1)There are two cases Dark and Light. These two are predictor variables and BMI is the explanatory variable. It's a randomized experiment as we are doing an experiment on mice using an input variable which is the presence of light or not.
4)
> mean(light)
[1] 6.732
> mean(dark)
[1] 4.11375
> sd(light)
[1] 2.965733
> sd(dark)
> length(light)
[1] 10
> length(dark)
[1] 8
DATA 4.1 Does Light at Night Affect Weight Gain? Numerous studies have shown that exposure to lig...
In Data 4.1 on page 258, we examine a study in which mice were randomly assigned to either a normal light/dark cycle or to have a light on around the clock. According to the paper describing that study, "The global increase in the prevalence of obesity and metabolic disorders coincides with the increase of exposure to light at night." The study is examining whether light at night plays a causal role in the obesity epidemic. In Data 4.1, we examine...
For questions 13-16: Light exposure in mice Studies show that night-time light exposure is hamful to human health. A recent 6-week study randomly assigned lab mice to one of three conditions: LD (Group 1) had a standard light/dark cycle cach 24-hour period; (Group 2) LL had bright light all the time, and (Group 3) DM had dim light when there nomally would have been darkness. The rescarchers hoped to investigate how light exposure interacts with eating and sleeping cycles and...
Chapter 8, Section 1, Exercise 033 LIGHT AT NIGHT MAKES FAT MICE Studies have shown that exposure to light at night is harmful to human health. A study in mice shows that light at night has an effect on weight gain after just three weeks. In the study, mice were randomly assigned to live in one of three light conditions: LD had a standard light/dark cycle, LL had bright light all the time, and DM had dim light when there...
In addition to monitoring weight gain, food consumed, and activity level, the study measured stress levels in the mice by measuring corticosterone levels in the blood (higher levels indicate more stress.) Conditions for ANOVA are met and computer output for corticosterone levels for each of the three light conditions is shown. Level N Mean StDev DM LD LL 10 73.40 67.49 8 70.02 54.15 9 50.83 42.22 One-way ANOVA: Corticosterone versus Light SourceDF SS MS F P Light 2 2713...
Perhaps the difference in weight gain between the two groups was affected by a difference in food consumption. Conduct a hypothesis test for a difference in mean consumption between the two groups. Is there evidence of a significant difference in average food consumption betweern the two groups?
You are testing the claim that having lights on at night increases weight gain (abstract). A sample of 10 mice lived in an environment with bright light on all of the time and 8 mice who lived in an environment with a normal light/dark cycle is given below. Test the claim using a 6% level of significance. Assume the population variances are unequal and that the weight changes are normally distributed. Give answers to 3 decimal places. Data available at...
the questions for the table for number 14 was added For questions 13-16: Light exposure in mice Studies show that night-time light exposure is hamful to human health. A recent 6-week study randomly assigned lab mice to one of three conditions: LD (Group 1) had a standard light/dark cycle cach 24-hour period; (Group 2) LL had bright light all the time, and (Group 3) DM had dim light when there nomally would have been darkness. The rescarchers hoped to investigate...
(5 points) Weight gain during pregnancy. In 2004, the state of North Carolina released to the public a large data set containing information on births recorded in this state. This data set has been of interest to medical researchers who are studying the relationship between habits and practices of expectant mothers and the birth of their children. The following histograms show the distributions of weight gain during pregnancy by 840 younger moms (less than 35 years old) and 128 mature...
16 points) Weight gain during pregnancy. In 2004, the state of North Carolina released to the public a large data set containing information on births recorded in this state. This data set has been of interest to medical researchers who are studying the relationship between habits and practices of expectant mothers and the birth of their children. The following histograms show the distributions of weight gain during pregnancy by 844 younger moms (less than 35 years old) and 135 mature...
6. A two-tailed hypothesis test for a repeated-measures research design Previous studies have shown that playing video games can increase visual perception abilities on tasks presented in the gaming zone of the screen (within 5 degrees of the center). A graduate student is interested in whether playing video games increases peripheral visual perception abilities or decreases attention to peripheral regions because of focus on the gaming zone. For his study, he selects a random sample of 81 adults. The subjects...