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1. Elementary statistical methods.

by Walker, Helen Mary, 1891-, Walker, Helen Mary, 1891- | Lev, Joseph, 1903-, Lev, Joseph, 1903-.

Edition: Rev. ed. / [by] Helen M. Walker [and] Joseph Lev. Rev. ed. / [by] Helen M. Walker [and] Joseph Lev.Material type: book Book; Format: print Publisher: New York : Holt, Rinehart & Winston, [1958]Availability: No items available

2. Statistical inference [by] Helen M. Walker [and] Joseph Lev.

by Walker, Helen Mary, 1891-, Walker, Helen Mary, 1891- | Lev, Joseph, 1903-, Lev, Joseph, 1903-.

Material type: book Book; Format: print ; Literary form: Not fiction Publisher: New York, Holt [1953]Availability: No items available

3. Statistical inference [by] Helen M. Walker [and] Joseph Lev.

by Walker, Helen Mary, 1891-, Walker, Helen Mary, 1891- | Lev, Joseph, 1903-, Lev, Joseph, 1903-.

Material type: book Book; Format: print ; Literary form: Not fiction Publisher: New York, Holt [1953]Availability: No items available