Before agreeing to purchase a large order of polyethylenesheaths for a particular type of high-pressure oilfilledsubmarine power cable, a company wants to seeconclusive evidence that the true standard deviation ofsheath thickness is less than .05 mm. What hypothesesshould be tested, and why? In this context, what are thetype I and type II errors?

Before agreeing to purchase a large order of polyethylenesheaths for a particular type of high-pressure oilfilledsubmarine power cable, a company wants to seeconclusive evidence that the true standard deviation ofsheath thickness is less than .05 mm. What hypothesesshould be tested, and why? In this context, what are thetype I and type II errors?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Given a normal distribution with mean = 30 and standard deviation = 6, find standardized value for X=39. 39 - (Ortalaması 30 standart sapması 6 olan bir dağılım için X=39'un standartlaştırılmış karşılığı nedir?) A) 1 B) 0.5 C) 9 D) 15 O E) 1.5
Please answer part c), d) and e)
In order to test the claim that the mean drive speed (Km/hr) of adults in a known highway in a city is at most 75 Km/hr, a sample of 40 adult drivers was taken and resulted a sample mean of 85 Km/hr. If the population standard deviation is 35 Km/hr, perform the test with a level of significance a = 0.05 using the P-value approach. 1. The mull and alternative hypotheses are A. Ho : u 75 and H : u 75 D. Ho : 2 75 and H, : p< 75 2. Test statistic value = (approximate to two decimal places) D. 1.81 A. -1.81 B. 0.29 C. 0.29 3. P-value = A. 0.0702 (approximate to four decimal places) B. 0.1404 C. 0.9298 D. 0.0351 4. The decision of the test: A. Reject Ho, there is a strong evidence that the adults mean drive speed is less than 75 Km/hr. B. Do not reject Ho, there is no evidence that the adults mean drive speed is more than 75 Km/hr. C. Reject Ho, there is a strong evidence that the adults mean drive speed is more than 75 Km/hr. D. Do not reject Ho, there is a strong evidence that the adults…
Some dairy cows receive injections of BST, a hormone intended to spur greater milk production. After the first injection, a test herd of 101 cows increased their mean daily production from 22kg to 28kg of milk. The standard deviation of the increases was1.6kg. We want to estimate the mean increase a farmer could expect in his own cows. Complete parts a) through d)
3. The braking distance for a Krazy-Car traveling at 50 mph is normally distributed with a mean of 50 ft. and a standard deviation of 5 ft. Answer the following without using a calculator or a table. • What is the likelihood a Krazy-Car will take more than 65 ft. to stop? • What is the probability a Krazy-Car will stop between 45 ft. and 55 ft.? • What percent of the time will a Krazy-Car traveling at 50 mph stop between 35 and 55 ft.? • What is the probability a Krazy-Car will require less than 50 ft. or more than 60 ft. to stop?
4] The time required for Speedy Lube to complete an oil change service on an automobile follows a normal distribution with mean of 17 minutes and standard deviation of 2.5 minutes. c] What percent of customers have service times between 10 minutes and 20 minutes? d] What interval {low?, high?) captures the middle 75% of customer service times?
Let x represent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned) shopping interval. Based on a newspaper article, the mean of the x distribution is about $34 and the estimated standard deviation is about $9. You can usee Part A and B as a reference, but I do not need help with answering them. c) Let us assume that x has a distribution that is approximately normal. What is the probability that x is between $32 and $36? (Round your answer to four decimal places.) (d) In part (b), we used x, the average amount spent, computed for 60 customers. In part (c), we used x, the amount spent by only one customer. The answers to parts (b) and (c) are very different. Why would this happen? Select one of the options: A. The standard deviation is smaller for the x distribution than it is for the x distribution. B. The mean is larger for the x distribution than it is for the x distribution. C. The standard deviation is larger for the x distribution…
An educational researcher claims that the average GPA of graduate students at FIU is less than 3.5 . To test his claim he collected data on 81 graduate students . The sample mean GPA was 3.25 with a standard deviation of 0.3 . What is the conclusion ? Group of answer choices A. Reject the null hypothesis B. Type I error C. Fail to reject the null hypothesis D. Reject the alternative hypothesis
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I need help with this problem.
It is reported that a survey had a standard error of the mean of 20, and it is assumed that the population standard deviation is 500. Using this information, determine the size of the sample that was used in this survey. a) 300 b) 200 c) 400 O d) 500 () e) None of the answers are correct
6. For a population with a standard deviation of o = 20, how large a sample is necessary to have a standard error that is: a. less than or equal to 5 points? b. less than or equal to 2 points? c. less than or equal to i pint?