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Z- Score formula

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Z = (X-M)/SD

Z = (X*M)/SD

Z = (M-X)/SD

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What are the two main causes of low reproducability in research?

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Statistical error

Publication bias

Skewed data

Type 1 errors

Low power, leading to inflated effect sizes

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What is the standard error forumula?

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SE = S / N squared

SE = S / square root N

SE = S * N squared

SE = S * square root N

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Which statements relate to Z-scores? (2 correct answers)

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How many standard deviations an element is from the mean

The location of the raw score in a distribution

A probability distribution

Shows the difference between 2 means

Compares unsystematic and systematic variation

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Which statements are true of Chi-square tests? (3)

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They measure an association between categorical data

They tell us whether the observed frequencies in our data are significantly different to the expected frequencies

They tell us whether the categories in our data differ significantly from eachother

They tell us where a particular score stands in relation to other scores

They tell us whether our sample differs from the population

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Z-scores have a mean of _?

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Check Answer

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Check All Answers

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Z-scores have a standard deviation of _?

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Check Answer

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What increases power?

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Homogeneity of variance

Low standard error

Increased effect size

Decreased population variance

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What is the Chi-square goodness of fit test formula?

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X²= ∑(observed-expected)²/expected

X² = ∑(expected-observed)²/observed

X² = ∑(expected-observed)²/expected

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The Chi-square goodness of fit test is used when there are how many variables?

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Check Answer

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What is b0?

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The slope of the regression line

Represents residuals on the regression line

The intercept of the regression line

The distribution of the residuals on the regression line

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What is the confidence intervals equation?

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X +- Z(S*square root N)

X +- Z/(S*square root N)

X +- Z(S/square root N)

X +- Z/(S/square root N)

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Chi-Square test for independence

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expected = column x row / overall total

expected frequency = overall total / column x row

expected frequency = observed - expected / observed

expected frequency = column - row / overall total

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What is the slope of the regression line?

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b1

The amount that Y will change for each 1 unit change of X

b0

The intercept of the regression line

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What type of data is used in a Chi-square test?

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Ratio

Categorical

Binary

Interval