A Gallup poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the respondents "strongly agree" that K-12 schools should teach critical thinking to children with a margin of error of ±3.2%. The confidence interval for this statistic is from  to  .

Q: Find the value of t a/2 for a 99% confidence interval when the sample size is 30

A: Given Confidence = 99% n=30

Q: A June 2020 Angus Reid poll of 1510 Canadian adults found that 53% support the idea of a 30 hour…

A: Given Data: p^=0.53n=1510   z-value corresponding to 95% Confidence level=1.96

Q: Strictly speaking, what is the best interpretation of a 95% confidence interval for the mean? If…

A: In general, the 95% confidence interval interprets that there is 95% confidence that the population…

Q: A random survey of 495 adults found that 59 had diabetes. Which of the following is a 98% confidence…

A:

Q: The results below are based on a sample of 20 employees selected to study the relationship between…

A: Dear students as per guidelines we answer the first question only when multiple different question…

Q: Based on the data shown in question 13, please Construct a 95% confidence interval for P1-P2, and…

A: Given that p1 & p2 denotes the proportion of women who detected early stage tumor through BSE…

Q: According to a Harris Interactive survey of 2401 adults conducted in April 2009, 25% of adults do…

A:

Q: In a sample of 100,40 said they preferred Pepsi to Coke. A 95% confidence interval for the…

A:

Q: he drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that…

A: a).

Q: Greece has faced a severe economic crisis since the end of 2009. A Gallup poll surveyed 1,000…

A:

Q: In a survey of 950 randomly selected individuals, 17% answered yes to the question "Do you think the…

A: Sample size, n = 950Probability = 17% = 0.17 90% confidence level

Q: A poll by Louis Harris and Associates took a random sample of 1249 adult Americans and asked whether…

A: Confidence interval is the interval to estimate the population unknown parameter. This confidence…

Q: In a recent questionnaire about home ownership, a random sample of 545 homeowners were asked about…

A: A random sample of 545 homeowners were asked about the rate of mortgage, whether that is fixed or…

Q: 1. In a recent poll 62 out of 149 randomly chosen students at Allen High School say they plan to buy…

A:

Q: A pew Poll conducted in 2013 surveyed a random sample of 2003 adult Americans, and 18% of them said…

A: The random variable X follows normal distribution. We have to construct 90% confidence interval.…

Q: In a sample of 100, 40 said they preferred Pepsi to coke. A 95% confidence interval for the…

A:

Q: A two-tailed hypothesis test for H0: μ = 20 at α = .05 is analogous to asking if a 95 percent…

A: Given: Level of significance =  α = 0.05  A two-tailed hypothesis test for H0: μ = 20  against H1:…

Q: What is the value of Z for this confidence interval?

A: Given,sample size(n)=14795no.of people who said yes=2219no.of people who said no =12576

Q: b. Construct a confidence interval suitable for testing the claim that the mean IQ scores for…

A: b. Here, medium lead level is the first sample and high-level lead is the second sample.   The…

Q: Researchers at Carleton University in Canada studied a random sample of 10 first-year students who…

A: Given Data : For Sample 1 x̄1 = 2.46 n1= 10 s1= 3.26 For Sample 2…

Q: he drug Viagra became available in the U.S. in May 1988, in the wake of an advertising campaign that…

A: A confidence interval estimate is an interval estimate that includes the unknown population…

Q: Using the accompanying colleges and universities data to find 95% confidence intervals for the…

A: Given:   Liberal Arts Colleges Research Universities 1169 1117 1194 1133 1204 1148 1210…

Q: Based on sample data, the 95% confidence interval for the population mean is about $150 to $250. If…

A: The null and alternative hypothesis is, Ho: µ = $260 versus H1: µ ≠ $260 The 95% confidence interval…

Q: A researcher asks 600 people if they received a flu vaccine, and 65% said they did. What is the 95%…

A: From the provided information Sample size (n) = 600 65% said they received a flu vaccine that is…

Q: Everything else being equal, a population with more variability yields a confidence interval that…

A: It is very useful in statistics . It has wide applications in all hypothesis testing problems .

