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By law, all new cars must be equipped with both driver-side and passenger-side safety air bags. There is concern, however, over whether air bags pose a danger for children sitting on the passenger side. In a National Highway Traffic Safety Administration (NHTSA) study of 55 people killed by the explosive force of air bags, 35 were children seated on the front-passenger side. (Wall Street Journal, January 22, 1997.) This study led some car owners with children to disconnect the passenger-side air bag.
a) Use the study to estimate the risk of an air bag fatality on a child seated on the front passenger seat.
b) NHTSA investigators determined that 24 of 35 children killed by the air bags were not wearing seat belts or were improperly restrained. How does this information affect your assessment of the risk of an air bag fatality?
Compute the range and interquartile range
Dividend is expected to grow 7% a year for next 3 years and then at 5% a year after that. Determine the expected dividend per share for each of the next five years?
Compute standard error of mean? Compute the margin of error, with 95% confidence.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Test the hypothesis that no difference exists between the groups at α = .05 and perform and report all related tests and statistics.
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
What is the probability that a cereal would be high calorie, given that is low fiber? In other words, what is P (high calorie, given low fiber)?
Test hypothesis that annual incomes of corporate trainers in areas of more than 500,000 are considerably more than those in areas of less than 100,000. Make use of the 5% level of risk.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
If a complete failure occurs, calculate the probability that the fault occurred in:
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
Find probability using normal distribution.Using N (1152, 84), the Normal model for weight of Angus steers, what percent of steers weigh.
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