You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 5 years of the actual mean with a confidence level of 98%, how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 19 years.

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Q: Your statistics instructor wants you to determine a confidence interval estimate for the mean test…

A: Given that x¯ =160,σ = 45 ,α=0.05

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Q: A sample of 60 people who were chosen for a sample had an average IQ score of 105. If the population…

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Q: You measure 41 watermelons' weights, and find they have a mean weight of 47 ounces. Assume the…

A: Given that: n= 41.0 , x̄= 47.0 s= 2.5 At 90.0 % confidence level , z score= 1.645 So, 90.0 %…

Q: Find a 90% confidence interval for the population standard deviation if you are given a sample of 10…

A: Given data : sample size,n = 10 df=n-1= 9 sample standard deviation,s= 3.0…

Q: A certain counselor wants to compare mean IQ scores for two different social groups. A random sample…

A: Given that    Sample sizes n1=13    , n2=11      Sample means X̄1=103      , X̄2=116      s1 =15…

Q: Find a 90% confidence interval for the population mean, if the sample size is 58, the sample mean is…

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Q: The standard deviation of the weights of elephants is known to be approximately 15 pounds.  We wish…

A: Sample mean = x̅ = 244 Sample size = n = 50 Population S.D = σ = 15 Standard Error = σ/√n  =…

Q: An Army official wants to estimate the mean weight of a particular type of weapon.  He takes a…

A: Given that, Mean = 48.1 Standard deviation = 0.12 Sample size = 100 98% confidence level

Q: Valid Missing Total 59.9% Freshman Sophomore Junior Senior Total System 96.1% 243 55.9% Class rank…

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Q: A poll reported that only 507 out of a total of 1809 adults in a particular region said they had a​…

A: The sampled no. of adults, i.e., the sample size, n=1809. The no. of sampled adults who expressed a…

Q: You are a researcher for the National Highway Traffic Safety Administ estimate the average blood…

A: Given that,The sample size is The sample mean BAC (Blood Alcohol Concentration) is The known…

Q: When solving a problem related to one sample and the confidence interval of variance. Which table…

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Q: The number of television sets coming off a production line each day is known to have a standard…

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Q: Social scientists have designed a “happiness survey” that attempts to measures how happy people feel…

A: As per guidelines we will solve first question only, please repost other questions for more answers.…

Q: A research scholar wants to know how many times per hour a certain strand of virus reproduces. The…

A: It is given that,Sample mean = 11.3.Population standard deviation, sigma is 2.3.The sample size, n…

Q: You collect a sample of 69 observations of animal heights, in mm. The sample mean is 41.89 and the…

A: Given: x¯=41.89s=4.33n=69 The degrees of freedom is obtained as below: df=n-1=69-1=68 The critical…

Q: A group of 65 randomly selected students have a mean score of 30.6 with a standard deviation of 5.4…

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Q: Determine the 99.5 percent confidence interval that contains the population variance if the sample…

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Q: A random sample of 110 Americans was asked how many hot dogs they eat each year.  The sample mean…

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Q: 2. The physician of OSFI would like to know the average weight of grade 3 students. 18 UU this, she…

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Q: If you have a population standard deviation of 10 and a sample size of 4, what is your standard…

A: Given,population standard deviation(σ)=10sample size(n)=4

Q: You are interested in estimating the the mean weight of the local adult population of female…

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Q: The average score for 100 teenagers playing a certain computer game was 80,000 points per player. If…

A: Here we need to construct a 68% confidence interval for the mean score of all teenagers. Given…

Q: A recent study of 28 city residents showed that the mean of the number of years they lived at their…

A: The formula of confidence interval for the population mean is given by                  confidence…

Q: The 95​% confidence interval for the proportion that express a great deal of confidence or quite a…

A: A poll reported that only 645 out of a total of 2029 adults in a particular region said they had a​…

Q: You measure 41 watermelons' weights, and find they have a mean weight of 79 ounces. Assume the…

A: Mean = 79Standard deviation = 2.4Sample size = 41

Q: please give me answer step by step

A: Step 1: Suppose µ is the population mean commute time of all TCC students. The sample size, sample…

Q: Americans (on average) individually eat 16 pounds of seafood each year with a standard deviation of…

A: Given that   x̄ = 14 , μ = 16 , ? = 7 , n = 4

Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: confidence interval for a population mean is (56,78), with a margin of error of 11. What is the…

A: From provided information, Confidence interval for population mean is (56, 78), with margin of error…

Q: Data of the weights of 81 pet dogs was collected. The sample mean was 30. The standard deviation is…

A: Here, T - interval is applicable ================= df = n-1

Q: Find 95% confidence interval for the population mean, if the sample size is 40, the sample mean is…

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Q: Find the critical t value to use in making an 80% confidence interval for a mean if the sample size…

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Q: stimating the the mean weight of the local adult population of female white-tailed deer (doe). From…

A: The sample size can be calculated as: n=z×σE2Here, z = desired confidence level E = The allowable…

Q: From a random sample of 64 high school seniors, the sample mean and standard deviation of the math…

A: Given,mean(x)=90standard deviation(s)=7sample size(n)=64α=1-0.92=0.08α2 =0.04degrees of freedom…

Q: Find the Margin of Error, if we are asked for 90% confidence interval where the mean is 52.3, the…

A: The provided information are: Confidence level = 90% Population standard deviation (σ)=2.15 Sample…

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.