general exam tips Flashcards

1
Q

why do the standard deviations differ

A

different groups have different spreads of data around the mean

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2
Q

what does it mean when the standard deviations overlap

A

-the data is not significant - so there is no significant difference in the values

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3
Q

what does it mean when the standard deviations dont overlap

A

-the data is significant - there is a significant difference between the means

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4
Q

estimate the value of the correlation coeffeicent of a postive correlation

A

-close to +1
-so between 0.5 and 0.99

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5
Q

estimate the value of a negative correlation coefficient

A

-close to 0
-0 to 0.5

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6
Q

sugegst some considerations that should have been taken into account to ensure that the study was reliable

A

-large sample size
-chose ppl randomly
-chose ppl with a range of ages
-equal number of males and females
-repeat readings/measurements

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7
Q

why do the shapes/size in the image appear to be different comapred to each other and in real life

A

shape- tissue has been treated/killed/damaged
size-cut through different sections/planes

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8
Q

patients recorded the intensity of pain, suggest two reasons why it was
important to use a statistically valid scale.

A
  1. (Sensation of) pain is subjective
    OR
    Pain sensitivity/threshold/tolerance varies;
  2. To ensure that differences (in pain detection)
    were (statistically) significant
    OR
    For (valid) comparison;
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9
Q

Suggest what the scientist should do to ensure that he has removed all the water from
the sample.

A
  1. Weigh and heat;
  2. (Until) mass is constant;
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