How large a sample is necessary to estimate the true proportion of unmarried Canadians aged 25-29 within 5% error with 90% confidence?

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll,…

A:

Q: What sample size is needed if a researcher needed to calculate the true proportion of individuals…

A: HERE , MOE  = 0.01 confidence level = 95% here z-critical for 95% confidence level = 1.96 here use…

Q: What sample size should be obtained if he wants to be within 4 percentage points with 95​%…

A: Given that the margin of error is 4 percentage points. That is, ME=4%=0.04 Confidence level =95% The…

Q: What is the role of the sample size in the determination of confidence interval? Explain.

A: Let us first define sample size and confidence interval. Sample size: It is determination of the…

Q: How large of a sample is required for a poll to have an error of less than 1.2% at a 90% confidence…

A: Given that  Margin of error =E =1.2%=0.012 90% confidence level.

Q: What is the formula for the 95% confidence interval for a population mean, given a sample mean and…

A: Given that 95% confidence interval for populations mean.

Q: What is the purpose of finding a confidence interval for a proportion?

A: A true (or population) proportion (denoted as p), by definition, is essentially determined as the…

Q: Use the confidence interval to find the margin area (.596,.740)   margin of error?  samplemean?

A: Given confidence interval is (.596,.740) margin of error=? sample mean=?

Q: What is the procedure for determining the sample size necessary to estimate a population mean given…

A: The population mean CI for known population standard deviation is X¯± ( Zα2σn)where X¯=sample mean…

Q: How large of a sample is required for a poll to have an error of less than 1.5% at a 95% confidence…

A: Given:

Q: How do I calculate a 95% confidence level for a sample proportion in excel? Meaning, what formula…

A: Given : Confidence level = CL = 95% = 0.95

Q: Suppose that a 92% Confidence Interval for estimating the average heights, in inches, of all college…

A: confidence interval = x ± margin of errorlower limit = x - margin of errorupper limit = x + margin…

Q: How large must the sample size be in order to estimate a true proportion to within one precentsge…

A: Solution: From the given information, confidence level is 0.90 and E=0.01.

Q: What size sample should be used to estimate a population proportion within 0.02 with 80% confidence…

A: population proportion = P = 0.02 Level of significance = α = 0.02 population proportion is between…

Q: How large must the sample size be in order to to estimate a true proportion to within one percentage…

A: Given that, Critical value: Using the z-table, the critical value at 90% confidence level…

Q: What is the likelihood that a 90% confidence interval will not cover the true population value?…

A:

Q: What is the t-value for a 95% confidence interval given that the sample size is 16? Write the exact…

A: Given: confidence level =95%  Sample size n=16  Then degree of freedom for t-test is =n-1  To find…

Q: How does the sample size and percentage of confidence influence the width of a confidence interval?

A: We have to define effect on width of C.I.

Q: A researcher wishes speeders who exceed the posted speed limit on a particular stretch of road in…

A: Given that the confidence level is 98% Therefore, the significance level is 1-confidence…

Q: A report statesb that 33% of home owners had a vegetable garden. how large a sample is needed to…

A: p=33%=0.33, E=5%=0.05

Q: A report statesb that 44% of home owners had a vegetable garden. how large a sample is needed to…

A: Answer: Using the given data, A report stated that 44% of home owners had a vegetable garden, P =…

Q: 5. Nancy surveyed 35 randomly selected students in her school about the number of hours they spend…

A: Here out of all students in the school Nancy selected 35 students and obtained a measure 1.2, we…

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: Find a 95% confidence interval for the difference between full attendance students' Exam 5 score and…

A: We have given data,  Less attendance Full attendance 90 96 90 96 60 100 50 99 69   88…

Q: Find the margin of error that corresponds to a sample of size 210 with 70% successes at a confidence…

A: Sample size is 210. Percentage of successes is 70%. Percentage of confidence level is 90%.

Q: What is the margin of error for a sample of 34 students whose average height, with 90% confidence,…

A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…

Q: You want to estimate the mean number of friends for all Facebook users. How many users must be in…

A: Given that, Population standard deviation σ=53 Margin of error E=7 Confidence level is 95%

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: a random sample of 25 children is selected and each is given several pieces of yummy gummy candy.…

A:

Q: How tp use a sample mean to calculate a confidence interval?

A: The equation for confidence interval can be stated as:

Q: If a 90% , a 95% and a 99 % confidence interval are found for a population ean, describe how the 3…

A: Solution :  A 90%, a 95% and a 99 % confidence interval are found for a population mean.

Q: Determine the margin of error in estimating the population mean, μ. Based on a sample of size 45, a…

A:

Q: estimated that 80% of people with type 2 diabetes are overweight. You want to do a study on type 2…

A: Given Data : Margin of error: ME = 0.0463 sample proportion: p̂ = 0.8…

Q: In a clinical test with 500 subjects, 2500 showed improvement from the treatment. find the margin of…

A: we have given that  sample size=N=2500 . , favorable cases =X=500 sample proportion…

Q: A psychologist asked a random sample to complete a depression questionnaire. On average, children…

A: We assume the population is normally distributed.

Q: What sample size is needed to give a margin of error within + 13 in estimating a population mean…

A: Given: c = confidence level = 99%E = Margin of Error = 13s = Standard deviation= 133 Find sample…

Q: Nearly one-half of Americans ages 25 to 29 are unmarried. How large a sample is necessary to…

A: The provided information is The margin of error is E=0.02 α=0.05 The critical value is zc=1.96…

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.