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# Lecture_17,_Chap_9,_Sec_2

Course Number: STAT 250, Spring 2008

College/University: George Mason

Word Count: 1190

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Chapter 9 Section 2 Confidence Intervals about a Population Mean in Practice where the Population Standard Deviation is Unknown Sullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 9 Evaluation Slide 1 of 25 Chapter 9 Section 2 Learning objectives 1 Know the properties of t-distribution 2 Determine t-values 3 Construct and interpret a confidence interval about a population mean...

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9 Chapter Section 2 Confidence Intervals about a Population Mean in Practice where the Population Standard Deviation is Unknown Sullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 9 Evaluation Slide 1 of 25 Chapter 9 Section 2 Learning objectives 1 Know the properties of t-distribution 2 Determine t-values 3 Construct and interpret a confidence interval about a population mean Sullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 9 Evaluation Slide 2 of 25 Confidence Intervals In Section 1, we assumed that we knew the population standard deviation Since we did not know the population mean , this seems to be unrealistic In this section, we construct confidence intervals in the case where we do not know the standard population deviation This is much more realistic Sullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 9 Evaluation Slide 3 of 25 Confidence Intervals If we don't know the population standard deviation , we obviously can't use the formula Margin of error = z/2 / n because we have no number to use for However, just as we can use the sample mean to approximate the population mean, we can also use the sample standard deviation to approximate the population standard deviation Sullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 9 Evaluation Slide 4 of 25 Confidence Intervals Because we've changed our formula (by using s instead of ), we can't use the normal distribution any more Instead of the normal

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George Mason - STAT - 250
Chapter 9 Section 3Confidence Intervals about a Population ProportionSullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 9 Section 3 Slide 1 of 25Confidence Intervals for Proportions Learning objectives1 Get a point es
George Mason - STAT - 250
Chapter 10Testing Claims Regarding a ParameterSullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 10 Introduction Slide 1 of 33Overview This is the other part of inferential statistics, hypothesis testing Hypothesis test
George Mason - STAT - 250
Chapter 10 Section 2Testing Claims about a Population Mean Assuming the Population Standard Deviation is KnownSullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 10 Section 2 Slide 1 of 31Hypothesis Test for Mean Known
George Mason - STAT - 250
Chapter 10 Section 4Testing Claims about a Population ProportionSullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 10 Section 4 Slide 1 of 26Population Proportion Testing Learning objectives1 Test a claim about a popu
George Mason - STAT - 250
Chapter 11Inferences On Two SamplesSullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 11 Section 1 Slide 1 of 29Overview We continue with confidence intervals and hypothesis testing for more advanced models Models compa
George Mason - STAT - 250
Chapter 11 Section 2Inference about Two Means: Independent SamplesSullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 11 Section 2 Slide 1 of 23Two Means Independent Samples Two samples are independent if the values in o
George Mason - STAT - 250
Chapter 11 Section 3Inference about Two Population ProportionsSullivan Statistics: Informed Decisions Using Data 2nd Edition Chapter 11 Section 3 Slide 1 of 26Two Population Proportions Learning objectives1 Test claims regarding two popu
George Mason - STAT - 250
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George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 1 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M01_0621.xls contained in your STAT250 folder by followin
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 2 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M02_0621.xls contained in your STAT250 folder by followin
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 3 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M03_0621.xls contained in your STAT250 folder by followin
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 4 No hand-written work will be accepted for any MINITAB Assignment! 1. A few years ago it was reported that 74.8% of adult Americans were satisfied with the job the nation's maj
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Student's Name: Homework Identification Number: 0621MINITAB Assignment 5 No hand-written work will be accepted for any MINITAB Assignment! 1. Suppose the talk time in digital mode until the battery no longer operates the phone for a certain model o
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 6 No hand-written work will be accepted for any MINITAB Assignment! 1. Consider a population of the charge life of a certain lithium ion battery for camcorders. Records show tha
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 7 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M07_0621.xls contained in your STAT250 folder by followin
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 8 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M08_0621.xls contained in your STAT250 folder by followin
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 9 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M09_0621.xls contained in your STAT250 folder by followin
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 10 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M10_0621.xls contained in your STAT250 folder by followi
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 11 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M11_0621.xls contained in your STAT250 folder by followi
George Mason - STAT - 250
Student's Name: Homework Identification Number: 0621MINITAB Assignment 12 No hand-written work will be accepted for any MINITAB Assignment! 1. Obtain your own unique set of data from the file M12_0621.xls contained in your STAT250 folder by followi
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