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what is the 95 percent interval for the mean of 164
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An instructor wishes to determine if there is a relationship between the number of absences from his class and a student's final grade in the course. What is the predictor variable?
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2. Currently, when you check the fill volume for bottles of liquid pain killer, you take the cap off the bottle and pour the contents into a measuring device that can measure the volume within + .001 fl.oz. (in effect you destroy one bottle of product each time you do this). Since you get a big...
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I have Stat assignment I had attached
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A tire manufacturer claims that the lives of its tires are normally distributed and will last an average of 60,000 miles with a standard deviation of 3,000 miles. Sixty-four randomly selected tires were tested and the average miles were the tire failed were recorded. What is the probability that...
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1. Total cholesterol in children aged 10-15 is assumed to follow a normal distribution with a mean of 191 and a standard deviation of 22.4. a. What proportion of children 10-15 years of age have total cholesterol between 180 and 190? b. What proportion of children 10-15 years of age would...
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Question 3#: The average score on a particular exam is determined to be 84.35 with a standard deviation of 7.4. Assum the scores are normally distributed. Applicants with exam scores in the lower 10% are directed to special retraining. What is the minimum score required not to be directed to...
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given mu=55.00 and sigma equals 20.00, and there is 120 samples, how many of the 120 samples will obtain average scores between 47.00 and 51.00?
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In a shipment of 79 vials, only 17 do not have hairline cracks. If you randomly select 3 vials from the shipment, what is the probability that none of the 3 vials have hairline cracks?
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the average verbal sat score of all students is 540 and the population standard deviation is 30 sat points. what is the probability that a random sample of 36 students will have a mean verbal sat score that is great than 535?
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- 1. A school administrator wonders if students whose first language is not English score differently on the math portion of the sat exam than students whose first language is English. The mean SAT math score of students whose first language is english is 516 on the basis of data obtained from the college board. A simple random sample of 20 students whose first language is not English result in a sample mean SAT math score of 522. SAT math score are normally distributed with a population standard deviation of 114. Why is it necessary for SAT math scores to be normally distributed to test the hypothesis?
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