As a result of dog breeding for certain physical traits, many dog breeds have ch

Question

As a result of dog breeding for certain physical traits, many dog breeds have changed in the last 100 years. A dog breeder wants to measure the effects of breeding on the face length of the boxer breed using a hypothesis test. Suppose that the dog breeder has face length measurements (in inches) from a random sample of 40 female boxer dogs taken in 1915 and a random sample of 40 female boxer dogs taken in 2015. Which type of hypothesis test should the breeder use

A)Test for one population proportion

B)Test for one population mean

C)Test for a difference in two population proportions

D)Test for a difference in two population means

Explanation / Answer

Here we need to compare mean face length of dog of two independent samples. So we need two independent sample t test (or z test) will be used.

Following option is correct:

D)Test for a difference in two population means

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