A population has a standard deviation of 8. What is the minimum sample size needed to estimate a mean to within 2 units with 66.8% confidence? O A. 13 О В. 15 ОС. 12 O D. 16 O E. 14

Q: The minimum sample size needed to estimate a population mean within 2 units with a 95% confidence…

A: Given Information -  Population Standard deviation (σ) = 8 Margin of error (E) = 2 Confidence level…

Q: 8.40 If a light bulb manufacturing company wants to estimate, with 95% confidence, the mean life of…

A: Given data,σ=1000E=200z-value at 95% confidence is Zc=1.96n=?

Q: Suppose that the standard deviation of the tube life for a particular brand of TV picture tube is…

A:

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A:

Q: A. 76% of sunflower seeds will germinate into a flower, and a sample of 800 such sunflower seeds is…

A: Given  n=800, p=0.76  We want to find the mean and standard deviation.

Q: How large a sample would be necessary to estimate the true population mean in a large population…

A:

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: Given that

Q: What proportion of the population would be expected to have a petal length (a) greater than 4.5 cm?…

A: Let , X→N(μ=3.5 , σ=0.5) Our aim is to find the following :  a) The proportion would be expected to…

Q: 4. Given a distribution with a mean of 60 and standard deviation of 21, find a value with a z-score…

A: Suppose X be the random variable which follows Normal distribution with mean μ=60 and the standard…

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: we have given that  n1=35 ,n2=35 xbar1=44 ,xbar2=46 ,sigma1=4.9, sigma2=4.7  and alpha =0.10 Note :…

Q: whose puilding values per acre are given, are unusual (more than two standard deviations from the…

A: X 1493 2089 1232 801 1590 1545 The data value that is less than $1200 is $801 and greater…

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: GivenMake Ax1^=42s1=4.9n1=35Make Bx2^=43s2=4.6n2=35α=0.10

Q: For a population with a mean of 72 and a standard deviation of 10 what is the standard error of the…

A: From the provided information, Mean (µ) = 72 Standard deviation (σ) = 10

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of​ automobiles, a…

A: we have given that  n1=35 ,n2=35 ,xbar =43,  xbar =44 ,sigma1=4.7 and sigma2=4.5   Note : according…

Q: 2. Given a standard deviation of 3.7, what is the mean if1 0% of the population has a distribution…

A: We have given that,  Let x be the random variable from normal distribution with standard deviation…

Q: a chemist analysis an iron ore for FeO.and obtained value of 12.35% with a standard deviation of…

A: Given:Sample size, n=4Confidence level=95%

Q: For a population mean of 50, a sample mean of 52, an estimated standard deviation of 3, and a sample…

A: Given information Population mean µ = 50 Sample size (n) = 20 Mean x̅ = 52 Standard deviation (s) =…

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean…

A:

Q: A sample of 100 tyres is taken from a lot. The mean life of tyres is found to be 39, 350 kilo meters…

A: Solution-: By using R-Software: #Given :xb=39350,mu0=40000,n=100,sdx=3260#To test the hypothesis as…

Q: Given a sample mean of 94.3, a sample standard deviation of 8.4 and a sample size of 6, test the…

A:

Q: Suppose that the standard deviation of the tube life for a particular brand of TV picture tube is…

A: It is given that , the standard deviation of the tube life for a particular brand of TV picture tube…

Q: For a sample of 40 items from a population for which the standard deviation is σ = 7.4, the sample…

A:

Q: A given distribution has a population mean, μ, of 139 and a population standard deviation, σ, of 9.…

A:

Q: A researcher is interested in the decrease in adolescent BMI after a new after school program is…

A:

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: Other parts are not provided by you. Still I have tried to provide you detailed solution

Q: 1. The average height of the students in a famous college in the city is unknown but the standard…

A: 1. The population standard deviation is 0.8, sample size is 49, and sample mean is 6.1. Computation…

Q: A consumer group claims that the mean annual consumption of banana by a person in the Philippines is…

A:

Q: How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters…

A: Given Information: Confidence level = 90%  Error (e) = 4 minutes Standard Deviation (s) = 12 minutes…

Q: 7. For a population with a standard deviation of σ = 20, how large a sample is necessary to have a…

A: Standard deviation: Standard deviation is defined as the positive square root of Variance. It is…

Q: 1. Assume that the average yearly pay of all teachers in the Philippines follows a normal…

A: Here all are normally distributed

Q: To find the standard deviation of the diameter of wooden dowels, the manufacturer measures 19…

A:

Q: 5. It is known that the mean systolic blood pressure for Canadian males aged 35 to 44 years is 128,…

A: Solution: Given information: n= 72 Sample size x=126.07  Sample mean μ= 128 Population mean σ= 15…

Q: A random sample of size 25 from a popúlation gives the sample standard deviation to be 8.5. Test the…

A:

Q: From a normally distributed population, we took a simple random sample of 700 students with a mean…

A: Given: n=700, x=640, σ=300 and 1-α=90%. Then,1-α=0.9⇒α=0.1   The value of z at α=0.1 is 1.645.

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A:

Q: For a population with a mean of μ = 75 and a standard deviation of σ = 7, find the z-score…

A: Population mean μ=75, standard deviations σ=7, M=84, n=6

Q: For a population with a means of 72 and a standard deviation of 10 what is the standard error of the…

A: We have given that  Mean=72 Standard deviation=10 Sample size=25 Find the standard error

Q: The daily demand for six-packs of Coke at Mr. D’sfollows a normal distribution, with a mean of 120…

A: Given: Let X be the number of six packs ordered daily. Given: X is normally distributed. Mean of X =…

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean…

A: From the provided information, Standard deviation (σ) = 0.04 Confidence level = 95%

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: There are two independent samples which are make A and make B. We have to test whether the mean…

Q: To compare the dry braking distances from 30 to 0 miles per hour for two makes of automobiles, a…

A: Given,X1=42, σ1=4.7, n1=35X2=45, σ2=4.4 , n2=35and level of significance α=0.10

Q: 2. The owner of a factory that sells a particular bottled fruit juice claims that the average…

A: Given: population mean(μ)=250sample size(n)=100sample mean (x¯)=248standard deviation(σ)=5

Q: Suppose that water usages in American showers are normally distributed, with an average shower using…

A: Given: mean = 17.1, SD = 3.5

Q: A given distribution has a population mean, μ, of 148 and a population standard deviation, σ, of 6.…

A: From the provided information, Mean (µ) = 148 Standard deviation (σ) = 6 X ~N (148, 6)

Q: ey found that the average hotel room rate in State I is RM88.22 and the average room in State II is…

A: Following hypothesis can be created as:   The critical value from standard normal distribution at…

Q: 41. A sample of 35 values has mean 80 and standard deviation 4. A second cample of 65 values has…

A: It is a single value within the range of data which represents a group of individuals values in a…

Q: A researcher wishes to see if the average number of sick days a worker takes per year is greater…

A: Hypotheses:Let µ be the true average number of sick days a worker takes per year. The aim of the…

Q: Consider population data with 5 being the standard deviation, 5 being the mean. Compute an 88.9%…

A: It is given that the mean is 5 and the standard deviation is 5.

Q: 1.) It is claimed that the average performance of newly graduated nurses from the recent board exam…

A: Since you have asked multiple question, we will solve the first question for you. If youwant any…