A population has a mean of 509 and a standard deviation of 458. Suppose a sample of size 100 is selected and x-bar is used to estimate u. What is the probability that the sample mean will be within +30 of the population mean? Tapez votre réponse.....

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Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A: The sample mean and the standard deviation are μ = 80 and σ = 12 respectively.Let X denotes the…

Q: A random sample of 25 observations yield a mean of 106 and a standard deviation of 12. Find the…

A: From the given information,Sample size 25, mean 106 and standard deviation 12

Q: Assume that body temperatures of healthy adults are normally distributed with a mean of 98.2°F and a…

A: The probability for the sample size for n = 25 is obtained below:From the given information X…

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Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Given that ,                    sample size n=100                    Mean u=80…

Q: The average score of all golfers for a particular course has a mean of 76 and a standard deviation…

A: We have given information with the usual notation, Let X denote the score of golfers for a…

Q: A sample of 169 is drawn from a certain population. This sample has a mean of 80 and a standard…

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Q: A veterinary researcher takes an SRS of 60 horses presenting with colic whose average age is 12…

A: Suppose a random sample of sufficiently large sample size drawn from a population whose mean is µ…

Q: A random sample of 100 male students is drawn from a particular class. The mean and standard…

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Q: A random sample of 18 light bulbs is drawn from a normally distributed population. The population…

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Q: Assume that blood pressure readings are normally distributed with a mean of 123 and a standard…

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Q: A simple random sample of 64 observations was taken from a large population. The sample mean and the…

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Q: ominic would want to estimate the mean of a population which is normally distributed. The standard…

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Q: Suppose a claim is made that the mean age of members of a golf club is 52 years. The population…

A: Given: n = 50 X = 56 years σ = 6 μ = 52 Formula Used: Test-statistic Z = X-μσn

Q: The standard deviation of the lengths of stays on international cruises is 7.3 days. The sampling…

A: The standard deviation of the lengths of stays on international cruises is 7.3 days Total Sample =70…

Q: If the mean I.Q. is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will…

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Q: The standard deviation for length of stay in a hotel is 7.2 days. For the variable “length of…

A: The standard deviation of the lengths of stays on international cruises is 7.2 days Total Sample =67…

Q: Assume that the test scores for a large class are normally distributed with a mean of 64 and a…

A: Solution-: Given: We find P(the class received a higher score than 78)=?

Q: recent study was conducted and it found that IQ's are normally distributed with a mean of a 100 and…

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Q: Scores on the SAT test have a mean of 1518 and a standard deviation of 325. If 100 students are…

A: Scores on the SAT test have a mean of 1518 and a standard deviation of 325.

Q: The average score of all golfers for a particular course has a mean of 71 and a standard deviation…

A: Solution: Let X be the score of golfer for a particular course. From the given information, X has a…

Q: the mean IQ of tweleve year old boys in a school district is 118; the standard deviation is 18. if a…

A: Obtain the probability that the mean of the sample is greater than 120. The probability that the…

Q: Human body temperatures have a mean of 98.20°F and a standard deviation of 0.62°F. Convert 103.00°F…

A: Given,mean(μ)=98.20standard deviation(σ)=0.62

Q: A student obtained the mean and standard deviation of 100 observations as 40 and 5 respectively. It…

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Q: Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard…

A: Introduction: If P4 denotes the 4th percentile, then observations lie below P4 with 4% or 0.04…

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A:

Q: The average score of all golfers for a particular course has a mean of 74 and a standard deviation…

A:

Q: The standard deviation of the lengths of a hospital stay on the intervention ward is 8.7 days. What…

A: Standard deviations=8.7 n=73

Q: The average score of all pro golfers for a particular course has a mean of 70 and a standard…

A: It is given that, The average score of all pro golfers for a particular course has a mean of 70 and…

Q: A random sample of 11 items is drawn from a population whose standard deviation is unknown. The…

A: Given data Random sample 0f 11 items is drawnsample mean is x=920sample standard deviation is s=25

Q: The mean score on a standard exam is 320 with a standard deviation of 40. Suppose 100scores are…

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Q: Fifty students took a Mathematics exam. Assume that their scores formed a normal distribution with a…

A: Solution-: Given: μ=80,σ=4 We find x such that, P[X>x]=0.025

Q: A random variable that is normally distributed where mean = 60, standard deviation = 2 and x=55.…

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Q: The mean age of a random sample 25 people who were playing the slot machines is 48.7 years, and the…

A: That is, there is no evidence to conclude that the mean age of those playing the slot machines is…