(c) What is a 95% CI for the standard deviation of the lifetime distribution? [Hint: What is the standard deviation of an exponential random variable?] (Round your answers to two decimal places.) 3.4520 x 6.0192 x years
(c) What is a 95% CI for the standard deviation of the lifetime distribution? [Hint: What is the standard deviation of an exponential random variable?] (Round your answers to two decimal places.) 3.4520 x 6.0192 x years
Chapter6: Exponential And Logarithmic Functions
Section6.8: Fitting Exponential Models To Data
Problem 3TI: Table 6 shows the population, in thousands, of harbor seals in the Wadden Sea over the years 1997 to...
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KINDLY ANSWER THE LAST ITEM (c)
![A random sample of n = 15 heat pumps of a certain type yielded the following observations on lifetime (in years):
1.2 6.0 1.6
5.4 0.4 1.0 5.3
2.0
15.8 0.7 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 95% CI for expected (true average) lifetime. (Round your answers to two decimal places.)
6.72
X
× ) years
1.71
(b) How should the interval of part (a) be altered to achieve a confidence level of 99%?
O A 99% confidence level requires using a new value of n to capture an area of 0.1 in each tail of the chi-squared distribution.
O A 99% confidence level requires using a new value of n to capture an area of 0.005 in each tail of the chi-squared distribution.
ⒸA 99% confidence level requires using critical values that capture an area of 0.005 in each tail of the chi-squared distribution.
O A 99% confidence level requires using critical values that capture an area of 0.1 in each tail of the chi-squared distribution.
(c) What is a 95% CI for the standard deviation of the lifetime distribution? [Hint: What is the standard deviation of an exponential random variable?] (Round your answers to two decimal places.)
3.4520
x 6.0192
X years](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff88cb2ec-9620-4132-9b3d-55b25de3b1b6%2Fcfd68cc2-c353-420a-a51e-d0f3ecc52942%2Fclex2oi_processed.png&w=3840&q=75)
Transcribed Image Text:A random sample of n = 15 heat pumps of a certain type yielded the following observations on lifetime (in years):
1.2 6.0 1.6
5.4 0.4 1.0 5.3
2.0
15.8 0.7 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 95% CI for expected (true average) lifetime. (Round your answers to two decimal places.)
6.72
X
× ) years
1.71
(b) How should the interval of part (a) be altered to achieve a confidence level of 99%?
O A 99% confidence level requires using a new value of n to capture an area of 0.1 in each tail of the chi-squared distribution.
O A 99% confidence level requires using a new value of n to capture an area of 0.005 in each tail of the chi-squared distribution.
ⒸA 99% confidence level requires using critical values that capture an area of 0.005 in each tail of the chi-squared distribution.
O A 99% confidence level requires using critical values that capture an area of 0.1 in each tail of the chi-squared distribution.
(c) What is a 95% CI for the standard deviation of the lifetime distribution? [Hint: What is the standard deviation of an exponential random variable?] (Round your answers to two decimal places.)
3.4520
x 6.0192
X years
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