T6.13. Ed and Adelaide attend the same high school, butare in different math classes. The time E that it takes Edto do his math homework follows a Normal distributionwith mean 25 minutes and standard deviation 5 minutes.Adelaide's math homework time A follows a Normal dis-tribution with mean 50 minutes and standard deviation10 minutes.(a) Randomly select one math assignment of Ed's and onemath assignment of Adelaide's. Let the random variable Dbe the difference in the amount of time each student spenton their assignments: D = A – E. Find the mean and thestandard deviation of D. Show your work.(b) Find the probability that Ed spent longer on his assign-ment than Adelaide did on hers. Show your%3D-

Solution: Let E be the Ed's math homework has a normal distribution with mean 25 minutes and…

Answered: T6.13. Ed and Adelaide attend the same…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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c and d part only
Airfares Each year a company must send 3 officials to ameeting in China and 5 officials to a meeting in France. Airline ticket prices vary from time to time, but the com-pany purchases all tickets for a country at the same price. Past experience has shown that tickets to China have amean price of $1000, with a standard deviation of $150,while the mean airfare to France is $500, with a standarddeviation of $100.a) Define random variables and use them to express thetotal amount the company will have to spend to sendthese delegations to the two meetings.b) Find the mean and standard deviation of this total cost. c) Find the mean and standard deviation of the dif-ference in price of a ticket to China and a ticket to France.d) Do you need to make any assumptions in calculatingthese means? How about the standard deviations?
A scientist claims that pneumonia causes weight loss in mice. The table shows the weights (in grams) of six mice before infection and two days after infection. At a=0.05, is there enough evidence to support the scientist's claim? Assume the samples are random and dependent, and the population is normally distributed. Mouse 1 4 6. Weight (before) Weight (after) 20.8 22.4 21.7 23.6 19.6 19.9 20.8 22.5 21.5 23.7 19.5 19.8 1) Find the standardized t test 2) Find the P-value 3) Decide whether to reject or fail to reject the null hypothesis. 4) Interpret the decision in the context of the original claim. 19,600
Solve for C
A2
Listed in the accompanying table are waiting times (seconds) of observed cars at a Delaware inspection station. The data from two waiting lines are real observations, and the data from the single waiting line are modeled from those real observations. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b). One Line Two Lines 64.1 733.6 64.3 865.2 157.2 605.8 215.8 1089.7 142.2 267.8 85.6 662.7 278.9 310.2 339.6 518.1 253.2 128.8 199.5 565.6 475.7 132.9 630.3 268.2 478.2 122.1 333.1 350.4 473.5 128.9 328.9 95.2 402.1 232.7 914.6 99.7 721.6 461.2 552.8 162.7 760.7 482.2 596.7 100.6 692.3 518.1 837.1 508.5 903.1 580.2
Q3.a. Find out the variance of first n natural numbers. b. The arithmetic mean of two non-negative numbers is 5. Find out its standard deviation?
Chapter 7: 6. The mean room and board expense per year at a four-year college is $9200. Assume the room and board expenses are normally distributed with a standard deviation of $1200. (6 points each) You randomly select one four-year college. What is the probability that their average room and board is less than $8950? b. You randomly select 50 four-year colleges. What is the probability that the mean average room and board is less than $8950?
Exploration 4. Assume that 5 students taking a statistics course having the following ages: 17 33 29 20 45 Mean a. Find the mean and population standard deviation of the data set of ages. Standard Deviation b. Assume that random samples of size n = 2 are selected with replacement. Make a list of all of the possible samples of size 2. They are selected with replacement, i.e. the same student could be chosen twice. Also, selecting the age of 17 first and 33 second is different from selecting 33 first and 17 second. You need to make a list of all the possible outcomes (there should be 25.....) Find the mean of each sample and construct a table representing the sampling distribution of the mean.
"An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to 858 hours and a standard deviation of 54 hours. Random samples of 50 bulbs are drawn from this population, and the mean of each sample is determined. What is the mean of the mean of the sampling distribution?" 858 B 8 54 D) 50
need the solve asap plz
16

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