Question: I know the answer is B... just don't know how to get to it. Can you help? Thank you! A real estate company is interested

I know the answer is B... just don't know how to get to it. Can you help? Thank you!

A real estate company is interested in testing whether, on average, families in Gotham have been living in their current homes for less time than families in Metropolis have. Assume that the two population variances are equal.A random sample of 100 families from Gotham and a random sample of 150 families in Metropolis yield the following data on length of residence in current homes.

Gotham:_G = 35 months, s_G² = 900Metropolis: _M = 50 months,s_M² = 1050

Referring to Table 10-4, what is the standardized value of the estimate of the mean of the sampling distribution of the difference between sample means?

a)- 8.75

b)- 3.69

c)- 2.33

d)- 1.96

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