PROABALITY AND SIG Flashcards

1
Q

if the stats test is not sig the null hypo is accepted

A
  • the null hypothesis states there is “no diff” or “no correlation” between the conditions
  • the stats test determinds which hypo is true and thus accepts or rejects
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2
Q

the null hypothesis is accepted or rejected at a particular lvl

A
  • probability is a measure of the likehood that a particular event will occur, where 0 is a stats impossibility and 1 is a stats certainty.
  • there are no stats certanties in psychology but there is a sig level - the point a which the null hypo is accepted or rejected.
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3
Q

P value

A
  • Probability refers to the likelihood of an event occurring. It can be expressed as a number (0.5)
  • general psychologists use a probability level of 0.05.
  • This means that there is a 5% probability that the results occurred by chance.
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4
Q

using tables of critical value

A
  • hypothesis one tailed (directional) or two tailed (non directional)
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5
Q

The usual level of significant is 0.05%

A
  • this means that 5% chance that the result in a particular study sample occurred
  • even if there was no real difference in the population
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6
Q

TYPE 1 ERRORS

A
  • error involves a researcher falsely rejecting the null hypothesis and therefore falsely suggests an experiment has found an effect when it hasn’t
  • OCCURS WHEN TOO HIGH E.G 0.05
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7
Q

TYPE II (false negative)

A
  • error is the opposite, where a researcher falsely accepts the null hypothesis and claims that there has been no effect found in an experiment when there has been.
  • OCCURS WHEN THE SIG LVL IS TOO LINEINT
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8
Q

what makes each error more likely

A
  • a type one is more likely to be made if the sig lvl is too lenient (too high e.g 0.1 or 10%)
  • a type 2 error is more likley if the sig lvl is too low (e.g 0.01 or 1%), as potentially sig values may be missed
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