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Interpreting Calculator Display The Insurance Institute of America wants to estimate the percentage of drivers aged 18-20 who drive a car while impaired because of alco- hol consumption. In a large study, 42,772 males aged 18-20 were surveyed, and 5.1% of them said that they drove in the last month while being impaired from alcohol (based on data from "Prevalence of Alcohol-Impaired Driving," by Liu, Siegel, et al, Journal of the American Medical Association, Vol. 277, No. 2). Using the sample data and a 95% confidence level, the TI-83 Plus calculator display is as shown.
a. Write a statement that interprets the confidence interval.
b. Based on the preceding result, does alcohol-impaired driving appear to be a problem for males aged 18-20? (All states now prohibit the sale of alcohol to persons under the age of 21.)
c. When setting insurance rates for male drivers aged 18-24, what percentage of alcohol-impaired driving would you use if you are working for the insurance company and you want to be conservative by using the likely worst case scenario?
Which type of correlation procedure would be most appropriate to gauge the relationship between each pair of variables and do you expect each pair of variables to be significantly correlated or not?
A random sample of 225 fathers from Littleton, yielded 97 who did not help with child care. Using a .05 level of significance test the claim that the proportion is at least 34%.
Be certain to mention what inferential statistics is and why we use it, what is random sampling, which is statistical significance and why we test it.
A cell phone company collects data from a random sample of 500 households. The results indicate that 135 of the households would add an extra cellular number, provided it was offered at a reduced monthly cost.
A coin is flipped e times and heads (h) or tails (t) are recorded:
The data below were obtained for the years 1993 through 1998 and indicate the number of fireworks (in millions) used and the related injuries. Predict the number of injuries (provided there is a significant relationship) if 100 million fireworks a..
Test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-Value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim.
find the critical values for the indicated test for a population variance sample size n and the level of significance
A professor receives, on average, 24 emails from students the day before the midterm exam. To compute the probability of receiving at least 10 emails on the next day before the midterm she would use which probability distribution?
If we were to repeat an experiment a large number of times and calculate a statistic such as the mean for each experiment, the distribution of these experiments would be called?
Question 1: At the PISA Web site (www.pisa.oecd.org), there are summary statistics for math scores of 15-year-old males and females for various countries separately. The mean math scores for males, the mean math scores for females, and also the di..
the number of yearly breakdowns for the power generator observed over the past 20 years at orlando utilities is
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