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The probability is 1 in 4,000,000 that a single auto trip in the United States will result in a fatality. Over a lifetime, an average U.S. driver takes 50,000 trips. (a) What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated? (b) Why might a driver be tempted not to use a seat belt "just on this trip"?
Each scenario involves randomly selecting n i observations from four, independent, Normal populations as described.
Which of the following methods could be used to determine future order quantities? forecasting, regression, inventory models.
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
SAT verbal scores are normally distributed with a mean of 423 and a standard deviation of 91. Use the Empirical Rule to determine what percent of the scores lies between 423 and 514.
A geologist you spoke with is concerned about the rate of land erosion around the base of a dam. Another geologist is studying the magma activity within the earth in an area of New Zealand known for its volcanic activity.
What is the smallest level of significance at which you could reject the null in favor of the alternative hypothesis?
An educational study utilizes a simple pre post design to assess the efficacy of a computer tutor for solving inequalities.
Suppose the population standard deviation is a=25. (The a is actually the funny looking 0 with the line that goes from the top right up at an angle) Compute the standard error of the mean
For the variable you identify another graphical display that might be useful and construct it. What conclusions can you reach from this other plot that cannot be made from the boxplot?
Give a possible description why serum cholesterol values for older males are lower than for younger males and reverse is true for females.
If writing scores for population have standard deviation of s = 20, does sample give sufficient evidence to conclude that new composition course has significant effect? Suppose a two tailed test with a = 0.05.
The researchers found that subjects who answered immediately made the best decisions and that "the longer our participants thought about their answers, the more likely they were to include irrelevant information at the expense of relevant informat..
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