Mathematics, 05.05.2020 06:28 luisannavasquez6129
If the quality of teaching is similar in a school, the scores on a standardized test will have a standard deviation of 12. The superintendent wants to know if there is a disparity in teaching quality, and decides to investigate whether the standard deviation of test scores has changed. She samples 25 random students and finds a mean score of 156 with a standard deviation of 5.4822. Is there evidence that the standard deviation of test scores has decreased at the α=0.1 level? Assume the population is normally distributed.
Answers: 2
Mathematics, 21.06.2019 15:40
He amount of carbon-14 present in animal bones t years after the animal's death is given by p(t)equals=upper p 0 e superscript negative 0.00012097 tp0e−0.00012097t. how old is an ivory tusk that has lost 26% of its carbon-14?
Answers: 1
Mathematics, 21.06.2019 18:30
The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?
Answers: 3
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