LA. What is the Z score for a person who watches more than 8 hours per day?
B. What proportion of people watch television less than 5 hours per day? How many does this correspond to in the sample?
C. What number of television hours per day corresponds to a Z score of +1?
D. What is the percentage of people who watch between 1 and 6 hours of television per day?
Question 2:
“C5. We report the average years of education for GSS18SSDS-B respondents by their social class—lower, working, middle, and upper. Standard deviations are also reported for each class.”
Please see chart for this question in files
A. Assuming that years of education is normally distributed in the population, what proportion of working-class respondents have 12 to 16 years of education? What proportion of upper-class respondents have 12 to 16 years of education?
B. What is the probability that a working-class respondent, drawn at random from the population, will have more than 16 years of education? What is the equivalent probability for a middle-class respondent drawn at random?
C. What is the probability that a lower-class respondent will have less than 10 years of education?
Question 3:
“C7. The standardized IQ test is described as a normal distribution with 100 as the mean score and a 15-point standard deviation.
A. What is the Z score for a score of 150?
B. What percentage of scores are above 150?
C. What percentage of scores fall between 85 and 150?
D. Explain what is meant by scoring in the 95th percentile. What is the corresponding score?
Question 4:
C9. The Hate Crime Statistics Act of 1990 requires the attorney general to collect national data about crimes that manifest evidence of prejudice based on race, religion, sexual orientation, or ethnicity, including the crimes of murder and nonnegligent manslaughter, forcible rape, aggravated assault, simple assault, intimidation, arson, and destruction, damage, or vandalism of property. The Hate Crime Data collected in 2007 reveal, based on a randomly selected sample of 300 incidents, that the mean number of victims in a particular type of hate crime was 1.28, with a standard deviation of 0.82. Assuming that the number of victims was normally distributed, answer the following questions:
A. What proportion of crime incidents had more than two victims?
B. What is the probability that there was more than one victim in an incident?
C. What proportion of crime incidents had fewer than four victims?””
