Another very useful indicator of the spread of the data is the 95% confidence in

Question

Another very useful indicator of the spread of the data is the 95% confidence interval of any specific statistic. what does this really tell you? Why is this useful? Where do you find this in SPSS? Analyze rightarrow Now use the explore command, choose the statistics option and then check the percentile box Look at your results and fill in the blanks below: 95% percentile range for duration of eruptions: What exactly does this tell you? Explain why you got a different answer for the 95% confidence interval and the 95% percentile range.

Explanation / Answer

Solution:

g) The 95% confidence interval of any specific statistics teals us that if we calculate that statistics on the basis of random samples then 95 % chance that this CI contain true value of population parameter for which we calculate the statistics

h) CI are useful because each time we calculate the statistics its value may change and hence we CI used to show it will contain value of statistics.

i) To get CI in SPSS follow the steps
Analyze>descriptive statistics >Explore the select steam- and -leaf

   

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