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Tutor profile: Noor S.

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Noor S.
PhD in Clinical Psychology - 10+ years experience in academia
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Questions

Subject: Psychology

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Question:

A very bright 13-year old child is engaged in an individual interview with a psychologist who is seated directly across the table from the child. The psychologist says to the child, "Define the word propinquity - what does the word propinquity mean?" What is the child doing with the psychologist? (developmental psychology)

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Noor S.
Answer:

The child is taking the vocabulary subtest of an individually-administered IQ test, most likely the WISC (Wechsler Intelligence Scale for Children)

Subject: Pre-law

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Question:

What are the three most common defences for an assault charge (Canadian law)?

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Noor S.
Answer:

Self-Defence: This is a defence that is provided for in the Criminal Code. There are a number of components of the defence which the accused must establish in order to use this defence successfully, such as showing that the use of force was reasonable to respond to a real threat. Consent: This defence to a charge of common assault if you can prove that the person assaulted consented to this, as in, for example, a sporting activity. This is a complex defence, however, and its success depends on the circumstances of the assault and its consequences. Absence of intent: This defence rests on showing that the accused didn’t assault the alleged victim on purpose, that the assault was the result of some other circumstance.

Subject: Statistics

TutorMe
Question:

A researcher is interested in comparing levels of reading comprehension with and without background noise. She selects two random samples and asks one group $$ n_{1}=9 $$ to read with background noise and another group $$ n_{2}=9 $$ to read without background noise. After administering a test of reading comprehension, she finds that when background noise was present, $$ M_{1} = 61 $$; $$ SS_{1} = 456 $$ and when background noise was not present, $$ M_{2}=72; SS_{2}=440 $$. Test the hypothesis that background noise affects reading comprehension with $$ \alpha= .05 $$. Make sure to use the four steps for hypothesis testing in your response.

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Noor S.
Answer:

Independent means t-test 1. $$ H0: \mu1 - \mu2 = 0 $$ $$ H1: \mu1 - \mu2 \ne 0 $$ 2. Critical region: $$ df^{total} =df^{1} + df^{2} = 8+8 = 16 $$, $$ $$ two-tailed $$ \alpha= .05, t^{crit} = +/-2.120 $$ 3. a. $$ sp^{2} = (SS_{1} + SS_{2})/df^{1}+df^{2} = 440+\frac{456}{16} = 56 $$ b. $$S( M_{1} – M_{2}) = √ \frac{sp^{2}}{n_{1}} + \frac{sp^{2}}{n_{2}} = √ \frac{56}{9} + \frac{56}{9} = √12.44 = 3.53 $$ c. $$ t = (M_{1} – M_{2}) – \frac{(\mu1 - \mu2)}{S(M_{1} – M_{2})} = \frac{72-61}{3.53} = 3.12 $$ 4. $$ t = 3.12 > t = 2.120 $$: Reject the null hypothesis. Therefore we can conclude that background noise DOES affect reading comprehension. People who read with no background noise comprehend significantly better than those who read with noise present.

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