UFREE01 3 TAB LEtex >C secure ::: AppsLser Login ×/WeBWorK : Math243 Fallx,eCheg
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UFREE01 3 TAB LEtex >C secure ::: AppsLser Login ×/WeBWorK : Math243 Fallx,eChegg Study | Guided S: x RMessenger (5) Bianca Ryan Why C × https://webwork uoregon.edu/webwork2/Math243Fall Usher/ W9/5/?effect vel ser-tca ney4&user-tcarney48; key-sCG8KL frdkAircOreUM60cnBiAEFw60 NEW Rent as ArbiterSports com University of Oregon O canas e chegg Study GuideWebwork SMMRY Summarize (5 YouTube O Fro Hots com Fro » User Settings Previous Problem List Next Grades (1 point) Problems (a) You are thinking of using a t procedure to test hypotheses about the mean of a population using a significance level of 0.05. You suspect the distribution of the population is not normal and may be moderately skewed. Which of the following statements is correct? A. You may use the t procedure, provided your sample size is large, say at least fifty B. You may use the t procedure, but you should probably only claim the significance level is 0.10 C. You may not use the t procedure. t procedures are robust to nonnormality for confidence intervals but not for tests of hypotheses. D. You should not use the t procedure because the population does not have a normal distribution. Problem 1 Problem 2 Problerri 3... Problem4 Problem 5 Problem 6 Problem 7 Problem 8 Problem 9 Problem 10 Problem 11 Problem 12 Problerr 13 Problem 14 (b) Suppose we were not sure if the distribution of a population was normal. In which of the following circumstances would we NOT be safe using a t procedure? A. A histogram of the data shows moderate skewness. B. A stemplot of the data has a large outlier C. The mean and median of the data are nearly equal D. The sample standard deviation is large (c) Which of the following is an example of a matched pairs design? A. A teacher compares the pre-test and post-test scores of students. B. A teacher compares the scores of students using a computer based method of instruction with scores of other students using a traditional method of instruction. C. A teacher compares the scores of students in her class on a standardized test with the national average score D. A teacher calculates the average scores of students on a pair of tests and wishes to see if this average is larger than 80% ShowX 8:37 PM Type here to search 11/20/2017 74Explanation / Answer
Ans:
When the population standard deviation is unknown, one uses s to estimate the population standard deviation. The resulting interval is the one sample t-interval. Conditions to use the t-interval are:
a)option A is correct(we can use procedure for larger sample size say>=50)
b)Option B is correct(if data has large or extrem outlier that we can not remove,we can not use t test)
c)Option A is correct(teacher compares the pr etest and post test scores of the students.
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