Quiz6-2016FS-Key.pdf

# Quiz6-2016FS-Key.pdf - ELI'~ Quill cfw_1 W 4 To assess the...

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Unformatted text preview: ELI ‘ ;-:'~“ Quill, {1/ W" 4‘ To assess the accuracy of a thermostat, the temperature reading on the thermometer is repeatedly recorded a total of 25 times and the sample mean is computed to be 20 °C. Suppose the thermostat readings are normally distributed with unknown mean [I and known standard deviation 0’ = 05°C . 1. Find 95% CI. for y and the margin of error for the C.I.. (Nor [hag 6:05 ﬁzz/denial 'x'ni gilﬁ : with! 5% :wmyé => (ﬁlm, 204%} ME 2 \$0.174 2. If you would like to decrease the width of current margin of error for the 95% conﬁdence interval, what would you do? 3. How large should n be so that a 95% conﬁdence interval for ,1! would have a margin of error as 0.l°C ? CF (“3802777 ”l A , «X L [317me :qJ’Uq’ ...
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