When using the independent t-test which assumption(s) should be made?

In the following histogram, what does its shape suggest?   

From the table below, indicate how many people took part in this experiment? 

A standard deviation that has a value of 0 is best explained by which of the following statements?

Comparing Two Means

  Which of the following key word(s) best describe the type of variable Ln Age? Select ALL answers that apply. 

The table below shows three variables that have been transformed or recoded. Age was log-transformed, LDL (Low Density Lipoprotein) was put into different groups according to clinical guidelines and Number of children was recoded. The data type of these three newly transformed variables may be different from the original variable. Answer the following questions.  

 Which of the following are measures of dispersion? Select ALL answers that apply. 

The patient receives prednisone 10mg PO four times a day for asthma attack. How many tablets will the nurse administer per day? 

The patient has an order for Deltasone 20mg po four times a day. Deltasone is supplied in 2.5mg, 5mg, and 50mg tablets. The nurse will give (          ) tablets of (        )mg per day.