A population has a mean of 80 and a standard deviation of 8. A random sample of size 75 is selected. The expected value is O A. 80 O B. 75 O C. None of the alternatives is correct. O D. 8

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A: Given that there are 51% are male and 49% are female & if 100 people selected randomly we have…

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Q: A sample of n- 15 scores has M= 20 and s =9. What is the sample standard deviation? 03 O45 69 O81

A: In this case, the sample size is n = 15, the sample mean is M = 20 and the sample variance is s2 =…

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A: As per guideline expert have to answer first three subpart only.

Q: A sampie of size n=90 is drawn from a population whose standard deviation is o = 12.

A: Given,standard deviation(σ)=12sample size(n)=90α=1-0.99=0.01α2 =0.005z0.005 =2.58

Q: 3 4 Percentage 44% 36% 15% 4% 1% a. Find the probability that a fisherman selected at random catches…

A: Given Information: x 0 1 2 3 4 Percentage 44% = 0.44 36% = 0.36 15% = 0.15 4% = 0.04 1% = 0.01…

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Q: Suppose ? has a distribution with a mean of 20 and a standard deviation of 3. Random samples of size…

A: Mean = 20 standard deviation = 3 n = 49

Q: A census of the labor force in a large metropolitan area found that the time it takes for people to…

A: Given: μ = 20.5 minutes σ = 15.4 minutes  n = 40

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Q: A sample is obtained from a population whose mean = 100 and standard deviation = 10. Which of the…

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A: Solution: Let X be the random variable. From the given information, X follows normal distribution…

Q: 6. For a population with a mean of u = 45 and a standard deviation of o = 10, what is the standard…

A: Given that, Mean = 45 Standard deviation = 10

Q: Given that x is a normal variable with mean μ = 111 and standard deviation σ = 13, find the…

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Q: A population has a mean of 80 and a standard deviation of 8. A random sample of size 75 is selected.…

A: Sampling Distribution of a Normal Variable : Given a random variable X. Suppose that the population…

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Q: If X is a normally cistributed random variable with a mean of 45 and a standard deviation of 8, find…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Given that x is a normal variable with mean μ = 43 and standard deviation σ = 6.3, find the…

A: It is given that the mean and standard deviation are 43 and 6.3, respectively.

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A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

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A: Let X be the random variable from normal distribution with mean (μ) = 435, standard deviation (σ) =…

Q: Assume that, for a given test, the population mean is µ=50 and the population standard deviation is…

A: given: Population mean (μ)=50 Population standard deviation (σ)=10 Sample mean (M)=54 Sample size…

Q: For a population with a mean of u = 45 and a stan- dard deviation of o = 10, what is the standard…

A: It is given that the mean is 45 and the standard deviation is 10.

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Q: 1. The test scores of an Engineering Mechanics class with 800 students are distributed normally with…

A: Given,sample size(n)=800mean(μ)=75standard deviation(σ)=7

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A: The given values are, μ=10.2,σ=0.12,n=64

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Q: For a sample of n=16 scores, what is the value of the population standard deviation (o) necessary to…

A: Given, n = 16 a) σm = 8 σm = σn8 = σ16σ = 8 * 4σ = 32

Q: Given that the random variable X is normally distributed with a mean of 80 and a standard deviation…

A: The random variable X is normally distributed with a mean of 80 and a standard deviation of 10. That…

Q: 2. What is the expected value of x? E(x) 3. What is the standard deviation? o = (Round to then…

A: 2) Expected value E(x) is calculated by Exip(xi) = 5*0.60+10*0.40 =7 Or 5*0.60-10*0.40 =-1

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Q: 1) A private entity has recorded that the population average of unemployed persons per year in a…

A: From the given information n = 100 μ=230 x=24 σ=2

Q: A population has a standard deviation of 8. What is the minimum sample size needed to estimate a…

A: Given : Margin of error, ME = 2.0 population standard deviation, σ = 8.0…

Q: For a normally distributed population with a mean of u = 70 and a standard deviation of o = 10, what…

A: According to the given information, we have Mean = 70 Standard deviation = 10 Sample size, n = 64

Q: 5. In a population with m = 65 and s = 6, Fred is 1 ½ standard deviations above the mean, John's…

A: Hi there! Thanks for posting the question. Since there are multiple questions, we will solve one…

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A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: A population has a standard deviation of 16. If a sample of size 64 is selected from this…

A: Correct answer is (B) 0.6826

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.