43. According to a 2010 study conducted by the Toronto-based social media analytics G Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted (Sysomos website, January 5, 2015). Suppose we randomly select 100 twet What is the expected number of these tweets with no reaction? b. What are the variance and standard deviation for the number of these tweets with no a. reaction?

43. According to a 2010 study conducted by the Toronto-based social media analytics G Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted (Sysomos website, January 5, 2015). Suppose we randomly select 100 twet What is the expected number of these tweets with no reaction? b. What are the variance and standard deviation for the number of these tweets with no a. reaction?

Name: 43. According to a 2010 study conducted by the Toronto-based social m
Uploaded: 2024-03-20T07:07:00.000Z
Channel: Bartleby
Description: 43. According to a 2010 study conducted by the Toronto-based social media analvtics fSysomos, 71% of all tweets get no reaction. That is, these are tweets that are not renliedor retweeted (Sysomos website, January 5, 2015). Suppose we randomly selec

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Related questions

Q: What cutoff score(s) should be used? ±3.356 ±2.447 ±3.708 +1.943

A: The degrees of freedom is, df=n1+n2-2=4+4-2=6 The degrees of freedom is 6.

Q: An urn contains 2 white balls and 8 red balls. A second urn contains 6 white balls and 4 red balls.…

A: If the ball is white, the probability that the second urn was selected is obtained below:

Q: 3. In 1988 Wood, et al, did a study. Eighty-nine sedentary men were given one of two treatments.…

A: Diet:Sample size Sample mean Sample standard deviation Exercise:Sample size Sample mean Standard…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given α=0.10n1=200x1=26.3s1=5.2n2=200x2=17.6s2=2.8

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: (a) The degrees of freedom is,…

Q: Suppose 18% of movie-goers say that horror is their favorite movie genre. If a random sample of…

A: Obtain the mean number of movie-goers that prefer horror movie genre. The mean number of movie-goers…

Q: A technology manufacturing company has recently switched to the production of isolinear processors.…

Q: According to a 2017 Wired magazine article, 40% of emails that are received are tracked using…

A: Let "X" be the number of these emails that are tracked using software that can tell the email sender…

Q: Several researchers have found that evaluating the internal control procedures of an organization by…

A: Margin of error (E):The margin of error for sample mean is given by,

Q: ow. difference of the means is in the interval. e of the means is in the interval. difference…

A: Given Data : For group 1 x̄1 = 21.4 n1= 200 s1= 3.3 For group 2…

Q: a study in which two groups of students were asked to answer 42 trivia questions from a board game.…

A: Given that, For group 1 :23.84.1200For group 2 :18.54.4200We have to find the 95% confidence…

Q: 4 An LED lightbulb manufacturer produces lights with a mean lifespan of 10,000 hours and a standard…

A: Given information- Population mean µ = 10,000 hours Population standard deviation, σ = 1,000 hours…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given data We have given the data from two groups of students- Population 1 Population 2…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: given data group 1x¯1 = 25s1 = 4.5n1 = 200group 2x¯2 =19.6s2 = 4.3n2 = 20095% ci for μ1-μ2here i…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given that

Q: 3) 62% of kids are bummed that winter break is over. What would be the standard deviation of the…

A: Dispersion is a measure which used to measure the variability in the set of observations. Dispersion…

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: Given that, the 200 students in group 1 had a mean score of 24.1 with a standard deviation of 3.7,…

Q: a florist ahs a floral shop in miami and anotherin san diego. Teh miami shop has a mean daily…

A: We need to compute the z-score to find out which store had the better sales.

Q: Trent Capital Management has 240 full-time employees who are currently covered under the company's…

A: Pet X be the trent capital management n=30,σ=575=standard deviation, μ=2080=mean

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

A: The mean and standard deviation for group 1 are x1=22sd1=3.5n1=200 The mean and standard deviation…

Q: a Pew research center survey ask adults in the United States which technology would be very hard to…

A: It has been given that 2000 users have been emailed or surveyed. Thus, we have, n = sample size =…

Q: 5. A certain calculator circuit board is manufactured in lots of 200. If 1% of the the boards are…

A: Since the probability is fixed, we will apply binomial distribution here.

Q: Two researchers conducted a study in which two groups of students were asked to answer 42 trivia…

Q: A restaurant sells four different sizes of soft drinks: kids (12 ounces for $0.85), small ( 14…

A: Normal Distribution: A continuous random variable X is said to follow Normal distribution with…

Q: Fake Twitter followers: Many celebrities and public figures have Twitter accounts with large numbers…

A: We have given that, Mean (x̄) = 13.1 with standard deviation (σ) = 10.1 and sample size…

Q: A report states that the mean yearly salary offer for students graduating with mathematics and…

A: According to the given information in this question, we need to answer all the parts

Q: b. between 2 According to Cardweb.com the mean bank credit card debt for households FE07 was $7868…

Q: Suppose a paper reported that the freshman year weight gain for the students in a representative…

Concept explainers

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

Topic Video

Question

43. According to a 2010 study conducted by the Toronto-based social media analvtics f
Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not renlied
or retweeted (Sysomos website, January 5, 2015). Suppose we randomly select 100 twe
What is the expected number of these tweets with no reaction?
b. What are the variance and standard deviation for the number of these tweets with no
a.
reaction?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

$Hypothesis Tests and Confidence Intervals for Proportions$

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, probability and related others by exploring similar questions and additional content below.

