hypothesis Flashcards

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1
Q

state the hypothesis

A
  1. assuming sth to be true

two sided - when we have a equal sign
one sided - when we have >

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2
Q

statistic test

A
  1. we identify test a hypothesis with many types of test (ex. t test)
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3
Q

specify the level of significance

A
  1. depends of seriousness of making a misteake

type I error (alfa) = if we reject the H0 and it happend to be positive (flase positive)

type II error (beta)= if we fail to reject the Ho and it happend to be false (false negative)

as alfa increases beta deacreses. decrease both is to be done while decrease n

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4
Q

state the decision h0

A
  1. we reject if:
    2 tail - |test stat|>|crit value|
    1 tail
    right = test stat > crit value
    left = test stat < crit value
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5
Q

t-stat

A

when alfa
xśr-H0/(sd/n^1/2)

or

when 1-alfa
xśr=+/- crit value*(sd/n^1/2)

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6
Q

test statistic

A

odpowiedni wzór w zalezności co chcemy policzyć (t)

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7
Q

critical value

A

excel function:
T.INV(x:n-1)
x depends what tail we have but its alfa or 1-alfa

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8
Q

right tail (5%)

A

95% of the area is on the left

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9
Q

left tail

A

95% is on the right

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10
Q

which test

A

depend on a data

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11
Q

how to do it

A
  1. state the hypothesis (h0;ha)
  2. identify apropriate test
  3. specify the level of significance (alfa; beta)
  4. state the decision rule (critical values)
  5. calculate test stat
  6. make the decision (reject or not)
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12
Q

parametric testing

A

for mean and st dev;
distributional assumptions

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13
Q

non parametric testing

A
  1. with not distributional assumtpions
  2. when outliers
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14
Q

h0 (nuul)

A
  1. we hope to reject the null
  2. null is always equal

wartość tak jakby nie było testu.

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15
Q

ha (alternative)

A
  1. we hope to accept the alternative
  2. alternative is always not equal

wartość którą testujemy

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16
Q

level of significance

A

alfa

17
Q

level of confidence

A

1-alfa

18
Q

magnitude

A