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Unformatted text preview: nt Gigi and got times.
Suppose reading times are Normal with st dev 6 sec. is there
good evidence that the mean time for Gigi is greater than 22
seconds? The population of interst is adults who use the font
named Gigi. We want to know if the mean reading time is greater
than 22 seconds. Ho:u=22 seconds, Ha:u(not=) 22 seconds,
where u= mean reading time for font Gigi. Since we know st dev,
we can perform a one sample z test. We are not told SRS,
therefore we have to assume this sample of adults is
representative of the pop of interest. Stated Normality.
Independence- must assume these 25 are independent of one
another, assume at least 10(25) that read font Gigi. Z= x bar – uo/
st dev/sq root n. z= (27.088-22)/(6/sq root 25)=4.24. P value= .
000011. a mean time of 27.088 would almost never occur if Gigi
did not affect the reading time. This is very strong evidence that
it takes more time to read text in Gigi. I would reject the null hypothesis, the data suggests is takes more t...
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