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A concerned group of citizens wanted to determine whether the proportion of armed robberies in...

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A concerned group of citizens wanted to determine whether the proportion of armed robberies in the state of Texas was different in 2011 than in 2010 Research shows that of the 113 231 violent crimes in Texas in 2010 7 622 of them were armed robberies In 2011 7 439 of the 104 873 violent crimes were in the armed robery category Test at the 0 01 significance level Preliminary a Is it safe to assume that n2010 5 of all violent crimes during 2010 and 72011 5 of all violent crimes during 2011 Yes No b Verify np 1 P 10 Round your answer to one decimal place n2010P 1 P n2011 1 P Test the claim a Determine the null and alternative hypotheses Ho P2010 P2011 Ha P2010 P2011 b Determine the test statistic Round to two decimal places z c Find the p value Round to four decimals p value

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