From July 5-7, 2017, the Gallup Organization asked a random sample of 1,021 adults– aged 18 and older living in the United States and Washington D.C. – “In general, how harmful do you feel secondhand smoke is to adults?” and found that 59% believe that secondhand smoke is very harmful. The margin of sampling error was ±4 percentage points at the 95% confidence level. Calculate a 95% confidence interval for the percentage of all adults - aged 18 and older living in the United States and Washington D.C.- who believe that second smoke is very harmful.  % to  %

Q: In a survey, 8 people were asked how much they spent on their child's last birthday gift. The…

A: The sample size, i.e., the sampled number of people, n=8.The sample mean, x¯=$37.The sample standard…

Q: A national air traffic control system handled an average of 47,189 flights during 29 randomly…

A: The sample size is 29The sample mean is 47189The sample standard deviation is 6351We have to…

Q: Find the margin of error at a 90% confidence level.

A:

Q: find the sample size needed to estimate the percentage of democrats who have tattoos. Use a 0.05…

A:

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A poll for a statewide election has a margin of error of 2.14 percentage points. How many voters…

A: From the provided information,Margin of error (E) = 0.0214Confidence level = 99%

Q: confidence inferval for the actual percentage of students who want to pursue a college course.…

A: here from given  n = sample size  = 600 x= no of student expressed interest to purchase a college…

Q: In a survey, 26 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests.”   The…

A: Formula for the sample size needed to estimate a population proportion is

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: According to a survey, 66% of all students in the U. S. own a laptop. For a simple random sample of…

A: It is given that, According to a survey, 66% of all students in the U. S. own a laptop i.e. the…

Q: standardized achievement tests to nationwide samples of 17-year-olds in school. One year, the tests…

A: Sample size (n)=6000Sample proportion (p)=0.952We have to find 95% confidence interval for the…

Q: A couple wants to rent an unfurnished apartment room in New York next month. The mean monthly rent…

A:

Q: In 2003, an organization surveyed 1,500 adult Americans and asked about a certain war, "Do you…

A: Given , (1-α)100% = 90% α =0.1 Zc=Zα =NORMSINV(0.1) = -1.28

Q: Among the 34,506 people who​ responded, 63​% answered​ "yes."   Use the sample data to construct a…

A: Given data: Total number of people who responded for the question presented by online site, n =…

Q: A Pew Internet poll asked 4272 U.S. adults about their use of smart watches and fitness trackers. A…

A: Given,n=4272X=897

Q: Pew Research Center survey asked a variety of science questions of independent rande public…

A: The value of z at 98% confidence level is 2.326, which can be obtained by using the standard normal…

Q: In 2003, an organization surveyed 1,510 adult Americans and asked about a certain war, "Do you…

A: given data year 2003 n1 = 1510    x1 = 1080p^1 = x1n1 = 10801510 = 0.7152year 2008 n2 = 1510    x2 =…

Q: On September 14, 2000, a cross-sectional survey of 24,000 residents of a western state revealed that…

A: Given: n = 24000 Number of tuberculosis cases X = 145 Proportion p^ = Xn Formula Used: Confidence…

Q: In​ 2003, an organization surveyed 1,500 adult Americans and asked about a certain​ war, "Do you…

A: From the provided information,Confidence level = 90%

Q: A recent study asked U.S. adults to name 10 historic events that occurred in their lifetime that…

A: We have given that,  Sample proportion (p̂) = 76% = 0.76 and sample size (n) = 2025 Then,  We will…

Q: search for the Ford Motor Company, you find that a random sample of 800 households includes 721 in…

A: At 98% confidence level, the z value is 2.33 which can be obtained by using the standard normal…

Q: In 2003, an organization surveyed 1,510 adult Americans and asked about a certain war, "Do you…

A: We have given that,  For 2003 :- X1 = 1086 and n1 = 1510 For 2008 :- X2 = 580 and n2 = 1510 Then,…

Q: It is believed that slightly over 50% of Americans own pets. A 95% confidence interval for the…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: a 90 percent confidence interval for a population mean indicates that

A: Given problem Given that     a 90 percent confidence interval for a population mean indicates…

Q: A poll for a statewide election has a margin of error of 3.59 percentage points. How many voters…

A: given data  E = 0.0359 90% ci for p  n = ?

Q: In 2003, an organization surveyed 1,510 adult Americans and asked about a certain war, "Do you…

A: In 2003, the sample size n1 = 1510, number of Americans stated that US made the right decision X1=…

Q: In a random sample of 575 American goods, about 46.3% of them were transported by rail in 2017.…

A: Given,   Sample size = 575 Sample proportion = 0.463   Critical value: Using z-table, the z-critical…

Q: Your professor wishes to estimate the proportion of ALL high school students enrolled in…

A:

Q: In 2015 as part of the General Social Survey, 1131 randomly selected American adults responded to…

A:

Q: If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25 create and…

A: Given,   Sample size = 550 Sample proportion = 0.64   Critical value: Using z-table, the z-critical…

Q: In a survey, 31 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: Sleep apnea: Sleep apnea is a disorder in which there are pauses in breathing during sleep. People…

A: Sample size  n = 433Number of people aged 65 and over had sleep apnea(x) = 107

Q: What is the best estimate for the standard error of the sampling

A: Given data,Tota no of students n=14795Who said yes for cyberbullied is x=2219Point estimate is…

Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 13 Sample mean (x̄) = 50 Sample standard deviation…

Q: In a sample of 95 recommendations, it is found that 56% of them made money. Determine the upper…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

Q: Given a confidence interval  (0.08, 0.22),  what is the margin of error?

A: The confidence interval is (0.08, 0.22).

Q: College tuition: A simple random sample of 35 Colleges and universities in the united states had a…

A: Given,sample size(n)=35sample mean(x¯)=18702standard deviation(s)=10653degrees of…

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.