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I sent you an assignment last week and when My prof. and I checked it, It had about 4 T/F mistakes and another 3 mistakes in the other Qs. So please try to help me answer this assignment correctly, also I'm asking for a better price since the last one had lots of mistkes. Document Preview: Assignment-5 due by Midnight (11:59pm) Sunday, April 17th, 2011 (Chapters 9 and 10) True/False questions carry 1.5 points each, Multiple Choices carry two points each and the Essay type questions carry 5 points each. The total score is 50 points. I will round up if your total score is in decimals. True/False (1.5 points each) Chapter 9 1. The manager of the quality department for a tire manufacturing company wants to know the average tensile strength of rubber used in making a certain brand of radial tire. The population is normally distributed and the population standard deviation is known. She uses a Z test to test the null hypothesis that the mean tensile strength is 800 pounds per square inch. The calculated Z test statistic is a positive value that leads to a p-value of .005 for the test. If the significance level()is .01, the null hypothesis would be rejected. 2. You cannot make a Type I error when the null hypothesis is true. 3. When the null hypothesis is not rejected, there is no possibility of making a Type II error. 4. The level of significance indicates the probability of rejecting a false null hypothesis. Chapter 10 5. In an experiment involving matched pairs, a sample of 13 pairs of observations is collected. The degree of freedom for the t statistic is 11. 6. When comparing two population means based on independent random samples, the pooled estimate of the variance is used if both population standard deviations are known 7. When comparing two independent population means, if n1=14 and n2=14, degrees of freedom for the t statistic is 26. 8. In testing the difference between the means of two independent populations, if neither population is normally distributed, then the sampling distribution of the difference in means will be approximately normal provided that the sum of the sample sizes obtained from the two populations are at least 30. Multiple choices (2 points each) Chapter 9 1. If a null hypothesis is rejected at a significance... Attachments: Assignment5-d....docx Apr 16 2011 08:31 PM


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