Sample 100 electronic components produced by a certain method. The mean lifetime is 125 hours and standard deviation 20  find the sample size needed so that 99.8% confidence interval will have a margin of error of 4 .  a sample size of what is needed so that 99.8% confidence interval will have a margin of error of 4

Q: A sample of 30 adults attending a country fair determined that the mean age was 39, given that the…

A: sample size(n)=30 Mean(x)=39 standard deviation(σ)=10 confidence level=99%

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: We are interested in estimating the average amount spent per customer for lunch in a restaurant in…

A: Confidence interval: It is defined as the range which contains the value of a true population…

Q: c= 0.95 sample size = 55 sample mean = 65.36 sample standard deviation =2.3658 find out the…

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Q: When 33 campers are randomly selected and surveyed, it was found that the average number that prefer…

A: Given Information: Number of campers randomly selected, n =33 Avarege numple of peope prefer to camp…

Q: Find the sample size necessary for a 99% confidence level with maximal margin of error E = 2.00 for…

A: Solution

Q: A sample of 26 observations is taken from a normal distribution with unknown mean, the sample mean…

A: Answer: From the given data, Sample size(n) = 26 mean (x¯) = 12.6 Standard deviation(σ) = 2.5 95%…

Q: A sample of 42 observations is taken from a normal population with a standard deviation of 8. The…

A: Answer: From the given data, Sample size(n) = 42 Mean (X¯) = 45 Standard deviation(σ) = 8 99%…

Q: 49 items are randomly selected from a population of 500 items. The sample mean is 40 and the sample…

A: Confidence interval can be calculated using this formula:CI = x̄ + t n​s​where:x̄ = sample mean =…

Q: A random sample of 64 completion times for a task gave a sample mean of 35 secs and a sample…

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Q: To determine the average number of minutes it takes to manufacture one unit of a new product, an…

A: Given information Sample size (n) = 15 Sample mean x̅ = 3.92 Standard deviation (s) = 0.45 Taking…

Q: When 38 campers are randomly selected and surveyed, it was found that the average number that prefer…

A: The summary of statistics is, x¯=24,σ=10.7,n=38 Critical values: By using the z-tables, the critical…

Q: If the mean= 85 and standard deviation =8 and n=64(sample size) construct a 95% confidence interval…

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Q: A random sample of 16 movies has been selected from a normally distributed population. If the mean…

A: Given that, a random sample of 16 movies has been selected from a normally distributed population.…

Q: Working Breath Rate Two random samples of 32 individuals were selected. One sample participated in…

A: Given that : xˉ=14,σ=4.2,n=32α=1−C=1−0.9=0.10zc​=z2a​​=z20.10​​=1.645(critical value is obtain from…

Q: The average measured verbal IQ (IQV) scores of children is 100.  In a sample of 20 children, the…

A: Population mean (µ) = 100Standard deviations (σ) = 18.5Sample size (n) = 20Sample mean (x̅) =…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: The following information has been provided: The confidence level is 95%. The margin of Error is…

Q: What is the sample size required to construct a 90% confidence interval for the population mean with…

A: Given,E=0.2z-value at 90% confidence is Zc=1.645Let the last two digits of your student ID is…

Q: You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters has a mean…

A: From the provided information, Sample size (n) = 50 Sample mean (x̄) = 5.625 grams Standard…

Q: Determine the sample size required to estimate a population mean to within 8 units given that the…

A: Margin of error(E)=8standard deviation()=55confidence level=95%

Q: A cellular phone company is interested in estimating the difference between the mean ages of females…

A:

Q: A sample of 22 adults attending a country fair determined that the mean age was 35 given that the…

A: Answer: From the given data, Sample size(n) = 22 mean (x¯) = 35 Standard deviation(σ) = 10 95%…

Q: construct a 95% confidence interval for the mean number of years of secondary education for employed…

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Q: Suppose we need to construct a 95% confidence interval for the mean of a normal population with…

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

A:

Q: Forty-two items are randomly selected from a population of 500 items. The sample mean is 40 and the…

A: Given : Population size (N) = 500 Sample size (n) = 42 Sample Mean (μ) = 40 Sample standard…

Q: A random sample of 17 snowmobiles was selected, and the lifetime of the battery was measured. The…

A:

Q: The total of individual weights of garbage discarded by 17 households in one week is normally…

A: The objective of this question is to find the 99% confidence interval for the mean weight of garbage…

Q: A sample of 20 body temperatures resulted in a mean of 98.3° and a standard deviation of .24°. Use…

A: From the provided information, Sample size (n) = 20 Mean (x̄) = 98.3 Standard deviation (s) = 0.24…

Q: Find a 98% confidence interval for the true mean length of eyelashes, if a sample 33 eyelashes has a…

A: Let we define µ be the true mean length of eyelashes. A sample 33 eyelashes has a mean length of…

Q: Suppose that a garage samples 20 customers. They find the average time for there oil change is 4,227…

A: The objective of this question is to find the lower bound of the 90% confidence interval for the…

Q: A teacher gives a test to his class of 25 students. Since he wants to quickly obtain an estimate of…

A: The class of 25 students is considered as the population. Sample size n =12 Sample mean x¯=82 Sample…

Q: Find the critical value for a 94% confidence interval when the sample size is 51 and the population…

A: Given Level of significance ɑ=0.06 , n=51  Population standard deviations σ known

Q: Find the sample size required to estimate the mean IQ of all college students. Assume w want a 90…

A: Given : Margin of error, ME = 2.0 population standard deviation, σ = 15.0…

Q: You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters has a mean…

A: According to the given information in this question We need to construct 95% confidence interval

Q: A sample of 28 adults attending a country fair determined that the mean age was 33,given that the…

A:

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.