TNS Exam 1 Questions with Complete Solutions (Latest 2025) What is the primary motivation of experimentation? - Correct Answers ✅To disprove or fail to disprove a hypothesis What does the scientific method consist of? - Correct Answers ✅Formalized steps where by a theory is formed, tested, and revised What's the purpose of hypothesis testing? - Correct Answers ✅Used to evaluate the strength of evidence from the sample and provides a framework for making determinations When should a t-test be used? - Correct Answers ✅When comparing the averages of two groups, with relatively small samples How to read T value? - Correct Answers ✅- larger T-value = the more different the groups are
- more different groups are = better chances that groups are
"significant" How to read P value? - Correct Answers ✅- smaller P value = more different the groups are
- threshold: .05 or .01 usually
- the probability of being wrong if you conclude that your
groups are different 1 / 3
TNS Exam 1 Questions with Complete Solutions (Latest 2025) When to use an ANOVA test? - Correct Answers ✅When making multiple comparisons between groups
- because if we were to do a t-test, it would be more likely to
- threshold value used to determine whether a test statistic is
- generally uses the central limit theorem for construction
- regions where test statistic is unlikely to lie
make an incorrect conclusion since each additional comparison with a t-test multiplies probability of making a mistake What is the alpha value? - Correct Answers ✅the probability of making a type 1 error (false positive) that a researcher is willing to make (usually it is 0.05)
statistically significant What is a sampling distribution? - Correct Answers ✅Mean, Proportion, and T-sampling distribution
What is the critical value? - Correct Answers ✅It is the cutoff between retaining or rejecting null hypothesis
What is the obtained value? - Correct Answers ✅ 2 / 3
TNS Exam 1 Questions with Complete Solutions (Latest 2025) What is Magnetic Resonance Imaging? - Correct Answers ✅It is a cylindrical magnet with an open bore, and has an electromagnet. It is usually super conducting. It various transmit and receive antennae through radiofrequency.How does the magnetic field of MRI work? - Correct Answers ✅As protons rotate, it creates a tiny magnetic field. The external field (B0) aligns the protons parallel and antiparallel to B0. There are more protons that align parallel compared to antiparallel.What is precession? - Correct Answers ✅Protons precess about an axis and the frequency depends on external field strength (B0) and the type of atom What is excitation? - Correct Answers ✅sending energy into spinning nuclei which puts them in a higher energy level What are T1 scans? - Correct Answers ✅They involve single 90 degree pulses. As the signal decays contrast is enhanced, the overall strength signal weakens.
- lightest: white matter
- gray: gray matter
What is a signal? - Correct Answers ✅It is a simple echo taken at time T1 of a single pulse.
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