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1. A social scientist would like to use a pictogram in comparing the number of violent crimes against persons in 2006 with the comparable figure for 1960. Consider- ing that she can select from a wide variety of symbols to demonstrate these frequencies, suggest several possible symbols that would tend to underscore the violence and/ or human tragedy of such crimes.
(DATA SET) Note: Exercises 2.64-2.72 require a computer and statistical software.
2. If possible with your statistical software, construct a dotplot for the data of Exercise 2.56 (use data fileXR02056). Are there any cities for which the record high temperature is so high that it would appear to be an outlier? If so, which one(s)?
a the access code for a security system consists of five positions. the first position can be any letter 26 while each
a set of blocks painted three colors is on a table in front of you some in bag 1 and some in bag 2. the colors are blue
Set up a hypothesis test to validate this claim. Using a significance level of .01 to test this hypothesis, what is your decision rule
The local municipality claims that since the percentage of intersections that had an accident last year decreased from the prior year, the city is now safer. What are the hypotheses for this situation? Is the city really safer?
question the annual commissions earned by sales representatives of machine products inc. a manufacturer of light
a random sample of 44 unlv students is taken. the average age in the sample was 20.2 years with a standard deviation of
Probability using Z-score.Find the probabilities that a random variable Z having a standard normal distribution will take on a value.
Use a 0.05 significance level to test the claim that whether the subject lies is independent of the polygraph indication. What do the results suggest about the effectiveness of polygraphs?
For a standard normal curve, find the z-score that separates the bottom 30% from the top 70%
no children which is equal to value obtained by census. Give z statistic (rounded to two decimal places) and P-value. What do you conclude? (Use = 0.10.).
Assume that you choose a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
In this problem set you will get some practice performing hypothesis tests for two samples. If you use Statdisk to perform any portion of these analyses, please include the results, label them, and refer to them accordingly in your interpretations..
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