Basic Stats
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| useful graph | show 🗑
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| useful numbers | show 🗑
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| show | x ̅=1/N ∑_((i=1))^N▒xi
preferable for approximately normal data
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| formula for median | show 🗑
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| formula for standard deviation | show 🗑
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| formula for IQR | show 🗑
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| show | more than 1.5 x IQR lower than Q1
more than 1.5 x IQR higher than Q3
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| show | transformation of a variable from x to xnew
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| examples of linear transformation use | show 🗑
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| show | xnew=a+bx
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| formula for new mean once linear transformation has occurred | show 🗑
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| formula for new median once linear transformation has occurred | show 🗑
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| formula for new standard deviation once linear transformation has occurred | show 🗑
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| formula for new IQR once linear transformation has occurred | show 🗑
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| density curves | show 🗑
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| show | 1
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| show | normal curve can be used if a histogram looks like a normal curve
termed 'reasonable'
must start at 0 and end at 0
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| show | if in a straight line, or close to it, then normal and assumption is reasonable
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| 68-95-99.7% rule | show 🗑
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| symbol for the mean of a density curve | show 🗑
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| show | σ
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| show | X = random variable
N = normal distribution
first number in brackets = mean
second number in brackets = standard deviation
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| show | Z
corresponds to the area under the curve of the corresponding region
will always be to the left
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| standard normal distribution table | show 🗑
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| show | P(Z<c)
c = right of Z
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| show | N(μ,σ)
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| show | Z= (X-μ)/σ
used when distribution is N(0,1)(is normal but needs proportions changed)
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| show | 1-sample test for μ when σ is unknown
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| show | Cl for μ
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
Nymphette
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