At CES 2019, L’Oreal won the award for best innovation in
wearable technology for their product,...
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At CES 2019, L’Oreal won the award for best innovation inwearable technology for their product, My Skin Track pH. Thescientific and medical communities have long known the link betweenskin pH and common skin concerns, yet there has never been aconsumer-friendly way to measure it. My Skin Track pH is thefirst-ever, wearable sensor and companion app to measure personalskin pH levels and create customized product regimens to bettercare for skin. Using microfluidics technology, the sensor capturestrace amounts of sweat to provide an accurate skin pH reading.Conventional methods for reading pH levels include swabbing theskin for sweat and using a bulky digital pH meter. Researchers knowthat both methods provide accurate data,but were not sure whichwould provide results faster. A sample of seven subjects werebrought in and each tested both methods. The data is shownbelow.
Subject ID
My SkinTrack pH (sec)
Conventional method (sec)
AX120
151
110.6
JT635
156
127.9
IP894
141.5
122.6
SB260
115.7
134.9
EJ789
140.3
139.9
AS696
200.2
102.0
NC510
179.5
121.5
Using a significance level of 0.05,does one method provide results that are significantly faster?
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SolutionState the hypotheses The first step is tostate the null hypothesis and an alternative hypothesisNull hypothesis ud 0Alternative hypothesis ud 0Note that these hypotheses constitute a twotailed test Thenull hypothesis will be rejected if the difference
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