Excel_Assignment_2_

# Excel_Assignment_2_ - University of Southern California...

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University of Southern California School of Policy, Planning, and Development PPD 404 Name: ____ Aaron Dan Instructor: Mark Velez Email: [email protected] Email: [email protected] Second Excel Assignment Using the Excel spreadsheet Nations.xls , write formulas to produce the following statistics and answer the questions below. Attach a copy of page 4 in your spreadsheet. 1. Confidence Limits In cells AE3 through AE7, enter the following: Mean= SD= Confidence Interval= LCL= UCL= In cell AF3, enter the formula for the mean (average) number of phones per 1,000 population ( PHONES ), and in cell AF4 enter he formula for the standard deviation for number of phones per 1,000 people. The formulas are: =average(array) =stdev(array) where array is the range of cells containing values for the variables PHONES . Enter the formula for the confidence interval in cell AF5. For a 95 percent confidence interval, use .05 for the value of alpha. Remember, the number of countries (N) is 24. The formula is: =confidence(.05, r3:r26, 24) Then in cells AF6 and AF7, enter your own formulas for the lower confidence level (LCL) and the upper confidence level (UCL) by first subtracting the value of the confidence interval from the value of the mean then by adding the value of the confidence interval to the mean. 1a. What is the value of the lower confidence limit (LCL)? _____263.981 1b. What is the value of the upper confidence limit (UCL)?

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• Fall '07
• Velez
• Statistics, Prediction interval, UCL, correlation coefficient df

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