Mathematics, 21.04.2021 16:40 kenz2797
An environmental group conducted a study to determine whether crows in a certain region were ingesting
food containing unhealthy levels of lead. A biologist classified lead levels greater than 4.6 parts per million
(ppm) as unhealthy. The lead levels of a random sample of 23 crows in the region were measured and
recorded. The data are shown in the stemplot.
The mean lead level of the 23 crows in the sample was 4.90 ppm and the standard deviation was 1.12 ppm.
a) Is there convincing evidence (q=0.05) that the mean lead level of crows in this region is
greater than 4.6 parts per million? b) Constructing a 90% confidence interval for this problem yields the values (4.50, 5.30). Does your interval support or contradict your decision from your hypothesis test? Why?
Answers: 1
Mathematics, 21.06.2019 19:00
Write an introductory paragraph for this corrie ten boom and her family were faced with some difficult choices after hitler came to power. some family members paid the ultimate price. write a carefully thought-out paper of at least 200 words dealing with the following concepts: --how should a christian act when evil is in power? --what do you think it would be like to live in an occupied country? remember to proofread anything you write thoroughly.
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Mathematics, 21.06.2019 22:00
Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.
Answers: 1
An environmental group conducted a study to determine whether crows in a certain region were ingesti...
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