Based on the sample results in Exercise 10.109, construct and interpret the 95% confidence interval for the population proportion. Is the hypothesized proportion (0.25) within the interval? Given the presence or absence of the 0.25 value within the interval, is this consistent with the findings of the hypothesis test conducted in Exercise 10.109?
In exercise 10.109
According to the U.S. Department of Justice, 25% of violent crimes involve the use of a weapon. We will assume that data file XR10109 contains a sample of the crime information for a given city, with data for the 400 crimes coded as 1 = crime involved a weapon and 2 = crime did not involve a weapon.
A computer and statistical software.