You are a researcher studying the lifespan of a certain species of bacteria.  A preliminary sample of 35 bacteria reveals a sample mean of ¯x=72x¯=72 hours with a standard deviation of s=6s=6  hours.  You would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.4 hours at a 98% level of confidence. What sample size should you gather to achieve a 0.4 hour margin of error? Round your answer up to the nearest whole number. n =   bacteria

Q: A population was found to have a mean of µ =75 and standard deviation of σ =2.3. If you took every…

A: Given information- Population mean µ = 75 Population standard deviation, σ = 2.3 Sample size, n = 10

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

A: The provided information are: Population standard deviation σ=4 Margin of error (E) = 0.5 Confidence…

Q: Choose a quantitative variable.  Measure it on two different samples of 10, drawn from two different…

A:

Q: A sample has a mean of 5.3, a median of 5.1, a sample standard deviation of 1.2, and a sample…

A:

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 %,…

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

A: It is given that the confidence level is 0.95, the standard deviation is 5.6, and the margin of…

Q: You are a correctional officer interested in whether the 45 children in your juvenile facility have…

A: Given information- Population mean, μ = 10 per year Sample size, n = 45 Sample mean, x-bar = 14 per…

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

A:

Q: You are conducting an experiment to examine the anxiety levels of a group of Engineering studer The…

A:

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

A:

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

A:

Q: How many retired people should be sampled if we want to calculate with 92% confidence the true mean…

A: The provided information are: Confidence level = 92% Margin of error (E) = 0.8 Population standard…

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

Q: A population with µ = 46 and s = 9 is transformed into z-scores. After the transformation, what is…

A: Answer: For the given data,

Q: A random sample of 46 adult coyotes in a region of northern Minnesota showed the average age to be x…

A:

Q: Question 6 > You are interested in estimating the the mean lifespan of a cell phone. From past data,…

A: Method are defined in the solution

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

A:

Q: e life spa

A: Given that n1=109x1=45.5S1=18.2n2=105x2=44.9S2=11.4 1) We want to test the hypothesis that there is…

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

A: Given data  n = 30 x¯ =76  S = 6.4 99% ci  E = 0.55 n = ?

Q: How large of a sample is required if we want to estimate the mean price of a five year old Corvette…

A: Obtain the critical value at 90% confidence level:It is given that the standard deviation value is…

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

A:

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…

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5, what value…

A: X follows a Normal distribution with mean = 35 and S.D = 7.5 Then z=(x-mean)/SD = (x-35)/7.5…

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5, what value…

A: From the given information, normal distribution with population mean as 35 and standard deviation as…

Q: Question 4 a) A medical researcher wants to investigate the amount of time it takes for patients'…

A: Given data: a). Population standard deviation = 25 Margin of error = 5 minutes Confidence level =…

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

A:

Q: You may need to use the appropriate appendix table or technology to answer this question. Money…

A: (a) Obtain the margin of error for the 95% confidence interval of the mean cost in dollars of the…

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.