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 4 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 24 years. Sample Size:

Q: Find the critical value for the population mean if there are 756 cats in a sample and you want a 91%…

A:

Q: A researcher found a 95% confidence interval for the proportion of college students who believe in…

A:

Q: The mean value of the 130 observation is 17 with standard deviation deviation equal to 0.98. Find…

A:

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

A: From the given, x¯ (mean IQ score from sample)=105n (sample size)=60σ (population SD of IQ…

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: 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: 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: Construct a​ 95% confidence interval about the mean age.

A: Given Data : Sample Size, n = 32 Sample Mean, x̄ = 37.3 sample…

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

A:

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: Find the Confidence interval for the true Population Mean if a sample of 50 has a mean of 26.8 and a…

A:

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…

A:

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

A:

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…

A:

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

A:

Q: Find a 90% confidence interval for the true proportion of people that eat frog legs, if in a sample…

A: Given, n = 732 p = 0.65 1 - α = 0.90α = 0.1α2 = 0.05   To find, 90% confidence interval for the true…

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…