In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.

[EX Q]: Question: We want to compare the means of two populations that follow normal distributions and have the same variance. We take two samples of size n1 and n2. When constructing a confidence interval we will have to calculate a value t for a Student's T distribution with:
Options: <1> 2 degrees of freedom. <2> n1 + n2 - 2 degrees of freedom. <3> (n1 + n2) - 1 degrees of freedom. <4> (n1 x n2) / 2 degrees of freedom. <5> Degrees of freedom calculated with the formula of Welch or Smith-Satterwhite.
[EX A]: 2

[EX Q]: Question: Pseudomonas aeruginosa is typically:
Options: <1> Sensitive to most antibiotics used in human medicine. <2> Pathogen obligated. <3> Opportunistic pathogen. <4> Commensal bacteria of the digestive tract. <5> Intracellular pathogen.
[EX A]: 3

[EX Q]: Question: Which of the following strands of DNA has the same nucleotide sequence (except the change of T for U) as its primary transcript:
Options: <1> The coding strand. <2> The mold thread. <3> The leading thread. <4> The delayed strand <5> Any.
[EX A]:
1