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Click CalcClick Random Data Click Normal Generate 30 rows of data Store in column(s): C1-C60 Mean = 80Standard deviation = 8 Click OK Minitab Random Data.

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Presentation on theme: "Click CalcClick Random Data Click Normal Generate 30 rows of data Store in column(s): C1-C60 Mean = 80Standard deviation = 8 Click OK Minitab Random Data."— Presentation transcript:

1 Click CalcClick Random Data Click Normal Generate 30 rows of data Store in column(s): C1-C60 Mean = 80Standard deviation = 8 Click OK Minitab Random Data

2 In column C1-C60, we already have the sample data. Click on StatClick on Basic Statistics Click on 1-Sample Z Confidence level = 0.95 Sigma = 8 Variables = C1-C60 Click OK Chart 9-4: Minitab Confidence Interval Estimates

3 Click on Megastat Click on Probability Click on Continuous Probability Distributions Select t- distribution Select Calculate probability given t Enter value of t (= 2.4 in our case) Enter degree of freedom (= 10 in our example) Click OK Chart 9-6: Excel Finding Area under a T-Curve

4 In column C1, input the value of t (in our example, t = 2.4) Click on Calc Click on Probability Distributions Click on t Select Cumulative Probability Enter degrees of freedom (in our example, 10) Input column = C1Optional storage = C2 Click OK Chart 9-7: Minitab Finding Area under a T-Curve

5 Chart 9-8: Excel Obtaining a Confidence Interval Input sample data in Column A Click on Tools Click on Data Analysis Select Descriptive Statistics Click OK Select the range of sample data in Column A as the Input Range Select Summary statistics Select Confidence Level for Mean and input desired level of confidence (95 in our case) Click OK

6 In column C1, input the sample data Click on StatClick on Basic Statistics Click on 1- Sample t Enter Confidence level = 0.95 Enter Variables = C1 Click OK Chart 9-9: Minitab Obtaining a Confidence Interval

7 Input the 0/1 data in column A and find the sample mean x, which is same as sample proportion, p. Click on MegaStat Click on Confidence Intervals / Sample Size Click on Confidence interval - p Input p = the value from step 1 (in our case is 0.55) Input n = the sample size (= 20) Input confidence level = 0.95 Click OK Chart 9-10: Excel Confidence Interval Estimates

8 Click StatClick Basic Statistics Click 1 Proportion Click OptionsEnter Confidence level = 95.0 Select Use text and interval based on normal distributions Click OKEnter Sample in columns C1 Click OK Chart 9-11: Minitab Confidence Interval Estimates


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