sample from a population with mean = 8 and an unknown standard deviation:

Sample scores = 5, 0, 4, 7, 3, 7, 8, 2, 9

Is there evidence to suggest that this sample is significantly different from the population?  Explain.