A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 35 bacteria reveals a sample mean of ¯x=68x¯=68 hours with a standard deviation of s=7s=7 hours. He would like to estimate the mean lifespan for this species of bacteria to within a margin of error of 0.5 hours at a 95% level of confidence. What sample size should you gather to achieve a 0.5 hour margin of error? He would need to sample  bacteria.

Q: Suppose that you are interested in determining the average height of a person in a large city. You…

A: Solution: Given information: n= 400 Sample size  x=63 inches Sample mean s= 6 inches Sample standard…

Q: The average U.S. adult weight is 180 lbs. with a standard deviation of 15 lbs. A nutritional…

A: Given: X=Weight of US adult. Sample mean, x=165 Sample size, n=100 Population mean, μ=180 Standard…

Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample. If it was obtained from…

A:

Q: Suppose a small paint manufacturing company has a daily production that is normally distributed with…

A: Solution: It is given that a small paint manufacturing company has a daily production that is…

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: a) What is the setup for your null and alternative hypothesis? b) What is the value of the test…

A: Here AS PER POLICY I HAVE CALCULATED 3 SUBPARTS PLZ REPOST FOR REMAINING PARTS WITH NOTE I NEED…

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: In a recent year, Washington State public school students taking a mathematics assessment test had a…

A: Given Information:

Q: To estimate the mean height μ of male students on your campus, you will measure an SRS of students.…

A: From the provided information, The height of young men are approximately normal with standard…

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A: Let,  μ1 :  the population mean benzene concentration for untreated water and  μ2: the population…

Q: A researcher wishes to see if there is a difference in the manual dexterity of athletes and that of…

A: Sample mean for athletes x¯1=89 Sample mean for band members x¯2=95 Standard deviation σ=7.4 .…

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

A: Let. X: The lifespan of a certain species of bacteria in hours.  Given: Sample size = n =25 Sample…

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A: The confidence level is 0.98 The margin of error  ME=2 The population standard deviation σ=8 The…

Q: Two chemical companies can supply a raw material. The concentration of a particular element in this…

A:

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

A: Given,margin of error(E)=0.45standard deviation(S)=5.4α=1-0.95=0.05α2=0.025Z0.025=1.96         (from…

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

A: Here, n=40, x-bar=74, s=4.4, E=0.6.

Q: You are interested in learning about the average online hours per day for ABC College students. Data…

A: 1.

Q: 2. The ages of the 189 people were recorded in a clinical study. The data have been partially…

A: The given data is as follows,…

Q: duction of 12 male red-winged blackbirds before and after receiving testosterone implants was…

A: given:  d = 0.056  sd = 0.175  probability of 0.8, mean change of 0.01

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

A:

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 researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 25…

A: It is given that the confidence level is 0.99, the standard deviation is 4.4, and the margin of…

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A:

Q: A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 35…

A:

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

A:

Q: The difference in the Organic Chemistry final exam scores between last semester and three years ago…

A: Given that

Q: A sample of n=25 scores has a mean of 68. Find the z-score for this sample. If it was obtained from…

A:

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

A:

Q: A cohort of patients have lost on average 23 pounds and the standard deviation of the sample is 1.2…

A: We have been given that a cohort of patients have lost on average 23 pounds and the standard…

Q: A researcher wants to know the lifetime of a "BL" brand lamp. For necessity research, it takes 9…

A: Given : Population Mean life , μ = 1500 hrs Population standard deviation , σ = 111 hrs

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: Given,Sample standard deviation, s = 5.4 hours Margin of error, E = 0.5 hourConfidence level, C =…

Q: A population has a mean of 250 and a standard deviation of 24. What value from the population has a…

A: Solution

Q: In the year 2033, katy perry is a leading traveling nurse. Katy is interested in reducing the mean…

A: Population mean, μ=8.6 Sample size, n=46 Sample mean, x¯=8.1  Sample sd, s=1.2 α=0.05

Q: From generation to generation, the mean age when smokers first start to smoke varies. A survey of 20…

A: Given Information :  From generation to generation, the mean age when smokers first start to smoke…

Q: Ann thinks that there is a difference in quality of life between rural and urban living. She…

A: Rural town:Sample size Sample mean Sample standard deviation Urban town:Sample size Sample mean…

Q: g) What are your conclusions in the context of the problem? Relate your conclusions to the test…

A:

Q: A researcher studying the lifespan of a certain species of bacteria. A preliminary sample of 30…

A: From the provided information, Standard deviation (s) = 7 hours Margin of error (E) = 0.75…