Question
In: Statistics and Probability
Question 12 A simple random sample of 12 e-readers of a certain type had the following...
Question 12
A simple random sample of 12 e-readers of a certain type had the following minutes of battery life.
287, 311, 262, 392, 313, 263, 293, 316, 286, 301, 287, 291
Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 62. What is the upper bound of the 95% confidence interval for the battery life for all e-readers of this type?
Round your answer to one decimal places (for example: 319.4). Write only a number as your answer. Do not write any units.
Question 15
A random sample of 13 students were asked how long it took them to complete a certain exam. The mean length of time was 109.5 minutes, with a standard deviation of 68.2 minutes. Find the lower bound of the 90% confidence interval for the true mean length of time it would take for all students to complete the exam.
Round to one decimal place (for example: 108.1). Write only a number as your answer. Do not write any units.
Solutions
Expert Solution
Question 12
----------------------------------------------------------------------------------------------------------------
Since population standard deviation is unknown and sample size (n) is less than 30, Use students t-distribution.
orchestra answered 10 months agoRelated Solutions
A simple random sample of 12 e-readers of a certain type had the following minutes of...
A simple random sample of 12 e-readers of a certain type had the
following minutes of battery life. 287, 311, 262, 392, 313, 304,
346, 316, 286, 274, 278, 291 Assume that it is reasonable to
believe that the population is approximately normal and the
population standard deviation is 63. What is the upper bound of the
95% confidence interval for the battery life for all e-readers of
this type? Round your answer to one decimal places (for example:
319.4)....
A simple random sample of 12 e-readers of a certain type had the following minutes of...
A simple random sample of 12 e-readers of a certain type had the
following minutes of battery life. 287, 311, 262, 392, 313, 260,
320, 316, 286, 256, 303, 291 Assume that it is reasonable to
believe that the population is approximately normal and the
population standard deviation is 76. What is the upper bound of the
95% confidence interval for the battery life for all e-readers of
this type? Round your answer to one decimal places (for example:
319.4)....
A random sample of n = 15 heat pumps of a certain type yielded the following...
A random sample of n = 15 heat pumps of a certain type
yielded the following observations on lifetime (in years):
2.0
1.4
6.0
1.9
5.2
0.4
1.0
5.3
15.6
0.9
4.8
0.9
12.4
5.3
0.6
(a) Assume that the lifetime distribution is exponential and use
an argument parallel to that of this example to obtain a 95% CI for
expected (true average) lifetime. (Round your answers to two
decimal places.)
,
years
(b) How should the interval of part...
A random sample of n = 15 heat pumps of a certain type yielded the following...
A random sample of n = 15 heat pumps of a certain type
yielded the following observations on lifetime (in years):
2.0
1.4
6.0
1.6
5.1
0.4
1.0
5.3
15.7
0.7
4.8
0.9
12.3
5.3
0.6
Assume that the lifetime distribution is exponential and use an
argument parallel to that of this example to obtain a 95% CI for
expected (true average) lifetime. (Round your answers to two
decimal places.)
( , ) years
What is a 95% CI...
A random sample of n = 15 heat pumps of a certain type yielded the following...
A random sample of n = 15 heat pumps of a certain type yielded
the following observations on lifetime (in years):
2.0 1.2 6.0 1.9 5.1 0.4 1.0 5.3 15.6 0.9 4.8 0.9 12.2 5.3 0.6
a.) Assume that the lifetime distribution is exponential and use
an argument parallel to that of this example to obtain a 96% CI for
expected (true average) lifetime (round answer to two decimal
places)
(________, _________) years
c.) What is a 95% CI for...
A random sample of n = 15 heat pumps of a certain type yielded the following...
A random sample of n = 15 heat pumps of a certain type
yielded the following observations on lifetime (in years):
2.0
1.4
6.0
1.8
5.3
0.4
1.0
5.3
15.9
0.8
4.8
0.9
12.1
5.3
0.6
(a) Assume that the lifetime distribution is exponential and use
an argument parallel to that of this example to obtain a 95% CI for
expected (true average) lifetime. (Round your answers to two
decimal places.)
,
years
(b) How should the interval of part...
In a simple random sample of 70 automobiles registered in a certain state, 26 of them...
In a simple random sample of 70 automobiles registered in a
certain state, 26 of them were found to have emission levels that
exceed a state standard. Can it be concluded that less than half of
the automobiles in the state have pollution levels that exceed the
standard? Find the P-value and state a conclusion. Round the answer
to four decimal places.
- The P-value is : _____
- We can conclude that less than half of the
automobiles in...
5) In a simple random sample of 59 electronic components produced by a certain method, the...
5) In a simple random sample of 59 electronic components
produced by a certain method, the mean lifetime was 1,114 hours.
Assume the component lifetimes are normally distributed with
population standard deviation 55 hours. What is the upper bound of
the 95% confidence interval for the mean lifetime of the
components? Round to nearest integer.
6) Efficiency experts study the processes used to manufacture
items in order to make them as efficient as possible. One of the
steps used to...
In a simple random sample of 70 automobile dealers registered in a certain state, 30 of...
In a simple random sample of 70 automobile dealers registered in
a certain state, 30 of them were found to have emission levels that
exceeded a state standard. At the 95% confidence interval, the
proportion of automobiles whose emissions exceeded the state
standard is closest to?
In a simple random sample of 70 automobile dealers registered in a certain state, 30 of...
In a simple random sample of 70 automobile dealers registered in
a certain state, 30 of them were found to have emission levels that
exceeded a state standard. At the 95% confidence interval, the
proportion of automobiles whose emissions exceeded the state
standard is closest to
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- write a thesis Ottomans, the Safavids, and Mughals more alike or different
- A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is...
- The increasing number of competitors, which leads to the decline in the business profits of ABC...
- 1. Major television networks have never seemed to have issues showing commercials for beer and other...
- 1. How do you define a project? Would you like to be a project manager? Why?
- Provide four examples of how a human resources manger can use the expectancy theory to positive...
- calculate percent of total assets. Please show excel calculations. Common Size Balance Sheets 12 Months Ended...
ADVERTISEMENT