STAT 1034 Unit 1: Introduction to Statistics textbook sections 1.1 - 1.4 Unit 1 Learning Goals: •understand the difference betweensampleandpopulation •understand the difference betweensurveyandcensus •identify whether or a survey isvoluntaryormandatory •distinguish betweenparameterandstatistic •distinguish betweenquantitativeandcategoricaldata •distinguish betweendiscreteandcontinuousdata •understand the difference betweenstatisticalandpractical significance •identify which type of sampling is used betweenrandom, systematic, convenience, stratified, orcluster •be able to perform excel basic functions and save an excel document •activate Analysis Toolpak in excel Unit 1 Assignments: •learn unit 1 content •take Quiz #1 •complete Practice Set #1 *due dates are listed on course schedule in Canvas 1
Unit 1, Day 1 Experimental Design Step 1: Prepare What is the purpose of the study? What is the population? What sample should be surveyed? Is participation voluntary? What is the sampling method? Step 2: Analyze Can we graph the data? Are there any outliers? What statistics should be used (such as the mean)? Is there missing or misreported data? What statistical methods should be applied? Step 3: Conclude Do the results have statistical significance? Do the results have practical significance? 2
Practical versus Statistical Significance Example:Suppose a procedure called XSort is available to couples that wish to conceive a baby girl.Consider the following outcomes of an experiment trial of the procedure: Trial 1:Five couples use the method and 4 out of 5 of the couples have a baby girl and one of the couples has a baby boy. Trial 2:100 couples use the method and 96 out of 100 of the couples have a baby girl and 4 of the couples have a baby boy. Trial 3:100 couples use the method and 52 out of 100 of the couples have a baby girl and 48 of the couples have a baby boy. Trial 4:100,000 couples use the method and 52% of the couples have a baby girl and 48% of the couples have a baby boy. Answers: •practically significant,not statistically significant •statistically significant,practically significant •not significantly significant,not practically significant •statistically significant,not practically significant YouTryIt!You are now ready to do Practice Set #1 problems 1-8. Please work on this for the remainder of class. 3
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