Download Stats 121

Stats 121
Lab 2: Histograms and Some Functions
FIRST – download the appropriate data file.
PART 1 - Histograms in Excel
1. To find Histograms in Excel, go under TOOLS, DATA ANALYSIS,
HISTOGRAM.
2. Note that the term “bin” is what Excel uses to mean interval.
3. Using the downloaded file (from course webpage), create 3 Histograms:
a. Create a histogram of the Data on Fish Lengths (Sheet 1). Let Excel pick
the size of the bins.
b. Create a histogram with bin size 20 mm.
c. Create a histogram with bin size 10 mm.
Part 2 – Some Other Functions
1.
Using excel functions, calculate the following for the fish lengths:
Sum
=sum(input_range) (see below for example)
Mean
=average(input_range)
Standard deviation
=stdev(input_range)
Median
=median(input_range)
First quartile
=quartile(input_range,1)
Second
=quartile(input_range,2)
Third quartile
=quartile(input_range,3)
Note: Set up your spreadsheet in the following style:
Function
Sum
Mean
…
Function Value
8360
403
…
Formula
=sum(A6:A29)
=average(A6:A29)
…
Part 3 – Some other functions cntd’…
1. Use the data on Sheet 2 for the following.
2. Sort the data in descending order.
3. WITHOUT using excel, calculate the Median, First Quartile, Third Quartile, and
IQR (the difference between the 1st and 3rd quartiles).
4. WITH Excel, calculate the Median, First Quartile, and the Third Quartile. Set up
your spreadsheet in the same style as Part 2.
5. Calculate the Standard Deviation (using the definition). Use the following setup:
Mutual Fund
Deviation from Mean
Deviations Squared
Sum of deviations squared
Variance (sum of deviations squared, divided by n-1)
Standard Deviation (square root of variance)