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Question: Look, in the Sky The American Meteor Society maintains a running fireball-tracking system. All reports are analyzed and grouped according to several variables. In 2012, there were 2302 fireball reports, and 590 of these were confirmed by 2-5 witnesses. As of August 2013, there were 507 reports and 142 were confirmed by 2-5 witnesses.32 Assume the samples are independent. Is there any evidence to suggest that the proportion of fireball reports that are confirmed by 2-5 witnesses is different for these two time periods? Use a = 0.05.
The errors of 17 students follow. Analyze the errors with a Mann-Whitney U test and write a conclusion about the effects of noise on reading.
data obtained from a random sample of recent years of caribou and wolf population.caribou x 30 34 27 25 17 23 20wolf y
In a random sample of 400 items, 88 are defective. If the null hypothesis is that 20% of the items in the population are defective, what is the value of ZSTAT?
compare the means of the following sets of yield data from catalysts aampb. determine if we can state the mean yield of
One objective of this course is learning how to correctly interpret statistical measures.
1. Rabbits like to eat the cucumbers in Mimi's garden. There are 10 cucumbers in her garden which will be ready to harvest in about 10 days. Based on her experience, the probability of a cucumber being eaten by the rabbits before harvest is 0.30.
What is the probability that the average time spent per customer will be at least 3 minutes?
Find the estimated regression line, and complete the ANOVA table.- Conduct an F test for a significant regression. Find bounds on the p value for this test.
There are two boxes, Box A and Box B. Box A has 40 tags with the number 1, 50 tags with the number 10, and 10 tags with the number 100. Box B has 40 tags with the number 100, 50 tags with the number 10, and 10 tags with the number 1.
Suppose the bank decides to lower the cutoff score from 250 points to 200. Is that analogous to choosing a higher or lower value of for a hypothesis test? Explain.
Six industrial workers were chosen for a study of the effects of rest periods on production.- Perform an appropriate nonparametric statistical test on the results shown in the following table.
a if fx is the probability density function pdf of a continuous random variable xwhat two conditions must be satised ?b
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