Q: A survey of 800 women shoppers found that 17% of them shop on impulse. What is the 98% confidence…

A:

Q: 1. A study constructed a 95% confidence interval for the proportion of adults in the U.S. that have…

A: Note- Since you have posted multiple questions, as per our guidelines we are supposed to answer only…

Q: Gallup is a company that conducts daily opinion polls on a variety of topics. In a recent daily…

A: Given that, Sample size, n = 1000 38% of the sample said they were committed to their work.

Q: A survey of 800 women shoppers found that 17% of them shop on impulse What is the 98% confidence…

A:

Q: Would you guess that people tend to buy more jeans when the weather is warm or when it is cold? The…

A:

Q: Suppose that 18% of a random sample of 2307 Miami residents said that they will donate blood in…

A: The sample proportion is given as 0.18. The sample size is given as 2307. The two-tailed z-critical…

Q: In an articie in the Journal of Advertising, Weinberger and Spotts compare the use of humor in…

A:

Q: According to a study completed in 2006 by Pew Internet, 42% of all Americans had a broadband…

A: The 95% confidence interval for p is (0.439, 0.457).

Q: In a survey funded by the UW school of medicine, 750 of 1000 adult Seattle residents said they did…

A: Find z-critical value:…

Q: When we regress a variable Y on another variable X, which of the following will NOT lead to a wider…

A: Here use formula of confidence interval of slope coefficient

Q: The t-value (t - score) that would be used to construct a 99% confidence interval given a sample…

A:

Q: A poll of 2500 people shows that 50% approve of a smoking ban in bars and restaurants in Kentucky.…

A: Given, n = 2500 p = 50% = 0.50 At 95% Confidence level, the value of Z is 1.96

Q: 3. In a sample of 300 people, 154 said that they watched news on television. Find the 90% confidence…

A: Given : Sample size of people (n) = 300 Let X : No. of people from sample  who said they watched…

Q: A recent survey of cell phone users indicated that 56 percent of the respondents prefer to use cell…

A: Given that 56% of the respondents prefer to use cell phones for texting rather than for making phone…

Q: he Pew Social Media Update 2014 surveyed 1,597 adult internet users on which social media websites…

A: Given information- We have given that Social Media Update 2014 surveyed 1,597 adult internet users…

Q: 1) In a four-year psychedelic-mushroom experiment, 93 of the 300 subjects reported experiencing…

A: It is given that:

Q: A poll commissioned by the Center on Addiction and Substance Abuse at Columbia University found that…

A: Given that, X = 1340 N = 2000 98% confidence level

Q: The figure to the right shows the results of a survey in which 999 adults from Country A, 1002…

A:

Q: In a study of the use of hypnosis to relieve pain, sensory ratings were measured for 8 subjects and…

A:

Q: (a) An article in a medical journal suggested that approximately 15% of such operations result in…

A: 15% of operations result in complication; p=0.15 Margin of error=0.03 α=0.002

Q: A student was asked to find a 95% confidence interval for the proportion of students who take notes…

A: It is given that a student was asked to find a 95% confidence interval for the proportion of…

Q: For a fixed sample size, what happens to a confidence interval for u when we increase the level of…

A: Here we need to determine whether the width of the confidence interval becomes narrower or wider…

Q: A statistics student wants to conduct a study to determine the proportion of workers in Cititon who…

A:

Q: A group is interested in seeing if the mean battery life from two different brands of batteries are…

A: The pooled variance is, sp2=n1-1s12+n2-1s22n1+n2-2=19-172+17-110219+17-2=248234=73 The pooled…

Q: For what type of variable does it make sense to construct a confidence interval about a population​…

A: Qualitative variable: A variable which cannot be measured in numerically is known as a Qualitative…

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.