John wishes to estimate the population standard deviation of salary of college graduates who took a statistics course in college. How many college graduates must he survey? Assume that he wants to be the sample standard deviation to be within 1% of the population standard deviation and to be 99% confident of that statement.

Q: The income distribution of officers of a certain company was found to follow normal distribution.…

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Q: If a population has a standard deviation of 16, what is the minimum number of samples that need to…

A: Given,standard deviation (σ)=16margin of error (E)=2α=1-0.88=0.12α2=0.06Z0.06 =1.5548

Q: n = 11 Ex=55 Ex²=2230 Give the value of the sample standard deviation.

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Q: A researcher at a major hospital wishes to estimate the average cholesterol level of the adult…

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Q: In a population of scores, X = 83 corresponds to z = 0.50 and X = 93 corresponds to z = +2.00. What…

A: We have to find mean and sd.

Q: Isn't here the standard deviation equal to 4, not 2, as the tutor wrote?

A: Solution-: Given: μ=-3,σ=4 We want to find, P(0<X<2)=? Draw the picture.

Q: Twelve percent of the world's population is left-handed. A researcher daims that left-handed…

A: Solution: From the given information, the out of 1650 artists 10% are left-handed. The population…

Q: Can you find the standard deviation for sx and sy?

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Q: Use the data to answer the following questions: 10; 11; 15; 15; 17; 22 What number is two standard…

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Q: use the following information for the question. The average travel time to work for a person living…

A: Let X denote the distribution of travel time and it follows normal distribution with mean of μ=17…

Q: Which of the following values for the population standard deviation would cause a score located…

A: Higher the standard deviation more will be the spread of the data. And the point will be farther…

Q: John wishes to estimate the population mean salary of college graduates who took a statistics course…

A: Solution: Note: Hello! As you have posted 2 different questions, we are answering the first question…

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A: Introduction: The 100 (1 – α) % confidence interval for the population mean, μ, when the population…

Q: A group of students take a Statistics Exam where the average was M = 90 and the standard deviation…

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Q: Laura learned that the average GPA in her school is 3.6 with a standard deviation of 0.3. If her GPA…

A: From the given information,   Mean = 3.6 Standard deviation = 0.3   The objective is to find the…

Q: - For all practice purposes, the normal curve has how many standard deviation units?

A: Empirical rule (68-95-99.7 rule): About 68% of data lies within the first standard deviation of the…

Q: A researcher who she’s to estimate within $2 the average repair cost for a refrigerator.  if she…

A: From the provided information, Population standard deviation (σ) = $15.25 Confidence level = 95%…

Q: Which of the below data sets has the lowest standard deviation? You do not need to calculate the…

A: The standard deviation is used to calculate the variability of the data set. It tells us that how to…

Q: A researcher reports survey results by stating that the standard error of the mean is 20.The…

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Q: A researcher wishes to determine how much money per week is spent on groceries in a small Western…

A: Given : ME< 3.0 σ= 18.0 At 98.0 % confidence level , z score= 2.326 Need to find the minimum…

Q: "The weights of 1,000 children, in average, is 64kg with standard deviation of 18kg. Suppose the…

A: Given that n=1000, mu =64 ,s.d =18 ,p(x<59 ) =?

Q: In the accompanying display (where both curves are placed on the same number line), which has the…

A: The display shows the normal curves for A and B in same number line.

Q: A group of students take a Statistics Exam where the average was M = 90 and the standard deviation…

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Q: A business owner usually requests freelancers to work with, where he pays his freelancers an average…

A: From the given information, the mean is 15.90 and standard deviation 1.50.

Q: A pharmacologist measured the concentration of dopamine in the brains of several rats.The mean…

A: Mean = 1269 Standard deviation = 145

Q: A group of students take a Statistics Exam where the average was M = 90 and the standard deviation…

A:

Q: Suppose​ 30% of the people in your town talk on their cell phones and drive at the same time. If you…

A: we have to find standard deviation.

Q: Which of the following four standard deviation values would produce the more platykurtic…

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Q: In the general population, the mean IQ is 100 with a standard deviation of 15. Dr. Robbins wants to…

A: From the provided information, Population mean (µ) = 100 Population standard deviation (σ) = 15

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

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Q: Given a scenario where n=100 and p=0.8, find the standard deviation.

A: In this case the sample size is n = 100 and p = 0.8.

Q: On a nationwide math test, the mean was 58 and the standard deviation was 4. If Roberto scored 70,…

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Q: en the name-brand drug (control group). In the control group, the deviation of 11.5 mmHG. In the t a…

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Q: A health care professional wishes to estimate the birth weights of infants. How large a sample must…

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Q: Assuming you obtained a random sample of blood glucose levels from 32 individuals from a population…

A: It is given that the mean is 120 and the standard deviation is 15.

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

A: Given n = 16  We know that the standard error of the sample mean,  σMM = σ/n     ⇒   σ =n×σMM where…

Q: Assume that the test scores from a college admissions test are normally distributed, with amean of…

A: Hence,the percentage of the people taking the test score between 400 and 500 is…

Q: Calculate the standard deviation of the data shown, to two decimal places 14 10.2 15.8 20.6 6.9 5.9

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Q: Alicia scored a 70 on her psychology quiz, but the class as a whole averaged a 40. If the standard…

A: From the provided information, Population mean (µ) = 40 Standard deviation (σ) = 10 Let X be a…

Q: suppose the average time to fill a routine prescription at a local pharmacy is 35 minutes based on…

A: Given data,Mean μ=35sd    σ=11x=48z=?

Q: The heights of 1000 students are normally distributed with a mean of 174.5 cm and a standard…

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Q: Ten percent of the world's population is left-handed. A researcher claims that left-handed…

A: Given: n=900 and p=9%=0.09. a) The mean of p^ is μp^=p=0.09

Q: In a Calculus test, the mean score is 42 and the standard deviation is 5. Assuming the scores are…

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Q: On an exam with u = 52, you have a score of X = 56. Which value for the standard deviation would…

A: We have given that µ = 52 x = 56 z-score formula is given as  z =( x - μ )/σ

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A:

Q: The standard deviation of a variable is 15. If a sample of 100 individuals is selected, what size…

A: The standard error of mean is, SE = σ/√n, where σ is the standard deviation and n is the sample…

Q: Would it be reasonable to use the standard deviation formula?

A: here  According to a gallup survey of boys 77% of boys had played computer games in the past week…

Q: Sixteen percent of the world's population is left-handed. A researcher claims that left-handed…

A: a) mean (p) = 0.16 , q = 1 - 0.16 = 0.84 , n =2100

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A: From the provided information, Population standard deviation (σ) = 6 ounces Confidence level = 98%…

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.