A librarian wants to estimate the average number of book a patron will check out over a years time. She believes from past studies the standard deviation is 20 books per year. If she samples 100 patrons, with what probability can she assert than the error in her estimate will be less than 5 books per year?

Q: What probability falls within one standard deviation of the mean?

A: It is given that the statement about to the probability falls within one standard deviation of the…

Q: Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the…

A: From the provided information, Mean (µ) = 176000 Standard deviation (σ) = 31000 X~N (176000, 31000)…

Q: Suppose you have a population of adult male basketball players and you know their mean height is 190…

A: given data normal distributionμ = 190 cmσ = 7.2 cm

Q: A professor wants to determine how the GPAs of his students in his statistics class differ from the…

A: The objective of the question is to identify the appropriate statistical test that the professor…

Q: Typed please and asap

A: Step: 1 a. To find the probability that an electric resistor has a resistance of exactly 30 ohms…

Q: need a normal probability graph n=10, p=0.5.

A: Ramdom variable x from binomial distribution with n=10 and probability p=0.5 To draw the graph by…

Q: You randomly select 25 teachers. What is the probability that their mean salary is more than $70000,…

A: Given thatRandomly select 25 teachersPopulation mean salary is 56000Standard deviation 15000To…

Q: A research firm conducted a survey to determine the average amount of money consistent smokers spend…

A: We have given that,  Let X be a random variable from normal distribution with mean(μ) = 20 and…

Q: Not everyone pays the same price for the same model of car. The mean is $22,000 and the standard…

A: Let us denote X= price of a carGiven that X follows a normal distribution with mean=22000 and…

Q: Of all the students, 44% own an iPhone, with a standard deviation of .03 If you took a sample of…

A: INTRODUCTION:  BINOMIAL DISTRIBUTION :    Let X be a discrete random variable that is said to follow…

Q: Solve the following. Show your complete solution. The amount of time that sales managers devote to…

A:

Q: If the mean height of a population of students is 68 inches with standard deviation 3 inches, what…

A: Given that      The mean height of a population of students is 68 inches with standard deviation 3…

Q: The mean GPA of university students is 2.3 with a standard deviation of 1.2. If you were to draw 36…

A:

Q: If you randomly sampled a normally - distributed population and obtained ten observations with a…

A: It is given that the population distribution is normal. If the population is normal, then the sample…

Q: Cody took his first physics exam and scored an 80. The population mean for this exam is 70, and the…

A: Solution: It is given that, Population mean, 70 Standard deviation, 5 Given that Cody took his first…

Q: Andrew plans to retire in 40 years. He plans to invest part of his retirement funds in stocks, so he…

A: The standard normal distribution is a distribution that is derived from a normal distribution. We…

Q: Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have…

A: The given situation follows binomial distribution. The proportion of people born in United States…

Q: Part 2: The probability that drivers are using their mobile phones while driving is 20%. What is the…

A: P(X=k) = C(n, k) * p^k * (1 - p)^(n - k)Where: P(X=k) is the probability of getting exactly k…

Q: According to The World Bank, only 9% of the population of Uganda had access to electricity as of…

A:

Q: A researcher wishes to estimate the average height of men for a certain region of the country. If…

A: Probability is the measure determine the likelihood of an event. Event is the outcome of an…

Q: High school girls average 80 text messages daily. Assume the population standard deviation is 15…

A: Given information:

Q: A company is considering drilling four oil wells. The probability of success for each well is 0.45,…

A: Solution: Let X be the number of success in  drilling  oil wells.  The probability of  success for…

Q: Given that the mean weight of schoolchildren's book bags is 17.5 pounds, with a standard variation…

A: We have given that Population mean = 17.5 Standard deviation = 2.2 Sample size n =30

Q: A detergent company finds that a family in the country washes an average of 910 kilograms of clothes…

A: We have given that,  Let X be the random variable from normal distribution with mean (x̄) = 910 and…

Q: The average number of pounds of red meat a person consumes each year is 196 with a standard…

A: We are given,μ = 196σ = 22n = 60

Q: A survey showed that 75% of adults need correction (eyeglasses, contacts, surgery, etc.) for their…

A: From the provided information, Sample size (n) = 11 75% of adults need correction for their eyesight…

Q: If adult millennials spend an average of $80 every year for quality young adult novels, find the…

A:

Q: Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long…

A:

Q: You are the Director of Transportation Safety. You are concerned because the average highway speed…

A: Solution-: Given: n=120,μ=60,σ=12.5  We want to find, P(X¯≥62)=?

Q: A company manufactures Samsung electronics. The mean resistance for these electronics is 1000 ohms…

A: We have yo find the probability that the mean resistance of these 50 electronics will be 1005 ohms…

Q: Please explain how to solve the following:   The Aluminum Association reports that the average…

A: we are suppose to answer three sub parts .

Q: Suppose that you have obtained data by taking a random sample from a population. Before performing a…

A: For a random sample that is selected from a population, the following steps have to be done in order…

Q: The average number of dropouts for a school district has been 300 per year with a standard deviation…

A:

Q: Suppose you have a population of adult male basketball players and you know their mean height is 190…

A: For given data , Mean : μ=190cm standard deviation : σ=7.2 cm X=height of  adult male basketball…

Q: Suppose it is known that the mean and the standard deviation for a given population are 65 ar 8,…

A:

Q: Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the…

A:

Q: The lifetime of an electronic device is modeled as an exponential random variable. If 16% of the…

A:

Q: will apply for graduate school. If the population standard deviation is 10 and the sample size is…

A: Given that  Population proportion p=25%=0.25 Sample size n =100

Q: From the past experience, 70% of the stocks are profitable. What is the probability that 5 of the 8…

A:

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.