histogram....

#1
I'm also not sure about this problem:

The times (in minutes) for 42 consecutive weekdays, with the dates in order along the rows:

8.25 7.83 8.30 8.42 8.50 8.67 8.17 9.00 9.00 8.17 7.92
9.00 8.50 9.00 7.75 7.92 8.00 8.08 8.42 8.75 8.08 9.75
8.33 7.83 7.92 8.58 7.83 8.42 7.75 7.42 6.75 7.42 8.50
8.67 10.17 8.75 8.58 8.67 9.17 9.08 8.83 8.67

Okay...I made the actual histogram and I know its correct. I also made the graph for the ogive. It says to estimate the percentiles like 90th. By analyzing the graph how would I find that out and other percentiles? Would I look at the frequency on the y-axis...or...something else? Please help again. Thanks sooooooo much!!!
 
#2
Try entering the data in Excel. Use Sort to order the data by ascending order. Then try using the 'percentile' option to calculate the 90th percentile.

Take the time to learn Excel. It has many nice stats options. It can make graphs and calculate most anything you need. I like it.
 
E

elnaz

Guest
#3
Hello
i hope you can workwith SPSS because ,freqency table in SPSS will obtain every percentile that it is interesting for you , i did it, you can see it .