You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 30 bacteria reveals a sample mean of ¯x=76 hours, with a standard deviation of s=6.4hours.You would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.55 hours at a 99% level of confidence. What sample size should you gather to achieve a 0.55 hour margin of error? Round your answer up to the nearest whole number. n = ______bacteria

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A: Given data,μ=270.6σ=16.9P(-z<Z<z)=0.50

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A: Given,standard deviation (σ)=4.7margin of error (E)=1α=1-0.99=0.01α2=0.005Zα2 =Z0.005=2.58

Q: You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of…

A: Given:Desired margin of error E=0.75 hours.The sample standard deviation Confidence level is 90 %,…

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A: We have to find sample size required.

Q: You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of…

A: margin of error : E = 0.4590% confidence interval for μ.n = ?σ = 5.6

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: Determine the sample size n needed. Use EXCEL Procedure for finding the critical value of z.…

Q: You are a researcher studying the lifespan of a certain species of bacteria. From a previous study,…

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Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

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Q: You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of…

A: Solution: From the given information, confidence level is 0.90, s=5 hours and E=0.4 hours.

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Q: help please answer in text form with proper workings and explanation for each and every part and…

A: Part 2: ConclusionAnalyzing the effects of an increase in licensing costs for ride-share services…

Q: want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the…

A: The sample size can be calculated as: n=z×σE2 Here, z = desired confidence level E = The…

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A: Given data,σ=2.2E=0.75z-value at 95% confidence is Zc=1.96n=?

Q: You are a researcher studying the lifespan of a certain species of bacteria.  A preliminary sample…

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Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

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Q: How large of a sample size is required?

A: Based on previous evidence, you believe the population standard deviation is approximately σ=30.7.…

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: σ =   27.990% confidence interval for μ.E = 1n = ?

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

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Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: Since population standard deviation is known, use z-distribution to find the critical value.

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A: Solution: From the given information, confidence level is 0.95, σ=61.7 and E=1.

Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: Population Standard deviation = 58.5Confidence interval = 99%Significance level(α) = 1- 0.99 =…

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Q: ou want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: Given that, Critical value: Using the z-table, the critical value at 95% confidence level for two…

Q: You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of…

A: The sample size for the preliminary study  = 30The sample mean, x¯=70 hoursThe sample standard…

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Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

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Q: u want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the…

A: GIVEN DATA  99%  ci for μ. σ = 23.2 E = 4  n = ?

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Q: ou want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

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Q: You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe…

A: given data  95% ci for μ. σ = 58.3 E = 2 n = ?

Q: You are a researcher studying the lifespan of a certain species of bacteria. A preliminary sample of…

A: Given: Earlier sample size = 35 Population standard deviation σ=5.8 Margin of error (E) = 0.5…