SHORT ANSWER Write the word or phrase that best completes each statement or answ
ID: 3323850 • Letter: S
Question
SHORT ANSWER Write the word or phrase that best completes each statement or answers the question. 1) A group of researchers is interested in studying the extent of stop-and-frisk experiences in a particular neighborhood. They produce a survey of neighborhood residents that includes questions about gender ethnicity, age, attitude toward police (a scale of 5 from very positive to very negative), and number of times stopped by the police. List the variables in the survey and their levels of measurement 2) A random roadside survey of drivers in Oklahoma measured information about sex, age and drinking behavior. The table below shows the data on drivers under the age of 20 who had been drinking within the two hours before driving. Compare the probability that a male had been drinking to the probability of a female had been drinking and report the results of your comparison in two decimal places. Q: Did you drink alcohol in the last 2 hours? Male 17 122 139 Female 76 404 480 Total 93 526 619 Yes No Total Provide an appropriate response 3) when 460 junior college students were surveyed, 100 said they have a passport. Construct a 95% confidence interval for the proportion of junior college students that have a passport. Round to the nearest thousandth 4) A survey of 500 non-fatal accidents showed that 141 involved uninsured drivers. Construct a 9% oonfidence interval for the proportion of fatal accidents that involved uninsured drivers. Round to the nearest thousandth.Explanation / Answer
1)
We will pick up each variable and discuss their levels of measurements one by one.
a) Gender.
This is a nominal variable.The nominal level of measurement, symbols such as 0's or 1's, A's and B's are assigned to particular categories for the purpose naming the observation. Gender or sex are examples of nominal level variables. We use 1's for males for instance and 0's for females or vice versa, it doesn't make any difference.
b) Ethnicity.
This is also a nominal variable, the only difference is that it can have more than 2 levels. We can denote them by A, B, C etc.
c)
Age
Its an Interval-ratio level of measurement. In the interval-ratio level of measurement, the values of a variable can be rank-ordered and the differences between these values are constant.
The difference between 10 and 13 is same as between 18 and 21. 1 is smaller than 10. So we can rank age from low to high. and the difference between variables is constant.
d)
Attitude towards police
A level of 5 ranging from very positive to very negative.
This is an ordinal level of measurement.
Ordinal level variables assign numbers to rank-ordered categories ranging from low to high. Here we have ordered variables but there is no system of distance between the points.Subtraction cannot be done here as there is no sense of distance.
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