According to a Field Poll, 79% of California adults (actual results are 400 out of 506 surveyed) feel that "education and our schools" is one of the top issues facing California. We wish to construct a 90% confidence int ...
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A probability experiment consists of rolling a 6-sided die. What is the probability of rolling a number less than 6.
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Two companies make instruments for bands. Company A's product has a lifespan of 5 years and a standard deviation of 15 months. Compny B's product has a mean lifespan of 5 years and a standard deviation of 3 months. Which ...
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Question: In the example of the diamond in the cave, what would be efficient law if any one explorer had only a very small probability of finding the diamond? How would your answer change if the costs of exploration were ...
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A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally distributed with a mean of 6.8 minutes and a standard deviation of 0.37 minutes. How fast woul ...
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In a population of Ph.D students 50% have paid assistant ships. A random sample of n=200 students are chosen. What is the expected number of students who have paid assistant ships in this sample?
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A particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past studies of this tire, the standard deviation is known to be 8,000. A survey of owners of th ...
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Researchers randomly assigned 25 beginning students of Russian to begin speaking practice immediately and another 25 to delay speaking for 4 weeks. At the end of the semester both groups took a standard test of comprehen ...
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Calculating this answer for my Statistics class: A hockey team conceded 18 goals on average per season. What is the probability that the team concedes 10 goals? This was my answer and it was incorrect, so I want to know ...
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The STAT 200 course coordinator wants to estimate the proportion of all online STAT 200 students who attend Penn State Learning tutoring sessions. In a survey of 72 students during the Summer 2018 semester, 8 had attende ...
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