a study conducted by the pew research center reported that 58% of cell phone owners used...
a study conducted by the pew research center reported that 58% of cell phone owners used their phones for purchase guidance. A random sample of 15 cell phone owners is studied to understand how cell phones are used to make purchase decisions. define the random variable and find the mean and standard deviation
Homework Answers
Solution:
Random variable is a variable whose possible values outcomes are numerical outcomes of a random phenomenon.
This is an example of discrete random variable as we can count these number rather than measure.
Mean of distribution = no. Of sample * probability of success = 15*0.58 = 8.7
Standard deviation of distribution = sqrt(no.of sample*probability of success *probability of failure) = sqrt(15*0.58*0.42) = sqrt(3.654)= 1.91
Add Answer to:
a study conducted by the pew research center reported
that 58% of cell phone owners used...
J UULUTUSUIDS_URGJUFIObmltV3... What should I buy? A study conducted by a research group in a recent...
J UULUTUSUIDS_URGJUFIObmltV3... What should I buy? A study conducted by a research group in a recent year reported that 58% of cell phone owners used their phones inside a store for guidance on purchasing decisions. A sample of 15 cell phone owners is studied. Round the answers to four decimal places. Part 1 of 4 (a) What is the probability that seven or more of them used their phones for guidance on purchasing decisions? The probability that seven or more...
#32 Source: Air Care Colorado 31. Google it: According to a report of the Nielsen Company,...
#32
Source: Air Care Colorado 31. Google it: According to a report of the Nielsen Company, 67% of Internet searches in July 2013 used the Google search engine. Assume that a sample of 25 searches is studied. a. What is the probability that exactly 20 of them used Google? b. What is the probability that 15 or fewer used Google? c. What is the probability that more than 20 of them used Google? d. Would it be unusual if fewer...
A Pew Internet poll asked cell phone owners about how they used their cell phones. One...
A Pew Internet poll asked cell phone owners about how they used their cell phones. One question asked whether or not during the past 30 days they had used their phone while in a store to call a friend or family member for advice about a purchase they were considering. The poll surveyed 1007 adults living in the United States by telephone. Of these, 467 responded that they had used their cell phone while in a store within the last...
According to Pew Research Center 2011 study, a typical American teen owning a cell phone spends...
According to Pew Research Center 2011 study, a typical American teen owning a cell phone spends an average of 96 minutes a day text messaging. Assume normal distribution with a standard deviation of 33 minutes. a. What percent of teens send less than 75 minutes per day on text messaging? b. Find and interpret P75, the 75th percentile Problem #4 According to a recent study, the mean amount of sleep college students aged 17-24 get on a typical night is...
A Pew Internet poll asked cell phone owners about how they used their cell phones. One...
A Pew Internet poll asked cell phone owners about how they used their cell phones. One question asked whether or not during the past 30 days they had used their phone while in a store to call a friend or family member for advice about a purchase they were considering. The poll surveyed 1008 adults living in the United States by telephone. Of these, 469 responded that they had used their cell phone while in a store within the last...
The Pew Research Center conducts an annual Internet Project, which includes research related to social networking. The two‑way table shows the percent of cell phone owners who use a social networking...
The Pew Research Center conducts an annual Internet Project,
which includes research related to social networking. The two‑way
table shows the percent of cell phone owners who use a social
networking site on their phone, broken down by age, and is based on
data reported by Pew as of January 2014.
The Pew Research Center conducts an annual Internet Project, which includes research related to social networking. The two-way table shows the percent of cell phone owners who use a...
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...
1 questions According to a Pew Research Center study, in May 2011, 39% of all American...
1 questions
According to a Pew Research Center study, in May 2011, 39% of all American Type numbers in the boxes. adults had a smart phone (one which the user can use to read email and surf 10 points the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 448 community college students at random and finds that 188 of them have a smart phone. Then in testing the hypotheses: H:...
The Pew Research Center reported in 2018 that 68% of U.S. adults rated "reducing health care...
The Pew Research Center reported in 2018 that 68% of U.S. adults rated "reducing health care costs" as a national priority. This year a survey is conducted with a national sample of 1,505 U.S. adults selected by a combination of landline and cell phone random digit dials. This year's survey finds that 70% of the sample says that "reducing health care costs" is a national priority. We test the following hypotheses: H 0: The proportion of U.S. adults this year...
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.
J UULUTUSUIDS_URGJUFIObmltV3... What should I buy? A study conducted by a research group in a recent year reported that 58% of cell phone owners used their phones inside a store for guidance on purchasing decisions. A sample of 15 cell phone owners is studied. Round the answers to four decimal places. Part 1 of 4 (a) What is the probability that seven or more of them used their phones for guidance on purchasing decisions? The probability that seven or more...
#32
Source: Air Care Colorado 31. Google it: According to a report of the Nielsen Company, 67% of Internet searches in July 2013 used the Google search engine. Assume that a sample of 25 searches is studied. a. What is the probability that exactly 20 of them used Google? b. What is the probability that 15 or fewer used Google? c. What is the probability that more than 20 of them used Google? d. Would it be unusual if fewer...
The Pew Research Center conducts an annual Internet Project,
which includes research related to social networking. The two‑way
table shows the percent of cell phone owners who use a social
networking site on their phone, broken down by age, and is based on
data reported by Pew as of January 2014.
The Pew Research Center conducts an annual Internet Project, which includes research related to social networking. The two-way table shows the percent of cell phone owners who use a...
1 questions
According to a Pew Research Center study, in May 2011, 39% of all American Type numbers in the boxes. adults had a smart phone (one which the user can use to read email and surf 10 points the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 448 community college students at random and finds that 188 of them have a smart phone. Then in testing the hypotheses: H:...
Most questions answered within 3 hours.
-
An object in front of a concave mirror has a real image that is
11.5 cm...
asked 5 minutes ago -
Consider the reaction, C3 H8 + O2 --> CO2 + H2O. How many
moles of O2...
asked 1 hour ago -
You and your opponent both roll a fair die. If you both roll the
same number,...
asked 2 hours ago -
In a study of the accuracy of fast food drive-through orders,
Restaurant A had 257 accurate...
asked 2 hours ago -
Identify and describe in detail the four categories of
institutions that could be included in a...
asked 2 hours 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 2 hours ago -
What is an example of a limitation in implementing a new
ERP system and how it...
asked 2 hours ago -
In a section of 9.7cm of an artery with a radius of 2.6mm there
is a...
asked 2 hours ago -
the two carboxylic acid groups of aspartic acid have different
acidities with pKa values of 2.1...
asked 2 hours ago -
Would CuCO3 aqueous salt combined with calcium chloride
form a solid precipitate? If so, what would...
asked 2 hours ago -
How do ECM Solutions assist in embedding a culture of continuous
improvement in an organization? (Project...
asked 2 hours ago -
Directions
These directions introduce the idea of Essential Questions.
Since this may be a new concept...
asked 2 hours ago