Question

In: Statistics and Probability

Although older Americans are most afraid of crime, it is young people who are more likely...

Although older Americans are most afraid of crime, it is young people who are more likely to be the actual victims of crime. It seems that older people are more cautious about the people with whom they associate. A national survey showed that 10% of all people ages 16-19 have been victims of crime.† At Jefferson High School, a random sample of

n = 68 students

(ages 16-19) showed that

r = 9

had been victims of a crime. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value a small amount and thereby produce a slightly more "conservative" answer.

(a) Do these data indicate that the population proportion of students in this school (ages 16-19) who have been victims of a crime is different (either way) from the national rate for this age group? Use

α = 0.05.

Do you think the conditions

np > 5

and

nq > 5

are satisfied in this setting? Why is this important?

(i) What is the level of significance?

What is the value of the sample test statistic? (Round your answer to two decimal places.)

(b) Find a 95% confidence interval for the proportion of students in this school (ages 16-19) who have been victims of a crime.

lower limit    
upper limit    


(c) How large a sample size should be used to be 95% sure that the sample proportion p̂ is within a margin of error

E = 0.05

of the population proportion of all students in this school (ages 16-19) who have been victims of a crime? Hint: Use sample data p̂ as a preliminary estimate for p. (Round your answer up to the nearest student.)
students

Solutions

Expert Solution

(a)

(a) (i) What is the level of significance? 0.05

The null and alternate hypotheses:

H0: p = 0.10; H1: p ≠ 0.10

(ii) The standard normal, since np > 5 and nq > 5.

The test statistics is: z =0.89

(iii) The p-value is 0.3735

(iv) At the α = 0.05 level, we fail to reject the null hypothesis and conclude the data are not statistically significant.

(v)There is insufficient evidence at the 0.05 level to conclude that there is a difference from the national average for the population proportion of crime victims.

(b)

(c)

orchestra answered 2 years ago
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