Question
In: Statistics and Probability
A study was conducted to explore the effects of ethanol on sleep time. Fifteen rats were...
A study was conducted to explore the effects of ethanol on sleep time. Fifteen rats were randomized to one of three treatments. Treatment 1 got only water (control). Treatment 2 got 1g of ethanol per kg of body weight, and treatment 3 got 2g/kg of ethanol. The amount of REM sleep in a 24hr period was recorded, in minutes. Data are below:
Treatment 1: 63, 54, 69, 50, 72
Treatment 2: 45, 60, 40, 56
Treatment 3: 31, 40, 45, 25, 23, 28
a) Create 95% CIs for all pairwise comparisons of means using the Tukey method. Do this by hand and show your work. You may use R to check your answers. Summarize your results using letter codes. What do you conclude?
b) What would have been the multiplier if Fisher’s LSD method had been used? Bonferroni? Use a t table. You may check your answer in R. You do not need to make the complete CIs for this question, just give the values of the multipliers.
Solutions
orchestra answered 1 year agoRelated Solutions
A study was conducted to explore the effects of ethanol on sleep time. Fifteen rats were...
A study was conducted to explore the effects of ethanol on sleep
time. Fifteen rats were randomized to one of three treatments.
Treatment 1 got only water (control). Treatment 2 got 1g of ethanol
per kg of body weight, and treatment 3 got 2g ethanol per kg of
body weight. The amount of REM sleep in a 24hr period was recorded,
in minutes. Data are below: Treatment 1: 63, 54, 69, 50, 72
Treatment 2: 45, 60, 40, 56
Treatment...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one...
A study explored the effect of ethanol on sleep time. Fifteen
rats were randomized to one of three treatments. Treatment 1 was
water (control). Treatment 2 was 1g of ethanol per kg of body
weight, and Treatment 3 was 2g/kg. The amount of REM sleep (in
minutes) in a 24hr period was recorded:
Treatment 1
63
54
69
50
72
Treatment 2
45
60
40
56
Treatment 3
31
40
45
25
23
28
Are these data strong evidence REM...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one...
A study explored the effect of ethanol on sleep time. Fifteen
rats were randomized to one of three treatments. Treatment 1 was
water (control). Treatment 2 was 1g of ethanol per kg of body
weight, and Treatment 3 was 2g/kg. The amount of REM sleep (in
minutes) in a 24hr period was recorded: Treatment 1: 63, 54, 69,
50, 72 Treatment 2: 45, 60, 40, 56 Treatment 3: 31, 40, 45, 25, 23,
28 Are these data strong evidence REM...
A study explored the effect of ethanol on sleep time. Fifteen rats were randomized to one...
A study explored the effect of ethanol on sleep time. Fifteen
rats were randomized to one of three treatments. Treatment 1 was
water (control). Treatment 2 was 1g of ethanol per kg of body
weight, and Treatment 3 was 2g/kg. The amount of REM sleep (in
minutes) in a 24hr period was recorded: Treatment 1: 63, 54, 69,
50, 72 Treatment 2: 45, 60, 40, 56 Treatment 3: 31, 40, 45, 25, 23,
28 Are these data strong evidence REM...
Stress and weight in rats. In a study of the effects of stress on weight in...
Stress and weight in rats. In a study of the
effects of stress on weight in rats, 71 rats were randomly assigned
to either a stressful environment or a control (nonstressful)
environment. After 21 days, the change in weight (in grams) was
determined for each rat. The table below summarizes the data on
weight gain. Test the claim that stress effects weight. (Use a 10%
significance level.)
Group
n
Sample mean
Sample Standard Dev.
Stress
20
26
13.4
No stress...
A research study examined the effects of meditation on quality of sleep. Fifty individuals were asked...
A research study examined the effects of meditation on quality
of sleep. Fifty individuals were asked how many nights, on average,
they lost sleep at the beginning of the study. Then all fifty
individuals were placed into a meditation intervention every day
for three months. At the end of the three months, the same fifty
individuals were asked how many sleepless nights they had on
average. The mean difference between the before and after
intervention groups was 5.6 nights, with...
A sleep researcher conducted a study where 4 participants were instructed to count sheep and 4...
A sleep researcher conducted a study where 4 participants were
instructed to count sheep and 4 were told to concentrate on their
breathing and 4 were not given any special instruction. The average
number of minutes taken for each participants to fall asleep over
the next 7 days were 14, 18, 27, 31 minutes for the sheep counters.
25, 22, 17, 14 minutes for the breathing ones, and 45, 33, 30, and
41 for the control condition. using the .05...
2. Good sleep or bad sleep? ~ A study was conducted to identify the factors affecting...
2.
Good sleep or bad sleep? ~
A study was conducted to identify the factors affecting quality of
sleep for university students. A survey of 290 students of
different majors aged 17-29 years old revealed that 67.2% of these
students suffered from poor sleep.
a.
Create a 95% confidence interval for the
= the population proportion of university students aged 17-29 years
old who suffer from poor sleep.
Final answer:
( ______________________
, _____________________ )
b.
Determine whether each of...
To study the effectiveness of possible treatments for insomnia, a sleep researcher conducted a study with...
To study the effectiveness of possible treatments for
insomnia, a sleep researcher
conducted a study with 12 participants. Four participants were
instructed to count
sheep (the Sheep Condition), four were told to concentrate on their
breathing (the
Breathing Condition), and four were not given any special
instructions. Over the next
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fall asleep. The
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28, 27, and 31;...
__________________________ 1. A researcher is conducting a study on the effects of sleep on creativity. The...
__________________________
1. A researcher is conducting a study on the effects of sleep
on creativity. The creativity scores for three levels of sleep (4
hours of sleep, 8 hours of sleep, and 12 hours of sleep) for n = 5
participants (in each group) are presented below:
***Make sure you also ask SPSS for descriptive statistics of
this data. When you are in the one-way ANOVA dialog box where you
move variables to Factor and Dependent List, click on options...
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