A7.2 MINITAB

FIGURE A7.2 Minitab Uniform Distribution Dialog Box A7.2 MINITAB To develop a simulation of the sampling distribution of the mean from a uniformly distributed population with 100 samples of n = 30, select Calc Random Data Uniform. In the Uniform Distribution dialog box (see Figure A7.2): 1. Enter 100 in the Generate rows of data edit box. 2. Enter C1–C30 in the Store in column(s): edit box. 3. Enter 0.0 in the Lower endpoint: edit box and 1.0 in the Upper endpoint: edit box. Click the OK button. One hundred rows of values are now entered in columns C1–C30. To calculate row statistics for each of the 100 samples, select Calc Row Statistics, then in the Row Statistics dialog box (see Figure A7.3): 1. Select the Mean option button. 2. Enter C1–C30 in the Input variables: edit box. Enter C31 in the Store result in: edit box. Click the OK button. The mean for each of the 100 samples is stored in column C31. To compute statistics for the set of 100 sample means, select Stat Basic Statistics Display Descriptive Statistics. Enter C31 in the Variables: edit box. Click the OK button.

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Transcript of A7.2 MINITAB

FIGURE A7.2 Minitab Uniform Distribution DialogBox

A7.2 MINITABTo develop a simulation of the sampling distribution of themean from a uniformly distributed population with 100samples of n = 30, select Calc Random DataUniform. In the Uniform Distribution dialog box (seeFigure A7.2):

1. Enter 100 in the Generate rows of data edit box.2. Enter C1–C30 in the Store in column(s): edit box.3. Enter 0.0 in the Lower endpoint: edit box and 1.0 in the

Upper endpoint: edit box. Click the OK button.

One hundred rows of values are now entered incolumns C1–C30. To calculate row statistics for each of the100 samples, select Calc Row Statistics, then in theRow Statistics dialog box (see Figure A7.3):

1. Select the Mean option button.2. Enter C1–C30 in the Input variables: edit box. Enter

C31 in the Store result in: edit box. Click the OKbutton.

The mean for each of the 100 samples is stored in columnC31. To compute statistics for the set of 100 sample means,select Stat Basic Statistics Display DescriptiveStatistics. Enter C31 in the Variables: edit box. Click theOK button.

BEREMC07_0131536869.QXD 1/24/05 8:13 PM Page 256

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FIGURE A7.3 Minitab Row Statistics Dialog Box

To generate a histogram of the 100 sample means,select Graph � Histogram and do the following:

1. In the Histograms dialog box, select Simple. Click theOK button.

2. In the Histogram–Simple dialog box, enter C31 in theGraph variables: edit box. Click the OK button.

To produce a simulation of the sampling distribution ofthe mean for a normal population, select Calc �

Random Data � Normal. Enter a value for µ in theMean: edit box and for σ in the Standard deviation: editbox. Follow the remainder of the instructions given forthe uniform population.

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