Question

A criminologist conducts a survey of residents concerning their sense of safety when walking alone in their neighborhoods. She uses a 7-point scale from 1 = very unsafe to 7 = very safe. Using the chart below, answer the following questions. For A and B, you may want to consult the previous assignment.

Perceptions of Safety	f
1	28
2	34
3	42
4	56
5	46
6	24
7	20
Total	N = 250

1.) Construct a 99% confidence interval and interpret it (note: this would involve you writing a sentence explaining what the two values tell you). (0.5 point).

Answer 1

Given:

A criminologist conducts a survey of residents concerning their sense of safety when walking alone in their neighborhoods.

She uses a 7-point scale from 1 = very unsafe to 7 = very safe.

xi	fi	fi × xi	fixi2
1	28	28	28
2	34	68	136
3	42	126	378
4	56	224	896
5	46	230	1150
6	24	144	864
7	20	140	980
	N = 250	fixi = 960	fixi2 = 4432

Therefore when the n sample of sample size is a drawn from normally distributed population then there is 99% chance that true population parameter will fall within (3.5587, 4.1213)