Question
In: Statistics and Probability
2. The average time it takes to take a stats test is 1.13 hours. I wish...
2. The average time it takes to take a stats test is 1.13
hours. I wish to test to see if the last 8 exams had a time that
was different from normal. The average time to do the 8 exams was
1.2 hours with a standard deviation of .4 hours.
a) At the .05 level did the last exams take times that were of
different length (p = .64)
b) Interpret the p-value
c) Find and interpret the 95% confidence interval (computer
gives” .866- 1.534”)
d) If I take another of 8 exams would an average time of 1.3
hours be something I would expect to get? Explain
Solutions
orchestra answered 2 years agoRelated Solutions
The average time it takes to complete a particular sociology test is 86.5 minutes. In a...
The
average time it takes to complete a particular sociology test is
86.5 minutes. In a recent study of 26 individuals that took it a
particular test the average amount of time to complete the
sociology test was 83.4 minutes. The sample standard deviation was
8.7 minutes. At the 0.10 level of significance can it be concluded
that the average amount of time it takes to complete the particular
sociology test is less than 86.5 minutes.
Question 1 a). i. To estimate the average time it takes to assemble a certain printer...
Question 1
a). i. To estimate the average time it takes to assemble a certain
printer component,
the industrial engineer at an electronics firm timed 40 technicians
in the performance
of this task, getting a mean of 12.73 minutes and a standard
deviation of 2.06
minutes. Construct a 98% confidence interval for the true average
time it takes to
assemble the printer component.
ii. A sample of 16 girls gave a mean mass of 35 kg and a standard
deviation...
Question 1 a). i. To estimate the average time it takes to assemble a certain printer...
Question 1
a). i. To estimate the average time it takes to assemble a
certain printer component, the industrial engineer at an
electronics firm timed 40 technicians in the performance of this
task, getting a mean of 12.73 minutes and a standard deviation of
2.06 minutes. Construct a 98% confidence interval for the true
average time it takes to assemble the printer component.
ii. A sample of 16 girls gave a mean mass of 35 kg and a
standard dev...
We wish to give a 95% confidence interval for the mean time it takes to complete...
We wish to give a 95% confidence interval for the mean time it
takes to complete a routine assembly task. To this end we obtain a
random sample of 100 assembly times. We obtain a sample mean value
of 15 minutes with a sample standard deviation of 5 minutes. Give
the point estimate of the population average assembly time
The length of time, in hours, it takes an "over 40" group of people to play...
The length of time, in hours, it takes an "over 40" group of
people to play one soccer match is normally distributed with a mean
of 2.2 hours and a standard deviation of 0.55 hours. A sample of
size n = 80 is drawn randomly from the population. Find the
probability that the sample mean is between 2.1 hours and 2.4
hours.
The data presented below were collected on the amount of time, in hours; it takes an...
The data presented below were collected on the amount of time,
in hours; it takes an employee, to process an order at a local
plumbing wholesaler.
2.8
4.9
0.5
13.2
14.2
8.9
3.7
15.2
11.2
13.4
5.5
10.2
1.1
14.2
7.8
4.5
10.9
8.8
18.2
17.1
Construct a stem-and-leaf display of the data.
Construct a frequency distribution of the data
Construct cumulative frequency and cumulative percent
distributions of the data
Construct a frequency histogram of the data.
Determine the percentage...
The length of time, in hours, it takes an "over 40" group of people to play...
The length of time, in hours, it takes an "over 40" group of
people to play one soccer match is normally distributed with a mean
of 4 hours and a standard deviation of 0.5 hours. A sample of size
n = 50 is drawn randomly from the population. Find the probability
that the sample mean is between 3.5 hours and 4.1 hours.
Assume that it takes a worker three hours of labor time to paint a room and...
Assume that it takes a worker three hours of labor time to paint
a room and eight hours to sand a floor. Suppose that a second
worker (same productivity as the first worker) became available.
Now what would be the opportunity cost of painting four rooms?
Please Explain in detail.
At LIU, they wish to test whether the mean working hours/week of students in LIU Beirut...
At LIU, they wish to test whether the mean working hours/week of
students in LIU Beirut is
higher than the mean working hours/week of students in Bekaa
campus. A sample was taken
from each campus and the details were reported in the table
below.
Beirut students (1) Bekaa students (2)
Population standard deviation σ1 = 6 σ2 =5
Sample Mean x̄1 = 35 x̄2 = 30
Sample size n1 = 40 n2 = 40
a. Can you conclude, at α...
An electronic product takes an average of 8 hours to move through an assembly line. If...
An electronic product takes an average of 8 hours to move
through an assembly line. If the standard deviation of 0.7 hours,
what is the probability that an item will take between 7.3 and 8.3
hours to move through the assembly line? Do not round until you get
your your final answer. Answer= (Round your answer to 4 decimal
places, and report a probability value between 0 and 1.)
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