Biostatistics

Approach to which statistical test to use:

This algorithm is in my revision notes

1. Is type of variable- i.e continuous,discrete

2. Is the continuous or discrete variable normally distributed or not

3. How many samples in the para or non parametric variable? One, two or more?
4. If two samples, are they independent or paired/matched?

Make sure the assumptions of the test are not violated

 Parametric
- the distribution of scores in a population is normal & variance equal and when the sample size is large.

Nonparametric

- the distribution of scores in a population is not normal or if the sample size is small

 The following is the snap capture of my notes 

Mock MCQ physics

Thanks for those who bought my revision notes again.I have had discussion with one of the reader.Most of the self-recalled questions were included in the revision notes without mentioning as the past years question, which i intended to publish as MCQs but lacked of time at the moment.

Physics: questions on calculation for pass years questions example were:
calculation of the penumbra size of source, MU for SAD/SSD, electron energy selection, electron shield thickness,transmission factor the thickness of bunker barrier

Which of the following is correct about Attenuation of X ray ?

1.           related to inverse square law

2.           associated with scattering

3.           not related to density of material

4.           directly proportional to atomic number

CPE equilibrium can occur at 

1.           at the building up region 

2.      tissue interface

3.           pneumbra region

4.           beyond maximum

5.           50% IL

       

LINAC components

1.           steering magnent use to direct the beam to the filter

2.           Focusing magnent to direct electron to target

3.           magnetron to induce current 0.5mA through waveguide system (Ans 100mA)

4.           pulse electron 50keV is directed to the magnetron by modulator(Ans 100eV)

Compton scattering / Pair Production / Photoelectric effect which is correct

1.           equal amount of energy is always shared among positron and electron pair

2.           minimum amount of energy for pair production is 0.511MeV

3.           electron and positron is 180 deg opposite direction

4.           chance of pair production increase with energy

Revision notes 2

I would like to thank for those who have bought the notes.I hope you would  find it useful as a guide to learn and further added value to it during your preparation for the exam or as a last minute revision notes during adrenaline-rush moments. If any suggestion for improvement or any unsatisfactory, please don't hesitate to email me for improvement.

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