A researcher was commissioned to find out the proportion of students who use mobile phones in online learning. The company who commissioned the researcher wanted to know with 99% confidence the true proportion of students who are actually using smartphone es. How many samples should be surveyed if the past survey showed that 475 of 500 students are using smartphones?

Q: In a recent poll, 420 people were asked if they liked dogs, and 9% said they did. Find the Margin of…

A: Given: Sample size=n=420,Number of people who liked dogs:x=420×9100=37.8≈38,Significance…

Q: In a recent poll, 260 people were asked if they liked dogs, and 9% said they did. Find the margin of…

A:

Q: b. In the year 2000, a survey of 1189 U.S. adults were asked who they felt was the greatest…

A: Given,n=2000x=331p^=xnp^=3312000=0.16551-p^=1-0.1655=0.8345α=1-0.90=0.1α2=0.05Z0.05=1.645…

Q: A poll of 1027 adults in a certain country found that 55% identified themselves as the followers of…

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Q: In a survey of 464 registered voters, 143 of them wished to see Mayor Paz lose her next election.…

A:

Q: b. In the year 2000, a survey of 1103 U.S. adults were asked who they felt was the greatest…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: I will use excel to solve this problem.…

Q: A 99% confidence interval (with n = 1, 018) estimates the actual mean amount of data usage a month…

A: It is given that, the 99% confidence interval is (5.701, 6.599).

Q: ) Find the 90% confidence interval of the mean time for all composition papers when σ = 2.5 minutes.…

A: Given: Sample size, n = 40 Sample mean, x¯ = 12.6 Standard deviation, σ = 2.5

Q: In a survey of 2313 adults, 714 say they believe in UFOs.   Construct a 90% confidence interval for…

A: Given, In a survey of 2313 adults, 714 say they believe in UFOs. n=2313 x=714 Sample proportion:…

Q: b. In the year 2000, a survey of 977 U.S. adults were asked who they felt was the greatest…

A:

Q: A researcher is interested in constructing a 99% confidence interval for the proportion of Alzheimer…

A: Given Information :  A researcher is interested in constructing a 99% confidence interval for the…

Q: A random sample of 360 medical doctors showed that 106 had a solo practice. As a news writer, how…

A: Obtain the percentage of medical doctors in solo practice. The percentage of medical doctors in solo…

Q: In a recent poll, 310 people were asked if they liked dogs, and 40% said they did. Find the Margin…

A: Given data: n = 310p⏞ = 40100=0.40C.I = 99%      =0.99Then, calculate αα = 1-0.99   =0.01Now,…

Q: Of 380 randomly selected medical students, 21 said that they planned to work in a rural community.…

A:

Q: when 282 college students are randomly selected and surveyed, it is found that 109 own a car. find a…

A: It is given that sample size (n) is 282 and x is 109.

Q: In 2007, the CDC reported that approximately 6.6 per 1000 (0.66%) children were affected with autism…

A:

Q: In a recent poll, 300 people were asked if they liked dogs, and 71% said they did. Find the Margin…

A:

Q: in a recent poll, 130 people were asked if they liked dogs, and 46% said they did. Find the Margin…

A: Introduction: The 100 (1 – α) % confidence interval for the population proportion, p is: Here, n is…

Q: A marketing firm wanted to estimate the true proportion of protected homes today that have a home…

A: Given Data: n=280p∧=0.69   As "n" is large enough we will use normal approximation to calculate…

Q: A researcher was commissioned to find out the proportion of students who use mobile phones in online…

A: Given: X=475N=500ME=0.01CI=0.99

Q: A 97% confidence interval for proportion is found to be (.221,.623) the margin of error is what

A: The 97% confidence interval for proportion is given as (0.221, 0.623)

Q: In a survey of 1000 randomly selected adults in the US, participants were asked what their most…

A:

Q: In a recent poll, 270 people were asked if they liked dogs, and 29% said they did. Find the Margin…

