In a study done in 2015, it was estimated that about 45% of the world’s population...
In a study done in 2015, it was estimated that about 45% of the
world’s population used some form of online social media. The
average time spent per day by social media users was found to be
2.22 hours per day, with a standard deviation of 0.425 hours.
Assume the distribution of this data to be normal. (10
marks)
a) What is the probability that a randomly chosen social media user spends more than 2.15 hours per day on social media? (4 marks)
b) What is the probability that the average time spent by a randomly selected group of 22 social media users is at most 2.15 hours? (3 marks)
c) What is the probability that the average time spent by a randomly selected group of 22 social media users is between 2.15 hours and 2.39 hours? (3 marks)
Homework Answers
Add Answer to:
In a study done in 2015, it was estimated that about 45% of the
world’s population...
In a study done in 2015, it was estimated that about 45% of the world’s population...
In a study done in 2015, it was estimated that about 45% of the world’s population used some form of online social media. The average time spent per day by social media users was found to be 2.49 hours per day, with a standard deviation of 0.515 hours. Assume the distribution of this data to be normal. a) What is the probability that a randomly chosen social media user spends more than 3.00 hours per day on social media? b)...
(5 points, 1 point each) According to survey data by Global Webindex, people spend an average...
(5 points, 1 point each) According to survey data by Global Webindex, people spend an average of 2 hours and 22 minutes (142 minutes) per day on social media. The sample standard deviation given was 43 minutes. Assume this data is normal distributed an answer the following questions. a. What is the probability that a randomly selected person spends more than 2 hours on social media? b. What is the probability that a randomly selected person spends exactly 90 minutes...
Researchers doing a study comparing time spent on social media and time spent on studying randomly...
Researchers doing a study comparing time spent on social media and time spent on studying randomly sampled 200 students at a major university. They found that students in the sample spent an average of 2.3 hours per day on social media and an average of 1.8 hours per day on studying. If all the students at the university in fact spent 2.2 hours per day on studying, with a standard deviation of 2 hours, the shape of the sampling distribution...
Social media and entertainment account for two-thirds of the time spent on mobile apps
Social media and entertainment account for two-thirds of the time spent on mobile apps, with those between 18 and 34 spending approximately two hours a day using social media and entertainment apps. Social media apps have become the primary platform for users to keep informed on news, culture, and their family and friends, while entertainment apps fill pockets of free time throughout the day. Provided is the average monthly time spent per mobile app user on social and entertainment categories...
The time college students spend on the internet follows a Normal distribution. At Johnson University, the...
The time college students spend on the internet follows a Normal distribution. At Johnson University, the mean time is 6 hours per day with a standard deviation of 1.5 hours per day. If 100 Johnson University students are randomly selected, what is the probability that the average time spent on the internet will be more than 6.2 hours per day? ____________ Round to 4 places. If 100 Johnson University students are randomly selected, what is the probability that the average...
Notation for hypothesis tests about a population mean Suppose you are conducting a study about how...
Notation for hypothesis tests about a population mean Suppose you are conducting a study about how the average US worker spends time over the course of a workday. You are interested in how much time workers spend per day on personal calls, emails, and social networking websites, as well as how much time they spend socializing with coworkers versus actually working. The most recent census provides data for the entire population of US workers on variables such as travel time...
U.S. internet users spend an average of 18.3 hours a week online. If 99% of users...
U.S. internet users spend an average of 18.3 hours a week online. If 99% of users spend between 13.2 and 23.4 hours a week, what is the probability that a randomly selected user is online less than 14 hours a week? Assume that internet usage follows a normal distribution. Round the final answer to four decimal places and intermediate z value calculations to two decimal places. The probability of a randomly selected person being online less that 14 hours per...
Question 3 A study of college freshmen's study habits found that the time (in hours) that...
Question 3 A study of college freshmen's study habits found that the time (in hours) that freshmen use to study each week follows a distribution with a mean of 7.2 hours and a standard deviation of 5.3 hours A) Can you calculate the probability that a randomly chosen freshman studies more than 9 hours? If so, do it. If not, explain why not. (4 points) B) What is the shape of the sampling distribution of the mean x for samples...
Please write neatly ? Problem 4 Four-year-olds in China average 5 unsupervised hours per day. Most...
Please write neatly ?
Problem 4 Four-year-olds in China average 5 unsupervised hours per day. Most of the unsupervised children live in rural areas, considered safe. Suppose that the amount of unsupervised time is normally distributed with standard deviation 1 A Chinese 4-year-old is randomly selected from a rural area. We are interested in the amount of time the child spends alone per day. In each appropriate box you are to enter either a rational number in "p/q" format or...
How Different? For this discussion, you will compare a group of acquaintances to the population in...
How Different? For this discussion, you will compare a group of acquaintances to the population in regards to social media use. Consider the following: Analyzes of national data have suggested that the adult population uses social media an average of 3 hours per day, with a standard deviation of 1 hour. Develop a main response in which you address the following: Ask a group of friends (or other acquaintances) how many hours they spent on social media the previous day....
(5 points, 1 point each) According to survey data by Global Webindex, people spend an average of 2 hours and 22 minutes (142 minutes) per day on social media. The sample standard deviation given was 43 minutes. Assume this data is normal distributed an answer the following questions. a. What is the probability that a randomly selected person spends more than 2 hours on social media? b. What is the probability that a randomly selected person spends exactly 90 minutes...
Researchers doing a study comparing time spent on social media and time spent on studying randomly sampled 200 students at a major university. They found that students in the sample spent an average of 2.3 hours per day on social media and an average of 1.8 hours per day on studying. If all the students at the university in fact spent 2.2 hours per day on studying, with a standard deviation of 2 hours, the shape of the sampling distribution...
Social media and entertainment account for two-thirds of the time spent on mobile apps, with those between 18 and 34 spending approximately two hours a day using social media and entertainment apps. Social media apps have become the primary platform for users to keep informed on news, culture, and their family and friends, while entertainment apps fill pockets of free time throughout the day. Provided is the average monthly time spent per mobile app user on social and entertainment categories...
Question 3 A study of college freshmen's study habits found that the time (in hours) that freshmen use to study each week follows a distribution with a mean of 7.2 hours and a standard deviation of 5.3 hours A) Can you calculate the probability that a randomly chosen freshman studies more than 9 hours? If so, do it. If not, explain why not. (4 points) B) What is the shape of the sampling distribution of the mean x for samples...
Please write neatly ?
Problem 4 Four-year-olds in China average 5 unsupervised hours per day. Most of the unsupervised children live in rural areas, considered safe. Suppose that the amount of unsupervised time is normally distributed with standard deviation 1 A Chinese 4-year-old is randomly selected from a rural area. We are interested in the amount of time the child spends alone per day. In each appropriate box you are to enter either a rational number in "p/q" format or...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago