1a) S ___ X is a known estimate: True or False 1b) Population mean is a known estimate: True or False 1c) The objective of a confidence interval is...

1a) S ___ X is a known estimate: True or False

1b) Population mean is a known estimate: True or False

1c) The objective of a confidence interval is not to bracket the fixed population mean: True or False

1d) T-test discusses the deviation of a random variable ___ X from its mean measured in standard deviation of the sample mean units: True or False

1e) T-test is used to test a hypothesis about the population mean: True or False 

Explain all answers.