Similar questions

There are 24 students enrolled in an introductory statistics class at a small university. As an in-class exercise the students were asked how many hours of television they watch each week. The nm = 13 male students watched an average of 6 hours of television per week with standard deviation 4.24 hours. The ng = 11 female students watched an average of 3.91 hours of television per week with a standard deviation of 3.48 hours. Assume that the students enrolled in the statistics class are representative of all students at the university. The standard error of the differences , and x, is about SE = 1.667. Use the normal distribution to test, at the 5% level, if male students at this university watch, on average, more television than female students. Include all details of the test. z = i p-value = i There is evidence that males at this university watch significantly more television, on average, than female students.
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 22.4 with a standard deviation of 4.4, while the 200 students in group 2 had a mean score of 19.8 with a standard deviation of 4.1. Complete parts (a) and (b) below. (a) Determine the 90% confidence interval for the difference in scores, μ₁ −μ₂. Interpret the interval. The lower bound is The upper bound is (Round to three decimal places as needed.) Interpret the interval. Choose the correct answer below. OA. There is a 90% probability that the difference of the means is in the interval. B. The researchers are 90% confident that the difference of the means is in the interval. C. The…
7. Furnace repair bills are normally distributed with a mean of 267 dollars and a standard deviation of 20 dollars. If 74 of these repair bills are randomly selected, find the probability that they have a mean cost between 267 dollars and 269 dollars.
In bags of Happy Trail Mix, the number of raisins is skewed left with a mean of 33.6 and a standard deviation of 8.4, while in bags of a generic trail mix, the number of raisins is skewed right with a mean of 28.8 and a standard deviation of 12.7. What is the probability in a sample of 17 randomly selected Happy Trail Mix bags and a sample of 17 randomly selected generic bags that the mean number of raisins in the Happy Trail Mix is more than the mean number of raisins in the generic mix? approximately 0 0.0968 0.8219 0.9032
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 23.5 with a standard deviation of 4.3, while the 200 students in group 2 had a mean score of 17.7 with a standard deviation of 4.1. Complete parts (a) and (b) below. (a) Determine the 95% confidence interval for the difference in scores, μ1−μ2. Interpret the interval. The lower bound is __. The upper bound is ___ (Round to three decimal places as needed.) B Interpret the interval. Choose the correct answer below. A. The researchers are 95% confident that the difference of the means is in the interval. B. There is a 95% probability that the difference of the means is…
The Chartered Financial Analyst (CFA) designation is fast becoming a requirement for serious investment professionals. Although it requires a successful completion of three levels of grueling exams, it also entails promising careers with lucrative salaries. A student of finance is curious about the average salary of a CFA charterholder. He takes a random sample of 36 recent charterholders and computes a mean salary of $129,000 with a standard deviation of $22,000. Use this sample information to determine the 99% confidence interval for the average salary of a CFA charterholder. (You may find it useful to reference the t table. Round final answers to the nearest whole number.) Confidence interval
10. In a study conducted to determine the role that sleep disorders play in academic performance, researcher Jane Gaultney conducted a survey of 503 randomly selected students with a known sleep disorder (such as narcolepsy, insomnia, or restless leg syndrome) and found their mean GPA was 2.65 with a standard deviation of 0.87. Similarly, she randomly selected 1342 students with no known sleep disorders, and found their mean GPA to be 2.82 with a standard deviation of 0.83. You may assume that both population GPA's are normally distributed. Use a significance level of 0.05 to test whether the two groups have different mean GPA's. As a follow-up, construct and interpret a 95% confidence interval for the true difference in the mean GPA's of the two groups. What would be the type I and type II errors for this problem?
7. With a previous contractor, the mean time to replace a streetlight was 3.2 days. A city councilwoman thinks that the new contractor is not getting the streetlights replaced as quickly. She selects a random sample of 12 streetlight service calls for the new contractor, and obtains the following times to replacement (days). 6.2 7.1 5.4 5.5 7.5 2.6 4.3 2.9 3.7 0.7 5.6 1.7 Using a significance level of 0.01, test the councilwoman's claim. You may assume that all conditions are satisfied.
A. The salaries of pharmacy techs are normally distributed with a mean of $33,000 and a standard deviation of $4,000. If a pharmacy tech is selected at random, what is the probability they make more than $38,000? The answer should be typed as a decimal with 4 decimal places. B. The salaries of pharmacy techs are normally distributed with a mean of $33,000 and a standard deviation of $4,000. What is the minimum salary to be considered the top 6%? Round final answer to the nearest whole number. C. The average number of shoppers at a particular grocery store in one day is 505, and the standard deviation is 115. The number of shoppers is normally distributed. For a random day, what is the probability that there are between 250 and 450 shoppers at the grocery store? The answer should be typed as a decimal with 4 decimal places.
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 21.2 with a standard deviation of 4.1, while the 200 students in group 2 had a mean score of 17.5 with a standard deviation of 3.8. Complete parts (a) and (b) below. (a) Determine the 95% confidence interval for the difference in scores, H, - H2. Interpret the interval. The lower bound is The upper bound is (Round to three decimal places as needed.) Interpret the interval. Choose the correct answer below. O A. There is a 95% probability that the difference of the means is in the interval. O B. The researchers are 95% confident that the difference of the means is in the interval. O C. The…
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 24.9 with a standard deviation of 4.3, while the 200 students in group 2 had a mean score of 17.2 with a standard deviation of 3.4. Complete parts (a) and (b) below. (a) Determine the 95% confidence interval for the difference in scores, µ, - H2. Interpret the interval. The lower bound is The upper bound is. (Round to three decimal places as needed.)
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 26.3 with a standard deviation of 5.2, while the 200 students in group 2 had a mean score of 17.6 with a standard deviation of 2.8. Complete parts (a) and (b) below. (a) Determine the 90% confidence interval for the difference in scores, μ1−μ2. Interpret the interval. The lower bound is nothing. The upper bound is nothing. (Round to three decimal places as needed.)