c) The above inferences are performed using a sample of size 25, randomly selected from a normal population. As such, the above inferences were valid.

1. Would one mean inference be valid if a sample of size 12 is obtained from a strongly skewed population? Explain. (2 marks)

1. Would one mean inference be valid if a sample of size 100 was obtained from a normally distributed population? Explain. (2 marks)

1. Would one mean inference be valid if a sample of size 12 was obtained from a normal population? Explain. (2 marks)