Light at Night and Weight Gain A study found that mice exposed to light at night gained substantially more weight than mice who had complete darkness at night, despite the fact that calorie intake and activity levels were the same for the two groups. How large is the effect of light on weight gain? In the study, 27 mice were randomly divided into two groups. The 8 mice with darkness at night gained an average of 5.9 grams in body mass, with a standard deviation of 1.9 grams. The 19 mice with light at night gained an average of 9.4 grams with a standard deviation of 3.2 grams. We see in Figure 1 that there is no extreme skewness or extreme outliers, so it is appropriate to use at-distribution. 6 8 10 12 14 16 18 BM Gain Figure 1 Does light at night affect body mass gain? Find a 90% confidence interval for the difference in mean weight gain u – Hp.where u2 represents the mean weight gain of the mice in light and 4 represents the mean weight gain of the mice in darkness. Round your answers to two decimal places. The 90% confidence interval is to

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Light at Night and Weight Gain
A study found that mice exposed to light at night gained substantially more weight than mice who had
complete darkness at night, despite the fact that calorie intake and activity levels were the same for the two
groups. How large is the effect of light on weight gain? In the study, 27 mice were randomly divided into two
groups. The 8 mice with darkness at night gained an average of 5.9 grams in body mass, with a standard
deviation of 1.9 grams. The 19 mice with light at night gained an average of 9.4 grams with a standard
deviation of 3.2 grams. We see in Figure 1 that there is no extreme skewness or extreme outliers, so it is
appropriate to use a t-distribution.
:
:
6
8
10
12
14
16
18
BM Gain
Figure 1 Does light at night affect body mass gain?
Find a 90% confidence interval for the difference in mean weight gain 4z – HD. where HL represents the
mean weight gain of the mice in light and Ho represents the mean weight gain of the mice in darkness.
Round your answers to two decimal places.
The 90% confidence interval is !
to
...
..
D.
Light/Dark
Transcribed Image Text:Light at Night and Weight Gain A study found that mice exposed to light at night gained substantially more weight than mice who had complete darkness at night, despite the fact that calorie intake and activity levels were the same for the two groups. How large is the effect of light on weight gain? In the study, 27 mice were randomly divided into two groups. The 8 mice with darkness at night gained an average of 5.9 grams in body mass, with a standard deviation of 1.9 grams. The 19 mice with light at night gained an average of 9.4 grams with a standard deviation of 3.2 grams. We see in Figure 1 that there is no extreme skewness or extreme outliers, so it is appropriate to use a t-distribution. : : 6 8 10 12 14 16 18 BM Gain Figure 1 Does light at night affect body mass gain? Find a 90% confidence interval for the difference in mean weight gain 4z – HD. where HL represents the mean weight gain of the mice in light and Ho represents the mean weight gain of the mice in darkness. Round your answers to two decimal places. The 90% confidence interval is ! to ... .. D. Light/Dark
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