Scores on a standardized exam are known to follow a normal distribution with standard deviation o = 14. A researcher randomly selects 85 students and computes their average score. He reports that the mean score is 74.1, with a margin of error of 2.802. How confident are you that the mean score for all students taking the exam is in the interval (71.298, 76.902)? Confidence = %

Q: n this scenario, what is the test statistic? A linguist believes the average age children learn a…

A: Given: n= 21.0 ,x̄= 9.2 ,s= 2.5 µ= 10.0 ,degree of freedom= 20.0

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A: μ  = 506 , σ = 100  Z~ N(0,1)

Q: A distribution of values is normal with a mean of 123.2 and a standard deviation of 62 Find P35,…

A: Given: A distribution of values is normal with  μ=123.2 , σ=62

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A: Given that: Population mean, μ=174.45 Population standard deviation, σ=6.75 Height of tallest man,…

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A:

Q: Scores for a standardized test are normally distributed with a mean of 1200 and a standard…

A: given data μ = 1200σ = 60 normal distributionn = 64P(1200<x¯<1214) = ?

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A:

Q: You invented an iPhone app. The mean time that users engage with this app is 8.2 minutes and the…

A: The mean is 8.2 minutes and the standard deviation is 1 minute.

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A: Let us assume X=score Given that X follows a normal distribution with mean= 100 and standard…

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the IQ…

A: Excel formula: =NORMINV(0.305,0,1)=-0.5100

Q: Scores on a standardized exam are known to follow a normal distribution with standard deviation o =…

A: From the provided information, Sample size (n) = 75 Sample mean (x̅) = 73.4 Population standard…

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A:

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A: The Chebyshev's theorem and Empirical rule is use to calculate the proportion or percentages of…

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A:

Q: Scores on a standardized exam are known to follow a normal distribution with a standard deviation…

A:

Q: When Rajani goes bowling, her scores are normally distributed with a mean of 125 and a standard…

A:

Q: 2000 freshmen at state university took a biology test. the scores were normally distributed with a…

A: Solution: Let X be the scores. From the given information, X follows normal distribution with mean…

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A: We have given that  Mean of 96 and a standard deviation 20.9. X~Normal(μ=96,σ=20.9)

Q: ly normal and has a standard deviation of 88% of students scored above a 800. What is the mean of

A: The mean of the binomial random variable obtained by the formula μ=np, where (n) is the number of…

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A: A) The population standard deviation is 1.3 hours.

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A: Let "X" be the IQ score of adults. Draw the normal curve and shade the area of 0.25 to the left…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 95.6 and a standard…

A: Given: x~N(μ,σ)μ=95.6σ=24.3

Q: The Psych 230 students finished the course with a total population mean of 130 points and the…

A:

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

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Q: Score for the California Peace Officer Standards and Training test are normally distributed, with a…

A: Given X is normal Distributed with mean µ = 69.6 and standard deviation σ = 11.3 now will use…

Q: the mean is 146, and standard deviation is 35. A score of 181 is how many z-scores above the mean?

A:

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A: X follows a Normal distribution with mean = 31.5 and S.D = 6.9 Then z=(x-mean)/SD = (x-31.5)/6.9…

Q: Test scores for the SAT are close to normal with an average of 850 and a standard deviation of 100.…

A: Given information: Mean SAT test scores μ=850 Standard deviation of SAT test scores σ=100 The SAT…

Q: Assume that adults have iq scores that are normally distributed with a mean of 98.2 and a standard…

A: