Statistical Concepts:

Data Simulation

Discrete Probability Distribution

Confidence Intervals

Calculations for a set of variables

Open the class survey results that were entered into the MINITAB worksheet.

We want to calculate the mean for the 10 rolls of the die for each student in the class. Label the column next to die10 in the Worksheet with the word mean. Pull up Calc > Row Statistics and select the radio-button corresponding to Mean. For Input variables: enter all 10 rows of the die data. Go to the Store result in: and select the mean column. Click OK and the mean for each observation will show up in the Worksheet.

We also want to calculate the median for the 10 rolls of the die. Label the next column in the Worksheet with the word median. Repeat the above steps but select the radio-button that corresponds to Median and in the Store results in: text area, place the median column.

Mean Median

3.2 3.5

4.5 5.0

3.7 4.0

3.7 3.0

3.1 3.5

3.6 3.5

3.1 3.0

3.6 3.0

3.8 4.0

2.6 2.0

4.3 4.0

3.5 3.5

3.3 3.5

4.1 4.5

4.2 5.0

2.9 2.5

3.5 4.0

3.7 3.5

3.5 3.0

3.3 4.0

Calculating Descriptive Statistics

Calculate descriptive statistics for the mean and median columns that where created above. Pull up Stat > Basic Statistics > Display Descriptive Statistics and set Variables: to mean and median. The output will show up in your Session Window. Print this information.

Descriptive Statistics: Mean, Median

Variable N N* Mean SE Mean StDev Minimum Q1 Median Q3 Maximum

Mean 20 0 3.560 0.106 0.476 2.600 3.225 3.550 3.775 4.500

Median 20 0 3.600 0.169 0.754 2.000 3.000 3.500 4.000 5.000

Calculating Confidence Intervals for one Variable

Open the class survey results that were entered into the MINITAB worksheet.

We are interested in calculating a 95% confidence interval for the hours...

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