Chapter 08, Section 8.2, Problem 025A city planner wants to estimate, with a 90% confidence level, the average monthly residential water usage in the city. Based on earlier data, the population standard deviation of the monthly residential water usage in thiscity is 387.40 gallons. How large a sample should be selected so that the estimate for the average monthly residential water usage in this city is within 105 gallons of the population mean?Round your answers to the nearest integer.the tolerance is +/-5% Chapter 08, Section 8.3, Problem 041Almost all employees working for financial companies in New York City receive large bonuses at the end of the year. A sample of 65 employees selected from financial companies in New York City showed that they received anaverage bonus of $51.000 last year with a standard deviation of $20.000. Construct a 99% confidence interval for the average bonus that all employees working for financial companies in New York City received last year.Round your answers to cents.to $

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Answered: Chapter 08, Section 8.2, Problem 025 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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EXPERIMENT 1: A researcher believes that on average women weigh less today than during the renaissance period around the 15th to 16th centuries. To investigate this belief, a random sample of 41 adult wômen is chosen and their weights are recorded. The mean weight of the sample is 111 pounds with a standard deviation of 12.4 pounds. Based on historical records and paintings of women from the renaissance, it is determined that the average weight of an adult women from that period would have been about 115 pounds.
chapter 10 problem 16, I need help with the last part of this problem. thanks
QUESTION 3 A hardware store determined the current balances for a random sample of 100 customers with non-zero balances. The sample mean of the amount owed was $100.00 and the standard deviation was $25. Use the assumption that the sample standard deviation is equal to the population standard deviation. How many customers should be included in the sample if the desired 95% confidence interval has a desired error margin E of $2.00?
Question 03: Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time for a sample of 10 men was 35 minutes per day. The standard deviation was 10 minutes per day. The mean listening time for a sample of 12 women was also 35 minutes, but the standard deviation of the sample was 12 minutes. At the .10 significance level, can we conclude that there is a difference in the variation in the listening times for men and women?
Chapter 08, Section 8.3, Problem 044 The mean time taken to design a house plan by 38 architects was found to be 20 hours with a standard deviation of 3.70 hours. X Incorrect. a. Construct a 95% confidence interval for the population mean u. Round your answers to two decimal places. to hours
question 2b. The annual yield (expressed as a percentage) for all investments in a particular asset class in the latest financial year was normally distributed with a mean of 4.5% and a standard deviation of 1.25%.i. Represent the probability that a randomly selected investment in this class will have an annual yield greater than 6.00%on a diagram and determine this probability. ii. Represent the value for annual yield that only 10% of investments in this class exceed on a diagram and determine this value.
Question 2 The Warren County Telephone Company claims in its annual report that “the typical customer spends $60 per month on local and long distance service”. A sample of 12 subscribers revealed the following amounts spent last month. $64 $66 $64 $66 $59 $62 $67 $61 $64 $58 $54 $66 a. What is the point estimate of the population mean? b. Develop a 90% confidence interval for the population mean. c. Is the company’s claim that the “typical customer” spends $60 per month reasonable? Justify your answer. Note: 1.please clear answer no whois one (a),(b) & (c) 2. No need excel formula!
Questions 3) Unsure of how many people drive by your house each day, and with plenty of time at home now, you decide to find out. Not wanting to spend everyday sitting in your front yard you decide to randomly select 10 days. In your sample you find an average of 153 cars drive by per day. The sample also shows a standard deviation of 20 cars. What is the best guess for the mean cars per day? Give a 90% Confidence Interval. Let’s say you know for certain the population standard deviation is 20 cars. What is your best guess now? What is the 90% confidence interval now? Are your answers from part c) different than a) and b)? If so, Why?
QUESTION 11 Provide an appropriate response. A local bank needs information concerning the savings account balances of its customers. A random sample of 15 accounts was checked. The mean balance was $686.75 with a standard deviation of $256.20. Find a 98% confidence interval for the true mean. Assume that the account balances are normally distributed. Round to the nearest cent. ($487.31, $563.80) ($513.17, $860.33) O ($326.21, $437.90) O($238.23, $326.41)
Inventory Costs.Three firms carry inventories that differ in size. Firm A’s invent-ory contains 2000 items, firm B’s inventory contains 5000 items, and firm C’s inventory contains 10,000 items. The population standard deviation for the cost of the items in each firm’s inventory is s=144. A statistical consultant recommends that each firm take a sample of 50 items from its inventory to provide statistic-ally valid estimates of the average cost per item. Managers of the small firm state that because it has the smallest population, it should be able to make the estimate from a much smaller sample than that required by the larger firms. However, the consultant states that to obtain the same standard error and thus the same precision in the sample results, all firms should use the same sample size regardless of population size. a.Using the finite population correction factor, compute the standard error for each of the three firms given a sample of size 50. b.What is the probability that for…

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