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Re: How many maple trees had a diameter greater than 49.4 cm ? [#permalink]
why did you consider it as normal distribution?
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Re: How many maple trees had a diameter greater than 49.4 cm ? [#permalink]
greenmonomer wrote:
why did you consider it as normal distribution?


Because that is the only Distribution asked by ETS in GRE
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How many maple trees had a diameter greater than 49.4 cm ? [#permalink]
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Actually when data is skewed, interquartile range and median are better parameters of descriptive stats than mean and variation. IMO, this question is missing a point about normal distribution. Hence, the assumption about normal distribution is the only way to solve it. Otherwise, there is no way to establish a link between mean and standard deviation. For normal distribution though, when we divide the difference between a mean and any variable by a standard deviation we get the standard normal distribution with mean=0 and standard deviation=1
KarunMendiratta wrote:
greenmonomer wrote:
why did you consider it as normal distribution?


Because that is the only Distribution asked by ETS in GRE
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Re: How many maple trees had a diameter greater than 49.4 cm ? [#permalink]
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KarunMendiratta wrote:
greenmonomer wrote:
why did you consider it as normal distribution?


Because that is the only Distribution asked by ETS in GRE


True, but if this were a QC question, we'd couldn't assume a normal distribution.
On test day, if we're not told a distribution is normal, we can't assume it to be so.
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Re: How many maple trees had a diameter greater than 49.4 cm ? [#permalink]
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