From previous studies it is concluded that 30 of phone numbers in a certain city...
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From previous studies it is concluded that 30 of phone numbers in a certain city are unlisted A researcher claims that the proportion is larger than 30 and decides to survey 400 working adults Test the researcher s claim at the a 0 10 significance level Preliminary a Is it safe to assume that n 0 05 of all subjects in the population Yes No b Verify np 1 p 10 Round your answer to one decimal place np 1 p Test the claim a The null and alternative hypotheses are Ho p 0 3 Ho 0 3 Ha p 0 3 Ha 0 3 Ho p20 3 Ha p 0 3 Ho p 0 3 Ha p0 3 b The test is Select an answer Ho 0 3 Ha 0 3 Ho 0 3 Ha 0 3 c Based on the sample of 400 people 32 phone numbers in a certain city are unlisted What is the test statistic Round your answer to two decimal places d What is the p value Round your answer to four decimal places
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