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A researcher has a report for an experiment with a sample size equal to 100, the resulting 95% prediction interval was too large. If the researcher wishes to run a more precise experiment that will result in a 95% prediction interval half the size of the earlier study, then the researcher will require what size of a sample?
The second plane's speed is also normally distributed with mean and standard deviation 500and 10,respectively. What is the probability that plane 2 did not catch up to plane one after two hours of flight?
For a normal distribution, find the z-score value that separate the middle 90% of the distribution from the 10% in the tails.
a contestant on a game show wins five dollars for each correct answer. the game is plated as follows the contestant is
1. in a statistical test of hypotheses we reject the null hypothesis at alpha ifa the p-value is smaller than alpha.b
The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience.
consider the following. give your answers correct to two decimal places.a find the standard score z such that the area
a psychologist has developed a new method designed to help people taking an exam. the method requires the person to
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
a restaurant owner claims the percentage of his customer distribution is monday 10 tuesday 12 wednesday 10 thursday 15
Predict the number of accidents per year (to the nearest whole number) for a person whose age is 45 and who works 42 hours per week.
Employee theft or poor inventory control and that employee theft and poor inventory control are equally likely? Use the .02 significance level.
A rectangular garden has dimensions of 25 feet by 19 feet . A gravel path of equal width is to be built around the garden. How wide can the path be if there is enough gravel for 672 square feet?
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