The number of successes and the sample size for a simple random sample from a population are given below. x =7, n= 28, Ho: p= 0.4, Ha: p<0.4, a = 0.01 a. Determine the sample proportion. b. Decide whether using the one-proportion z-test is appropriate. c. If appropriate, use the one-proportion z-test to perform the specified hypothesis test.

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