Question
In: Statistics and Probability
Use R studio to answer the following. A study was carried out to investigate the variation...
Use R studio to answer the following.
- A study was carried out to investigate the variation of rainbow trout weights in a certain creek. The weights (in kilograms) of 10 randomly selected fish are listed below:
0.78, 0.45, 0.35, 0.76, 0.57, 0.42, 0.33, 0.68, 0.66, 0.42
Assume that the population is approximately normally distributed. Hint: make a vector to enter the weight data into R, e.g.:
> wt = c(0.78, ..., 0.42)
- Find the 90% confidence interval for the unknown population variance.
- What is the meaning of this interval? Write a sentence describing it.
- Test the hypothesis that the unknown population variance is less than 0.08 kg2 at a=0.05. Be sure to list (i) your hypotheses, (ii) test statistic, (iii) decision, and (iv) conclusion.
Solutions
orchestra answered 2 years agoRelated Solutions
Use R to solve the following problem: A study was carried out to investigate the variation...
Use R to solve the following problem: A study was carried out to
investigate the variation of rainbow trout weights in a certain
creek. The weights (in kilograms) of 10 randomly selected fish are
listed below: 0.78, 0.45, 0.35, 0.76, 0.57, 0.42, 0.33, 0.68, 0.66,
0.42
Assume that the population is approximately normally
distributed. Test the hypothesis that the unknown population
variance is less than 0.08 kg2 at alpha=0.05. Be sure to list (i)
your hypotheses, (ii) test statistic, (iii)...
1. Basic use of R/R Studio. Solve the following problem in R and print out the...
1. Basic use of R/R Studio. Solve the following problem
in R and print out the commands and outputs.
(a) Create a vector of the positive odd integers less than 100;
Remove the values greater than 60 and less than 80; Find the
variance of the remaining set of values
(b) What’s the difference in output between the commands 2*1:5
and (2*1):5? Why is there a difference?
(c) If you wanted to enter the odd numbers from 1 to 19...
Question 1 (18 marks) A pharmaceutical company carried out a study to investigate if men and...
Question 1
A pharmaceutical company carried out a study to investigate if
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density lipoprotein (HDL) type of cholesterol. This is the type of
cholesterol that is labelled “good” as it helps prevent coronary
disease. A small volunteer sample of men and women aged 40-45 of
general good health was taken as a preliminary trial. Their blood
HDL cholesterol levels (mg/dL) were measured with the following
results:
MALE:...
A ["prospective", OR "retrospective"] cohort study is carried out to investigate the association between occupational arsenic...
A ["prospective", OR "retrospective"] cohort
study is carried out to investigate the association between
occupational arsenic inhalation and neurological exposure and
neurological effects among workers in a copper smelter. For the
sake of simplicity, let’s assume there are two possible exposure
categories: high and low (for example, those working in the
smelting process and those working in administration). The exposure
was carefully assessed by review of company records which reflected
very good exposure monitoring (both air sampling and urine
testing)....
An experiment was carried out to investigate the effect of species (factor A, with I =...
An experiment was carried out to investigate the effect of
species (factor A, with
I = 4)
and grade (factor B, with
J = 3)
on breaking strength of wood specimens. One observation was made
for each species—grade combination—resulting in SSA = 443.0, SSB =
424.6, and SSE = 125.4. Assume that an additive model is
appropriate.
(a)
Test
H0: α1 =
α2 = α3 =
α4 = 0
(no differences in true average strength due to species)
versus
Ha:...
An experiment was carried out to investigate the effect of species (factor A, with I =...
An experiment was carried out to investigate the effect of
species (factor A, with I = 4) and grade (factor B, with J = 3) on
breaking strength of wood specimens. One observation was made for
each species—grade combination—resulting in SSA = 444.0, SSB =
424.6, and SSE = 122.4. Assume that an additive model is
appropriate. (a) Test H0: α1 = α2 = α3 = α4 = 0 (no differences in
true average strength due to species) versus Ha:...
Please Use R studio to answer the question. This is the Statistics section of Comparing Groups....
Please Use R studio to answer the question.
This is the Statistics section of Comparing Groups.
One month before the election, a poll of 630 randomly selected
votes showed 54% planning to vote for a certain candidate. A week
later, it became known that he had had an extramarital affair, and
a new poll showed only 51% of 1010 voters supporting him. Do these
results indicate a decrease in voter support fo his candidacy?
a) Test an appropriate hypothesis as...
please use R studio to answer the following questions 1. An eductional theorist collects behavioural data...
please use R studio to answer the following questions
1. An eductional theorist collects behavioural data from two
groups of children in an early childhood center. She measures how
much time the children are active (e.g. running or swinging on the
monkey bars) in minutes. The first group of children are encouraged
to run about and as such are expected to be active; the second
group is encouraged to sit still and paint, and are expected to be
less active....
Using R-Studio please answer the following questions and show your code. 1. Julie buys a take-out...
Using R-Studio please answer the following questions and show
your code.
1. Julie buys a take-out coffee from one of two coffee shops on
a random basis: Ultimo Coffee and Joe’s Place. This month, she
measured the temperature of each cup immediately after purchase,
using a cooking thermometer. Sample data is shown below,
temperatures are in Fahrenheit.
ultimo = c(171,161,169,179, 171,166,169,178,171,
165,172,172)
joes = c(168,165,172, 151,162,158,157,160, 158,160,158,164)
State the null and alternative hypothesis in your own
words.
What type of statistical...
Use R studio to answer the following questions location 1 location 2 63.9 66.8 71.3 63.8...
Use R studio to answer the following
questions
location 1
location 2
63.9
66.8
71.3
63.8
70.6
60.7
54.6
66.2
63.7
59.5
61
59.5
69.8
66.1
72.4
64.6
64.4
64.8
69.8
61.6
65.6
61.3
62.8
64.9
63.6
66.2
Temperatures are extremely variable in sections of the Colorado
River near the Glen Canyon Dam. Researchers measure
temperature in two locations (1 and 2) with samples of size
n1 = 10 and n2 = 16, and
calculate variances of s12 = 20 °C...
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