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A percentage distribution is obtained from a frequency distribution by replacing each frequency by 100 times the ratio of that frequency to the total frequency. Construct a percentage distribution using the reactiontime data of Exercise 116.
Exercise 116:
Eighty pilots were tested in a flight simulator and the time for each to take corrective action for a given emergency was measured in seconds, with the following results:
Construct a frequency distribution of these data.
Test, at the 5% significance level, whether the average cost-to-income ratio amongst all JSE companies adheres to the rule of thumb. Formulate the null and alternative hypothesis and interpret the findings.
How to convert a exam score (standard score) back to Percent score? e.g. Total of students 16,
What is a hypothesis test? Why do we need to use them to make decisions about relating sample results to the population; why can't we just make our decisions by the sample value?
as the number of degrees of freedom for a t distribution increases the difference between the t distribution and the
The time (in hours) until failure of a transistor is a random variable X which is exponentially distributed with mean = 50. It is observed that after 40 hours the transistor is still working. Find the conditional probability that X > 65.
Provide a complete and straight forward response to the following: Biotechnology has impacted our lives in many ways. Explain three ways this type of technology has affected the field of medicine and the decisions society makes about their own heal..
a study of drinking and driving has found that 40 of all fatal auto accidents are attributed to drunk drivers 2 of all
imagine that there are 100 different researchers each studying the sleeping habits of college freshmen. each researcher
In your environment (business or personal), please give an application of exponential smoothing and why you would use this technique.
Internet sites often vanish or move, so that references to them can't be followed. In fact, 13% of Internet sites referenced in papers in major scienti?c journals are lost within two years after publication.
Healthcare issues are receiving much attention in both academic and political arenas. Compute the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year.
1. What is the slope of this line? Say in words what the numerical value of the slope tells you. 2. What is the intercept? Explain why the value of the intercept is not statistically meaningful.
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