# problem-8.21

problem-8.21 Assuming the phones are a random sample from the population of all phones, this can be done with prop.test():

    > prop.test(c(14,15),c(150,125),alt="less")

            2-sample test for equality of proportions with
            continuity correction

    data:  c(14, 15) out of c(150, 125)
    X-squared = 0.2702, df = 1, p-value = 0.3016
    alternative hypothesis: less
    ...

The answer is "no."