A dermatologist believes that cancers of the head and neck will occur most often of the left side in adults in the US." In a review of 640 cases, 340 occurred on the left side. Test his belief to a confidence level of 95%.

Q: A federal report indicated that 22% of children ages 2 to 5 years had a good diet, an increase over…

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Q: A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that…

A: Given Data: n=150 x=48

Q: A recent study was conducted in which a random sample of men and a random sample of women were…

A: Given:  Confidence Interval = (0.133,0.207) = (13.3%, 20.7%)

Q: In a survey of 1250 U.S. adults, 363 said that their favorite sport to watch is football. The 95%…

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Q: A polling agency reported that 66 percent of adults living in the United States were satisfied with…

A: The 100 (1 – α)% confidence interval provides an interval estimation of the required population…

Q: If we want to be within 0.02 of the true proportion of homes that have a direct television receiver…

A: The population proportion is 82%, the confidence level is 98% and estimate is within 0.02.…

Q: A poll asked 1011 American adults if they believe there was a conspiracy in the assassination of…

A:

Q: 2. A nutritionist wants to know the population proportion of Grade 1 learners who eat vegetables.…

A: We have given thatn = 1200x = 200p̂ = x/n = 200/1200 = 0.167Significance level (α) = 1 - 0.95 = 0.05

Q: Public Policy Polling recently conducted a survey asking adults across the U.S. about music…

A: Given data  N = 571 X = 80 99% confidence interval

Q: A television station surveys 200 customers and finds that 23% of customers watch the evening news.…

A: Given data n=200 p=23% confidence level=99%

Q: A May 2000 Gallup poll found that 38% of a random sample of 1012 adults in the United States said…

A: (a)   Obtain the 96% confidence interval to estimate the true proportion of all U. S. adults who…

Q: In one of the studies, it was found that, in a random sample of 261 married persons, 135 were…

A:

Q: Kiyo is confused. He has constructed a 90% confidence interval for the average age of students at…

A: Answer: Given that:     Kiyo is confused. He has constructed a 90% confidence interval for the…

Q: England-based basketball team NewCastle Eagles wants to match their fans in two distinct countries.…

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Q: A magazine article conducted a survey of 1000 people in Washington State and found that 26% of the…

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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: A Gallup poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the…

A: As given: Sample proportion: p=80%=0.8 Population size: N=1001 Confidence interval= 95% The z-value…

Q: The maker of a cell phone screen protector would like to estimate the proportion of customers who…

A: The 96% confidence interval for the true proportion of customers who file a warranty claim is (0.15,…

Q: . If she wants to make a 95% confidence interval for the mean with the margin of error of 5 cm, at…

A: here from given information , σ = 17 cm MOE = 5cm here Z-critical for 95 % confidence level = 1.96…

Q: If α = 0.05, then what is the confidence level?

A: Given: α = 0.05   we know that, Confidence level+ α = 1

Q: A cable company claims that 88% of its customers are fully satisfied with their service. A…

A: Given that  Sample size n =350 Favorable cases x =287 Sample proportion p^=x/n  =287/350 =0.82

Q: A principal of a large high school wants to estimate the true proportion of high school students who…

A: Given that  Sample size n =50 95 % confidence interval.  (0.25 , 0.34 )

Q: A magazine provided results from a poll of 1500 adults who were asked to identify their favorite…

A: As we know confidence interval interpreted that we are that percent confident that it will contain…

Q: The principal of a school claims that 30% of Grade 3 pupils stay in the playground after their…

A: We have given that  Population proportion p=30%=0.30 ,sample size n=500, and alpha =0.05 Sample…

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…

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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: n 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the…

A: Given, confidence level = 1 - α = 0.98       To find, Z value for 98% confidence level.

Q: The police department wants to reduce the margin of error for their 95% confidence interval. If they…

A: Here Given  The police department wants to reduce the margin of error for their 95% confidence…

Q: According to a poll of Americans, 79% say that if they had the evidence they would turn in a…

A: It is given that n = 305.

Q: A tech company believes that the percentage of residents in the town XYZ that own a cell phone is…

A: Given: p=0.70x=130n=200 The sample proportion is obtained as below: p^=xn=130200=0.65 Hypothesis:…

Q: A pharmaceutical company is testing two distinct drugs to alleviate symptoms of a disease. In the…

A: Given information- Sample 1 - First drug Sample 2 - Second drug

Q: The same Gallup poll asked its 1523 adult respondents and also 501 teens (ages 13 to 17) whether…

A: No. of adult respondents=1523 No. of teen respondents=501 Percentage of adults responding yes to…

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: In a​ poll, 51​% of the people polled answered yes to the question​ "Are you in favor of the death…

A: Let p denote the proportion of people answered yes to the question. Let E denote the margin of…

Q: A CBS News poll conducted July 29–August 4, 2014, surveyed 1344 randomly selected American adults.…

A: Total number of American adults who participated in the CBS News poll survey=1344,Out of these…

Q: If there was a 95% confidence interval of say, (0.48, 0.68), about a product being preferred by…

A: The confidence interval at 100 (1 – α) % confidence level gives us an interval estimate about the…

Q: Yun is curious what proportion of users will click an advertisement that appears on his website. He…

A: We can use this formula to find the 99% confidence interval, p±zp1-pn

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: A 90% confidence interval for the difference between the proportion of college students who use…

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Q: Through polling, it was estimated that the percent of people who will vote for a particular…

A: Given information Percentage of people who will vote in a upcoming election p-hat = 36.2% Margin of…

Q: college professor would like to estimate the proportion of students who pull an "all-nighter,"…

A: Given: sample size(n)=100confidence level =99%confidence interval =(0.48,0.62)

Q: A sociologist is comparing the proportion of teenage boys who receive a text message at least once…

A: The  Conditions for the Confidence interval for the difference in population proportions • Samples…

Q: Which is true about a 95% confidence interval for a population proportion based on a given sample? A…

A: The given information about the 95% confidence interval for a population proportion.

Q: Suppose you compute a 93% confidence interval. What will happen to the confidence interval if you…

A: Increasing the confidence level increases the margin of error. This will increase the width or range…

Q: If 390 people were asked if they liked dogs, and 82% said they did What is the margin of error of…

A: The sample size is 390, proportion is 0.82. Computation of critical value:…

Q: A random sample of 340 college students were asked if they believed that places could be haunted,…

A:

Q: Flagstaff found 470 NAU students who drink coffee daily. Find a 95% confidence interval for the true…

A: Given

Q: Imagine that the confidence interval around a candidate's popularity score is [37.22,48.86],what is…

A: The confidence interval provides an estimated range of values that includes an unknown population…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.