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Q: Suppose we have the results of a Gallup survey (simple random sampling) which asks participants for…

A:

Q: In 2009, 33% of Americans felt that one parent should stay home to raise the children instead of…

A: Given,n=1015x=416p^=xnp^=4161015=0.4099α=1-0.99=0.01α=0.01

Q: To construct the confidence interval, the quantity tsm is subtracted from and added to the sample…

A: Given:

Q: In a recent poll, 480 people were asked if they liked dogs, and 48% said they did. Find the Margin…

A: Solution: From the given information, p-hat=0.48 and n=480. The confidence level is 0.90.

Q: poll found that 329 out of 763 adults said they would travel to outer space in their lifetime, given…

A: Given: n= 763 ,x= 329 At 92.0 % confidence level , z score= 1.751 Need to find confidence interval…

Q: a​ poll, ​37% of the people polled answered yes to the question​ "Are you in favor of the death…

A:

Q: In a recent poll, 530 people were asked if they liked dogs, and 95% said they did. Find the margin…

A: Given, n=530 p=0.95 Confidence level = 0.95 Critical value for 95% confidence level is 1.96.

Q: What is the correct interpretation of this confidence interval

A: The 99% confidence interval for the proportion of all students at this school who have their names…

Q: A recent Gallup Poll interviewed a random sample of 1523 adults. Of these, 868 bought a lottery…

A: Margin of error is used to measure the error occurred in the sample. It explains the percentage of…

Q: Suppose you are with a health agency that wants to estimate what percentage of Ohioans really has…

A: Given that the margin of error is 2%=0.02 Confidence level is 95% Therefore, the significance level…

Q: In a recent poll, 390 people were asked if they liked dogs, and 33% said they did. Find the Margin…

A: Given p^=Sample proportion=0.33 n=sample size=390 Confidence interval = 99%

Q: A study found that a 95% confidence interval for the mean μ of a particular population was computed…

A: Given, 95% confidence interval 10 ± 4  Sample size  = 1200         To write the conclusion regarding…

Q: In January 2010, a Gallup Poll asked a random sample of adults, “In general, are you satisfied or…

A: Given,n=1025x=256p^=xnp^=2561025=0.251-p^=1-0.25=0.75α=1-0.90=0.1α2=0.05z0.05=1.645

Q: b. In the year 2000, a survey of 1171 U.S. adults were asked who they felt was the greatest…

A:

Q: Students in an elementary school both boys and girls were asked if they are willing to write a…

A: Note: Hi, thank you for the question. As per our company guideline we are supposed to answer only…

Q: In a recent poll, 380 people were asked if they liked dogs, and 75% said they did. Find the margin…

A:

Q: A television sports commentator wants to estimate the proportion of citizens who follow professional…

A: Given that Critical value: Using the z-table, the critical value at 96% confidence level is

Q: Suppose we estimated that 68 percent of Santa Fe students believe that black coffee is disgusting.…

A:

Q: In a recent poll, 570 people were asked if they liked dogs, and 14% said they did. Find the margin…

A: From the Standard Normal Table, the z value for 95% level is 1.96.

Q: Camille believes that 50% of first-time brides in the United States are younger than their grooms.…

A:

Q: A study found that 13% of Americans have seen or sensed the presence of an angel. A contingent…

A:

Q: In a recent poll 240 people were asked if they like dogs and 75% said they did.  find the margin of…

A: Given :  Sample size = n = 240  sample proportion =  The Margin of Error (ME) is calculated…

Q: An economist wants to know if the proportion of the children in the United States that speak a…

A: It is given that sample proportion p-hat is 0.22 and the margin of error is 0.02.

Q: A college believes that 26% of applicants to that school have parents who have remarried. How large…

A:

Q: b. In the year 2000, a survey of 894 U.S. adults were asked who they felt was the greatest…

A: Givenn=894x=194p^=xn=194894=0.2170Confidence interval = 99%