The American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 44 who smoke. Step 2 of 2 :   Suppose a sample of 1421 Americans over 44 is drawn. Of these people, 454 smoke. Using the data, construct the 90% confidence interval for the population proportion of Americans over 44 who smoke. Round your answers to three decimal places.

Q: You wanted to know how long on average a business student at your university studies per night. You…

A: Given data is 2,1,3,2,4,1,0,3,2,4sample size(n)=10

Q: In 2016 the CDC wanted to estimate the proportion of adults who are smokers in the U.S. The…

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Q: f n=450 and X = 360, construct a 99% confidence interval.

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Q: Many high school students take the AP tests in different subject areas. In one year, of the 144,140…

A: given data  n1 = 144140   x1 = 84545p^1 = x1n1 = 84545144140 = 0.5865 n2 = 216298    x2 = 126501p^2…

Q: Over the break, you do some reasearch. In a random sample of 250 U.S. adults, 56% said they ate…

A:

Q: A survey of 1,000 adults showed 58% believed the driving age should be changed from 16 years of age…

A: Provided information: Number of adults in a survey = 1000 58% believed the driving age should be…

Q: A survey of 700 non-fatal accidents showed that 167 involved uninsured drivers. Construct a 99%…

A: Given data,n=700x=167Point estimate isp=xn=167700=0.2386Construct a 99% confidence interval?

Q: There are many reasons adults use credit cards. A recent survey found that 66% of adults used credit…

A: 66% of adults use credit cards for convenience.Confidence level is 99% i.e., 0.99.Margin of error is…

Q: A poll of 1060 adults in a country was conducted by telephone. Of those surveyed, 169 had…

A: The sample size is 1060 and number of success is 169.

Q: The American Heart Association is about to conduct an anti-smoking campaign and wants to know the…

A: Sample size Number of successes i.e., number of people who smoke is The objective is to construct…

Q: Beth wants to determine a 90% confidence interval for the proportion of high school students in a…

A: We have given that,  Population proportion (p) = 0.57, margin of error (E) = 0.04 and confidence…

Q: A health magazine is interested in knowing the population proportion of people who eat fast food…

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Q: A survey of 26 individuals found that they spent an average of $39.21 on exercise attire for the…

A: Confidence interval is an inference process which is used to estimate the population parameter. The…

Q: Emilio wants to estimate the percentage of people who have a financial adviser. He surveys 350…

A: given data  n = 350 x = 76 we have to interprete 99% confidence intervl.

Q: Hearts College found that 50 students out of a sample of 600 students take the subway to school.…

A: Given data is fit for difference of proportions. we need to find the confidence interval for 90%.

Q: In a survey of 323 adults over 50, 60% said they were taking vitamin supplements. Find the margin of…

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Q: A survey of 100 men found that 68% said they find it hard to buy holiday gifts that convey their…

A: Solution

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Given information- Margin of error, E = 6% = 0.06 Confidence level, c = 98% Since nothing is known…

Q: When 290 college students are randomly surveyed, it is found that 120 own a car. Find a 99%…

A: Given that, x=120,n=290 The sample proportion is, Critical values: By using the standard normal…

Q: In a sample of 310 adults, 177 had children. Construct a 87% confidence interval for the true…

A: Find z-critical value:…

Q: You are constructing a 99% confidence interval for the proportion of all caterpillars that…

A: Given information- Sample size, n = 396 We have given that out of 396 randomly selected caterpillars…

Q: A recent study indicated that 24% of women over 55 are widows. A researcher wishes to estimate with…

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Q: Thelma and Louise are each attempting to estimate the proportion of adults who enjoy listening to…

A: Given that.  p=0.29 C.I for Thelma's=(0.242 , 0.338) C.I for Louise's=(0.237 , 0.323)

Q: You want to estimate the percentage of small incorporated businesses that are owned by women. A…

A: The random variable percentage of small incorporated businesses follows binomial distribution. The…

Q: . A survey of folk music fans yields this 95% confidence interval estimate of the proportion of fans…

A: The 95% confidence interval for proportion of fans who love music of David Wilcox is 0.74 to 0.86

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: How many people should be surveyed to construct a 95% confidence interval with error = 3% to…

A: Given that Margin of error, E = 0.03 Population proportion, p = 0.15 Level of confidence = 95%

Q: The national average for the percentage of high school graduates taking the SAT is 49%, but the…

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Q: Suppose you calculate a 95% confidence interval for a proportion to to be: 0.39 to 0.78. Determine…

A: Given,   Lower bound = 0.39​ Upper bound = 0.78   Here, we use to determine the margin of error.

Q: Examining a random sample of records from my past Statistics classes, I found the 47 of the 282…

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Q: 4. A researcher asks 600 people if they received a flu vaccine, and 65% said they did. What is the…

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Q: 24. Job Interviews In a Harris poll of 514 human resource professionals, 90% said that the…

A: From the parts b) and c), the 99% confidence interval is (0.8659 , 0.9341) and the 80% confidence…

Q: Some students think that a 90% confidence interval contains 90% of the data. Use the list of data on…

A: As it is calculated that,  90% confidence interval for mean is,  (295753.6,464478.4)

Q: Describe when you would use a t-score instead of a z-score when finding a confidence interval.

A: Describe in what conditions t-score would be used instead of a z-score when finding a confidence…

Q: Use the sample data and confidence level given below to complete parts (a) through (d). A research…

A: Givensample size(n)=940x=570

Q: A recent survey conducted in a nearby town showed that 791 out of 1,495 people do most their holiday…

A: Here, the sample proportion is =7911495=0.5291 Now, for 90% confidence z=1.645

Q: Out of 500 people sampled, 145 received flu vaccinations this year. Based on this, construct a 90%…

A: We have given that  Sample size n=500 , favorable cases x=145 90% confidence interval  Sample…