Suppose an economist wishes to estimate the mean commute time, , of all people in the civilian labor force. Determine the sample size needed in order to be 95% confident that is within 5 years of the point estimate, x. Assume the population standard deviation , is 15.1 years.

Q: 4. Consider that in a population of Filipino adults ages 18 to 65, Body Mass Index (BMI) is normally…

A: Given: X~N(μ,σ)μ=28σ=6

Q: Suppose a population is known to be normally distributed with a mean, u, equal to 144 and a standard…

A: Let us consider the Population is denoted by X which is known to be normally distributed with a mean…

Q: For a population with mean 80 and standard deviation 6, what is the z-score corresponding to X = 68…

A: Given :Population mean u=80Standard deviation σ=6X=68

Q: 3. Suppose the mean blood glucose of a population of adults is 162 with a standard deviation σ=58.…

A: Given that, n=36,μ=162σ=58 The mean and standard deviation of sample mean is,

Q: An analysis of a data set (N = 16) has revealed that its standard deviation (SD) of 2. Then, what is…

A: GivenN=16standard deviation(SD)=2

Q: Suppose that wedding costs in the Caribbean are normally distributed with a mean of $8000 and a…

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

Q: Suppose that the distribution of income in a certain tax bracket is approximately normal with a mean…

A: Probability distribution: A probability distribution function is the statistical function that…

Q: A researcher wishes to estimate within $5 the average repair cost of for a refrigerator. If she…

A: Population standard deviation is 15.50. The z-critical value for 90% confidence interval is 1.645…

Q: If the sample has standard deviation 2.1, what is a reasonable approximation to the range of this…

A: It is given that the standard deviation of the data is 2.1.

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A: given: Mean=$7000 SD=$1500

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A: The provided information are: Population mean (µ) = 5.7 Population standard deviation (σ) = 1.2…

Q: Find the minimum sample size needed to be ninety seven percent confident that the true mean is…

A: Given,margin of error(E)=2.3standard deviation(σ)=7.3α=1-0.97=0.03α2=0.015Z0.015 =2.1701

Q: Suppose that the duration of a particular type of criminal trial is known to be normally distributed…

A: Given that, If X is normally distributed, X~N(21,7) Mean,mu = 21, Standard deviation, sigma=7 X =…

Q: 2. Assume that, among residents of a large (over 6,000) Florida subdivision, the population mean age…

A: From the given information, The mean age is 65 and standard deviation is 2 years.

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean…

A:

Q: Suppose, according to a 1990 demographic report, the average U. S. household spends $90 per day.…

A:

Q: Suppose that quiz scores in a beginning statistics class have a mean of 6.5 with a standard…

A: Mean(µ) = 6.5 Standard deviations (σ) = 0.5

Q: 4-A health maintenance organization (HMO) wants to estimate the mean length of a hospital stay. How…

A: The random variable length of a hospital stay follows normal distribution. The margin of error is…

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A: Given that, Mean, mu= 5.9  And standard deviation, sigma= 1.1 So X~N(5.9,1.1) In the 1st step we've…

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A:

Q: 1. Suppose that we want to estimate to within $1000 the mean salary of all graduates who were…

A: Given,margin of error(E)=1000standard deviation(σ)=5000α=1-0.95=0.05α2=0.025z0.025=1.96

Q: A researcher is interested in the decrease in adolescent BMI after a new after school program is…

A:

Q: If the manager of a bottled water distributor wants to​ estimate, with 90% ​confidence, the mean…

A: Determine the sample size n needed. Here, confidence level is 0.90.   Use EXCEL Procedure for…

Q: Suppose there is a city where the mean cost per month of a one-bedroom apartment is $1,500, with a…

A: Given: Meanμ=1500Standard deviationσ=250

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A: Central Limit Theorem:If a random sample of size n is taken from a population having mean  and…

Q: Suppose that the amount of time that takes place for the Bureau of Internal Revenue(BIR) to send…

A:

Q: If the average age of retirement for the entire population in a country is 60 years and the…

A:

Q: Suppose the mathematics SAT scores are normally distributed with a mean of 500 and a standard…

A: Given that  X~Normal(μ =500 , ? =100) X=SAT score  Z-score=(X-μ)/?

Q: The average number of moves a person make in his/her lifetime is 12 and the standard deviation is…

A: Given,sample size(n)=25mean(μ)=12standard deviation(σ)=3.5

Q: In a specific year, SAT scores were Normally distributed with mean 1026 and standard deviation 209;…

A: Solution-: (a) Given: μ=1026,σ=209 We find P(scores will be above 1300)=? (b) Given: μ=1500,σ=250 We…

Q: Suppose the distribution of typing speeds in words per minute for experienced typists can be…

A:

Q: Suppose that a study of elementary school students reports that the mean age at which children begin…

A: It is given that the standard deviation of age at which children begin reading is 0.7 years.The…

Q: Suppose that 100,000 recent grads have starting salaries which are normally distributed with a mean…

A: (d) Obtain the number of recent grads earns above $95,000. The number of recent grads earns above…

Q: The mean number of travel days per year for salespeople employed by three hardware distributors…

A:

Q: How large a sample of state employees should be taken if we want to estimate with 98% confidence the…

A: If the sample is more than 30 then we say that it is large sample test. When mean and standard…

Q: For a normally distributed data set with mean 20 and standard deviation 4.  According to the…

A: Solution-: Given: μ=20,σ=4 We want to find what percentage of the data lies between 8 and 32?

Q: For a population with a mean of 45 and a standard deviation of 10, what is the standard error of the…

A: Obtain the value of standard error for the sample of size n=4 scores.   The value of standard…

Q: Assume the annual day care cost per child is normally distributed with a mean of $7000 and a…

A: Given information: Given that the annual day care cost per child is normally distributed with mean m…

Q: Suppose that a study of elementary school students reports that the main age at which children begin…

A: From the provided information, Mean (µ) = 5.9 Standard deviation (σ) = 0.8

Q: If you draw a sample of size 10 from a population of size 35 with a population mean of 83.4 and…

A: In question, Given that you draw a sample of size 10 from a population of size 35 with a population…

Q: If the manager of a bottled water distributor wants to estimate, with 95% confidence, the mean…

A: From the provided information, Standard deviation (σ) = 0.04 Confidence level = 95%

Q: Suppose that a study of elementary school students reports that the main age at which children begin…

A: Given data: Mean = 5.9 years Standard deviation  = 0.8 years Sample size = 68

Q: Suppose a population is known to be normally distribted with a mean, μ, equal to 116 and a standard…

A: Given information- Population mean, μ = 116 Population standard deviation, σ = 14 So, the percent of…

Q: Suppose the distribution of typing speeds in words per minute for experienced typists can be…

A: Solution: Let X be the typing speed in words per minute. From the given information, X follows…

Q: When samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: Given, n = 25 μ = 100σ = 20       To find, Sampling distribution of standard deviation?

Q: Assume the annual day care cost per child is normally distributed with a mean of ​$6000 and a…

A: The detailed solution is as follows below:

Q: Assuming that the height of a college women are nobody distributed with mean 65 in and standard…

A:

Q: Suppose that the amount of time that takes place for the Bureau of Internal Revenue to send refunds…

A: Solution: 4. Let X be the amount of time. From the given information, X follows normal distribution…

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.