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In a study investigating the effect of car speed on accident severity, 5,000 reports of fatal automobile accidents were examined, and the vehicle speed at impact was recorded for each one. For these 5,000 accidents, the average speed was 43 mph and the standard deviation was 12 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal. (Use the Empirical Rule.) (Round your answer to the nearest whole number.)
(a) What percentage of vehicle speeds were between 31 and 55 mph?
(b) What percentage of vehicle speeds exceeded 55 mph?
the cost of a one-carat vs2 clarity h color diamond from diamond source use is 5600. a midwestern jeweler makes calls
What is the difference between failing to reject the null hypothesis and having evidence to support the alternative hypothesis- Provides relevant application
Find the z-score for each score in the population. Transfer the original population into a new population of N=5 scores with a mean of μ=60 and a standard deviation of σ=8
At the 0.05 level, is the 40% rate significantly greater than the 35% that had been occurring in the past, or might this higher rate be simply due to chance variation? Identify and interpret the p-value for the test.
q1. consider the following stem and leaf plotstemnbspnbspnbspnbspnbspnbsp leaf1 nbsp nbsp nbsp nbsp 0 2 5 72 nbsp nbsp
What would the average sales have to be in order to justify a statement that business had improved, at the 5 % significance level?
The random variable is transformed by the device whose input-output relationship is shown.- Find and sketch the PDF of the transformed random variable, Y.
Define descriptive statistic and inferential statistic. Explain each of the statistic and give example. 2. With your own word, what do you understand the function of statistic?
Biorthogonal signals are preferred in some applications over orthogonal signals, explain why? And give some applications for each one?
Gold's managers are considering a promotion in which they reward frequent users with a small gift. They have decided that they will only give gifts.
Construct a scatter plot of the unemployment rate versus inflation rate for the period 2000 through 2005. Describe the relationship that appears to exist.
A certain class has 20 students, and meets on Mondays and Wednesdays in a classroom with exactly 20 seats. In a certain week, everyone in the class attends.
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