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MA 265 Final Exam With Correct Answers 2025

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Any system can be homogenous with the trivial solution -(correct answer)True Fewer equations that unknowns can never have a solution -(correct answer)False (can have no solution or infinitely many) A system with linearly independent columns can have a unique solution -(correct answer)True (A^T)^T = A -(correct answer)True (A+B)^T = A^T + B^T -(correct answer)True (AB)^T = A^T*B^T -(correct answer)False ((AB)^T = B^T*A^T) r(A)^T = (rA)^T -(correct answer)True Definition of symmetric -(correct answer)A^T = A Definition of skew symmetric -(correct answer)A^T = -A (A^-1)^-1 = A -(correct answer)True (AB)^-1 = B^-1 * A^-1 -(correct answer)True (A^-1)^T = (A^T)^-1 -(correct answer)True What method is used to find the inverse of a matrix by using an augmented matrix? -(correct answer)Gauss-Jordan How can you solve a linear system (Ax=b) using inverse matrices? -(correct answer)x = A^-1 * b Difference between REF and RREF -(correct answer)All other entries in columns with

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A Level Psychology Attachment 2025
What is an attachment? -(correct answer)An emotional link between the child and there

primary caregiver, which ties them together. Four ways an attachment can be tested? -(correct

answer)1. Seeking Proximity 2. Distress on seperation 3. Joy on reunion 4. General Behaviour

What is a bond? -(correct answer)A bond is a set of feelings that ties one person to another

Benefits of an attachment -(correct answer)Survival Food Love Security Two caregiver-infant

interactions are... -(correct answer)Reciprocity and Interactional Synchrony What is reciprocity?

-(correct answer)Reciprocity is a description of how two people interact, the mother infant

interaction is reciprocal in that they both respond to each others signal and each shows a

response from the other. What is interactional synchrony? -(correct answer)Where mother and

infant reflect both the actions and emotions of one and other and do this in a co-ordinated

manner. Outline research that supports reciprocity -(correct answer)Feldman found that both

babies have periodic alert phases to signal that they are ready to interact and mothers respond

to this on average 2/3rds of the time. He also found that from 3 months of age this interaction

is more frequent and involved close attention to verbal signals and facial expressions.

Brazleton discovered the 'Dance' in which each partner responds to each others moves. Both

the baby and the PCG can initiate interactions and take turns in doing so. Outline research that

supports interactional synchrony -(correct answer)Meltzoff and Moore conducted a study in

which they observed infants at two weeks old and had adults show one of three facial

expressions or one of three gestures. The children response was filmed and identified by

independent observers. They found an association between the action of the adult and the

action returned by the babies. Isabella observed 30 mothers and infants and found that high

levels of synchrony were associated with better mother-infant attachment. Evaluate research

into infant-caregiver interactions -(correct answer):) - Controlled observations in a controlled

experimental setting with standardised procedures and operationalised behavioural categories

with filming from multiple angles. High reliability as can be repeated to check consistency. :) -

, These observations are less prone to demand characteristics as obviously babies are unaware

an experiment is taking place and thus will not change their natural behaviours. :( -

Observations susceptible to observer bias as they require subjective interpretation from

researches who may perceive behaviour as being something else to what it really is, this can

lower the validity. :( - Observations only look at the changes in hand movements and gestures.

It is very difficult to be certain that the moves or gestures etc, were actually deliberate or

accidental, this reduces the value of the insight into caregiver-infant interaction. :( - These

studies don't tell us the purpose of synchrony or reciprocity, they simply state that it happens

and don't imply anything about why and what the purpose is. Other studies have said that it is

important in the development of empathy and morals. :( - Conducting research into

mother-infant interactions is controversial as it sates that certain people may be at a

disadvantage for certain reasons. ie. Mothers going back to work... Outline three research

studies into the role of the father -(correct answer)Schaffer found that initially babies become

attached to their mother (7 months) and then after this form secondary attachments with others

such as the father. 75% of babies had an attachment with their father by 18 months of age,

they showed separation anxiety. Lamb indicated that between the ages of 15-24 months they

will show a preference towards their father, this suggests that the father may become the PCG.

Grossman conducted a longitudinal study and found a direct correlation between the quality of

fathers play with infants and the quality of adolescent attachments. This suggests that the

father may be more about play and stimulation whereas the mother is more about nurturing.

Evaluate research into the role of the father -(correct answer):( - It is very difficult to draw one

conclusion from all the research as some psychologists have looked to prove he father as the

PCG and others have tried to prove him as the secondary caregiver. :( - MacCallum and

Golombrok found contradicting evidence as they found that children growing up in single or

same sex parent families did not develop any differently to those in opposite sex parents. :( -

Alternative explanations about why fathers don't usually become the PCG could be because of

traditional gender roles that people don't like to break as it is not seen as normal and thus they

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