2. The town of Sylva recently started a single-stream recycling program. The town provided60-gallon recycling bins to 25 randomly selected households and 75-gallon recycling binsto 22 randomly selected households. The total volume of recycling over a 10-week periodwas measured for each of the households. The average total volumes were 382 and 415gallons for the households with the 60- and 75-gallon bins, respectively. The samplestandard deviations were 52.5 and 43.8 gallons, respectively. Assume that the 10-weektotal volumes of recycling are approximately normally distributed for both groups and thatthe population standard deviations are equal. Using a 2% significance level, can youconclude that the average 10-week recycling volume of all households having 60-galloncontainers is different from the average volume of all households that have 75-galloncontainers?If This Problem Calls for:Pooled Variance TestSeparate Variance TestUse Test Statistic-2.321-2.348Use Degrees of FreedomCalculate your owndf-443. Reconsider the town of Sylva's recycling program. Re-test the hypothesis assuming that thepopulation standard deviations are different.

The question is about hypo. testing Given : No. households to which 60 gallons recycling bins…

Answered: 2. The town of Sylva recently started a…

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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A semiconductor manufacturer produces devices used as central processing units in personal computers. The speed of the devices (in megahertz) is important because it determines the price that the manufacturer can charge for the devices. The following table contains measurements on 120 devices. a. Calculate the sample mean, sample variance, and standard deviation. b. Find the median and quartiles for the data. c. Construct a box plot of the data. Find the interquartile range and determine the number of outliers
2. Maple tree diameters in a forest area are normally distributed with mean 10 inches and standard deviation 2.2 inches. Find the proportion of trees having a diameter greater than 15 inches. Answer:
An operations manager wants to know whether the maintenance of a filling machine for 2 litre milk bottles has made a difference in the average fill of the milk bottle. She randomly selects 25 bottles before the maintenance service, and 25 bottles after the maintenance service has taken place. The resulting SPSS output is shown below: Paired Samples Statistics Mean N Std. Deviation Std. Error Mean Pair 1 After Service 2.0029 25 .01142 .00228 Before service 1.9687 25 .03193 .00639 Paired Samples Test Paired Differences t df Sig. (2- tailed) Mean Std. Deviation Std. Error Mean 95% Confidence Interval of the Difference Lower Upper Pair 1 After Service – Before service .03420 .03503 .00701 .01974 .04866 4.882 24 .000 Question: Based on the output choose the most accurate answer
A concrete mix is designed to withstand 3000 pounds per square inch (psi) of pressure. The following data represent the strength of nine randomly selected casts (in psi). 3970, 4100, 3100, 3200, 2950, 3820, 4100, 4050, 3470 Compute the mean, median and mode strength of the concrete (in psi).
Given two samples with sample size, mean, and standard deviation as: sample 1: 9, 100 cm, 5cm; sample 2: 16, 80 cm, 6 cm. Please calculate standard error of the difference between the two means
An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for each of the four crashes was $421, $469, $416, $232 Compute the range, sample variance, and sample standard deviation cost of repair.
Calculate the range, variance and standard deviation for the following sample data. Scores: 10, 7, 9, 1, 2, 0, 6
Salvatore, as the director of a regional bank, is concerned about the wait times of customers at the four branches. He randomly selects 48 patrons at each branch and records the waiting time for each patron. The results of the samples are shown below. The Alvrine branch has a mean waiting time of 13.49 minutes with a standard deviation of 1.97 minutes.The Durham branch has a mean waiting time of 12.61 minutes with a standard deviation of 2.89 minutes.The Hanover branch has a mean waiting time of 11.06 minutes with a standard deviation of 2.46 minutes.The Mascomonet branch has a mean waiting time of 12.89 minutes with a standard deviation of 3.12 minutes.
The scores of individual students on the American College Testing (ACT), a college readiness assessment, have a Normal distribution with a mean of 18.6 and a standard deviation of 6.0. At Northside High, 36 seniors take the test. Assume the scores at this school have the same distribution as national scores. What is the mean of the sampling distribution of the sample mean score for a random sample of 36 students? 0 1 0 6
Calculate the SEM (standard error of the mean) for the following data:a. Population standard deviation = 15b. Sample size = 25
According to a government agency, the average workweek for an adult in February 2018 was 34.1 hours. Assume the population standard deviation for the number of hours worked per week is 4.0 hours. A random sample of 35 adults worked an average of 34.8 hours last week.
An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for each of the four crashes was $421, $469, $416, $232 . Compute the range, sample variance, and sample standard deviation cost of repair.

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