Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is...
Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 24.3 months. The standard deviation is 2.6 months. If a company provides its 32 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.7 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population and the correction factor can be ignored. Round the final answer to at least four decimal places and intermediate z-value calculations to two decimal places.
Homework Answers
Add Answer to:
Cell Phone Lifetimes A recent study of the lifetimes of cell
phones found the average is...
A study of cell phone users found that of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be % for those not using cell phones. Complete parts (a) and (b).
A study of 420,065 cell phone users found that 131 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0331% for those not using cell phones. Complete parts (a) and (b).
The average lifetime of smoke detectors that a company manufactures is 5 years, or 60 months,...
The average lifetime of smoke detectors that a company manufactures is 5 years, or 60 months, and the standard deviation is 6 months. Find the probability that a random sample of 35 smoke detectors will have a mean lifetime between 59 and 62 months. Assume that the sample is taken from a large population and the correction factor can be ignored. Round the final answer to four decimal places and intermediate z-value calculations to two decimal places P (59 <...
A study of 420,058 cell phone users found that 135 of them developed cancer of the...
A study of 420,058 cell phone users found that 135 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0318% for those not using cell phones. a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. ___ % < p < ___ % (Round...
A study of 420069 cell phone users found that 136 of them developed cancer of the...
A study of 420069 cell phone users found that 136 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0418% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. (Round to three...
One study was conducted to determine whether the average age of a mobile phone is normally...
One study was conducted to determine whether the average age of a mobile phone is normally distributed with an estimated 5-year average population and a standard deviation of 1.4 years. If a random sample of 18 cellphones is taken. a. Determine the average age of mobile phones more than 5 years 6 months. b. Determine the average age of the mobile phone between 5.5 to 6 years.
A study of 420,062 cell phone users found that 132 of them developed cancer of the...
A study of 420,062 cell phone users found that 132 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0346 % for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. __% <...
Life of Smoke Detectors The average lifetime of smoke detectors that a company manufactures is 5...
Life of Smoke Detectors The average lifetime of smoke detectors that a company manufactures is 5 years or months, and the standard deviation is 7 months. Find the probability that a random sample of 29 smoke detectors will have a mean lifetime between 56 and 63 months. Assume that the sample is taken from a large population and the correction factor can be ignored. Round the final answer to at least four decimal places and intermediate z-value calculations to two...
Life of Smoke Detectors The average lifetime of smoke detectors that a company manufactures is 5...
Life of Smoke Detectors The average lifetime of smoke detectors that a company manufactures is 5 years or months, and the standard deviation is 7 months. Find the probability that a random sample of 29 smoke detectors will have a mean lifetime between 56 and 63 months. Assume that the sample is taken from a large population and the correction factor can be ignored. Round the final answer to at least four decimal places and intermediate z-value calculations to two...
7.1.23 Question Help A study of 420,070 cell phone users found that 133 of them developed...
7.1.23 Question Help A study of 420,070 cell phone users found that 133 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0338% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system....
Study of 420,096 cell phone users
A study of 420,096 cell phone users found that 135 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0339% for those not using cell phones. Complete parts (a) and (b).a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system.nothing%<p<nothing%(Round to three decimal places as needed.) b. Will...
The average lifetime of smoke detectors that a company manufactures is 5 years, or 60 months, and the standard deviation is 6 months. Find the probability that a random sample of 35 smoke detectors will have a mean lifetime between 59 and 62 months. Assume that the sample is taken from a large population and the correction factor can be ignored. Round the final answer to four decimal places and intermediate z-value calculations to two decimal places P (59 <...
7.1.23 Question Help A study of 420,070 cell phone users found that 133 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0338% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system....
Most questions answered within 3 hours.
-
Consider the reaction, C3 H8 + O2 --> CO2 + H2O. How many
moles of O2...
asked 21 minutes ago -
You and your opponent both roll a fair die. If you both roll the
same number,...
asked 38 minutes ago -
In a study of the accuracy of fast food drive-through orders,
Restaurant A had 257 accurate...
asked 38 minutes ago -
Identify and describe in detail the four categories of
institutions that could be included in a...
asked 43 minutes ago -
In python
class Customer:
def __init__(self, customer_id, last_name, first_name, phone_number, address):
self._customer_id = int(customer_id)
self._last_name =...
asked 51 minutes ago -
What is an example of a limitation in implementing a new
ERP system and how it...
asked 46 minutes ago -
In a section of 9.7cm of an artery with a radius of 2.6mm there
is a...
asked 47 minutes ago -
the two carboxylic acid groups of aspartic acid have different
acidities with pKa values of 2.1...
asked 51 minutes ago -
Would CuCO3 aqueous salt combined with calcium chloride
form a solid precipitate? If so, what would...
asked 50 minutes ago -
How do ECM Solutions assist in embedding a culture of continuous
improvement in an organization? (Project...
asked 1 hour ago -
Directions
These directions introduce the idea of Essential Questions.
Since this may be a new concept...
asked 1 hour ago -
1.b. Fiscal policy is said to suffer from ‘crowding out’.
Explain what this means and why...
asked 1 hour ago