6. What is the Z score for any mean? What is the z score for any standard deviation?

Q: How to calculate the population standard deviation?

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Q: Hi! I don't understand this, if you can help that would be great! Assume that the salaries of…

A: Given Information: Mean, μ=$37,000Standard Deviation, σ=$5,000 To find out the cutoff salary for…

Q: 2. A reading exam was conducted for 4th grade children and 9th grade children. The 4th grade…

A: a. The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the…

Q: 2. Which is a better score: a score 82 on a test with a mean of 70 and a standard deviation of 8,…

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Q: Under what conditions can the mean of the sample be treated as a value that is from a population…

A: From the above data  under what conditions can the mean of the sample be treated as a value that is…

Q: Explain the the Chi-Squared Distribution?

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Q: A normal distribution has a mean of 100 and a standard deviation of 15. What is the median for this…

A: Given Mean μ=100, standard deviations σ=15

Q: Variance and Standard Deviation n=12 34, 28, 45, 48, 24, 41, З8, 46, 43, 29, 31, 30

A: Given data, 34,28,45,48,24,41,38,46,43,29,31,30   Mean is μ=∑xnμ=43712μ=36.4166

Q: You are a newsvendor selling San Pedro Times every morning. Before you get to work, you go to the…

A: The objective of this question is to determine the optimal number of newspapers to buy each morning…

Q: A set of test papers is normally distributed with a standard deviation of 5. If Riley scored an 83…

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Q: Why is the standard deviation of a sampling distribution smaller than the standard deviation of the…

A: According to information provided in the question, it is required to determine the reason why the…

Q: 6.True or False? The standard deviation of any data set is the equivalent of the sample variance of…

A: Standard deviation:It is the positive square root of the sample variance s2

Q: A normal distribution of scores has the following: mean = 120 standard deviation = 20 What range of…

A: given data normal distribution μ = 120σ = 20 for middle 60%  range = ?

Q: 10 10 13 14 1) Calculate the mean. 4.

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Q: At a supermarket, the mean waiting time to get to the checkout counter is 5 minutes and the standard…

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Q: A study has been conducted of the airspeed of various bird species. You would like to specify the…

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Q: How to find what numbers 89% lie between with a mean of 24 and a standard deviation of 4

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Q: n Professor Krugman's economics course, the correlation between the students' total scores prior to…

A: Solution: Given information:  Let x= The pre‑exam totals  and  y= The final‑exam scores  r= 0.5…

Q: Using the simplified version of the normal distribution, what percentage of the cases falls within 2…

A: It is given, A normal distribution with 2 standard deviation.

Q: The coefficient of variation tells you how spread out the scores are, relative to the average. The…

A: The data sets for cost of new cars and grades on test are gives, The mean can be calculated as,…

Q: Approximately, what percentage of data lies within two standard deviations from the mean?

A: Empirical rules:1) P(μ-σ<x<μ+σ)=68%2) P(μ-2σ<x<μ+2σ)=95%3) P(μ-3σ<x<μ+2σ)=99.7%

Q: The scores for a standardized test follow a normal distribution with a mean test score = 84, and…

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Q: 12. It is the square of the population standard deviation. Answer:

A: ( 12 ) It is the square of the population standard deviation .

Q: 12. Find the variance of normal distribution.

A:

Q: 14) Find the score that separates the top 80% from the bottom 20% if the Mean is 100 and the…

A: Given information Mean (µ) = 100 Standard deviation (σ) = 26 The score that separates the top 80%…

Q: A woman gave birth 310 days after a visit from her husband who was in the Navy. Assume normally…

A: Given Information: A woman gave birth 310 days after a visit from her husband who was in the Navy.…

Q: computer company daims that the employees' salary average = 5774 dollars. The standard deviation is…

A: Given data,μ=5774σ=722n=36x=5171test statistic (z)=?

Q: Using these reading scores  7, 7, 14, 9, 10, 8, 11, 14, 13, 14, 15, 15 and knowing the mean of the…

A: The data are 7, 7, 14, 9, 10, 8, 11, 14, 13, 14, 15, 15

Q: About what percentage of a normal distribution falls within 2.5 standard deviations of the mean?

A: 98.76 percentage of a normal distribution falls within 2.5 standard deviations of the mean

Q: 9. Determine whether it is usual or unusual Determine whether the score 33 is usual or unusual when…

A: We find the z score of 33

Q: How often do people who live near the beach actually visit the beach? A random sample of 25…

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