Two samples, one of size 14 and the second of size 13, are selected to test the difference between two population means. How many degrees of freedom are used to find the critical value

25 Degrees of Freedom

Explanation:

Significance of difference between two population means (based on sample means) is done with formula : √ [ (Σx1^2 + Σx2^2 / N1 + N2 - 2) (1/N1 +1/N2) ]

with degrees of freedom = N1 + N2 - 2

= 14 + 13 - 2

= 25

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.

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there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.