
A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students statewide have a normal distribution with a mean of 503 and a standard deviation of 40. A local Junior High principal has decided to give an award to any student who scores...

you roll a die and play 40 times. what's the probability that you win at least $100

The lowest degree of correlation shown below is ____

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years. 1. Find the probability that a randomly selected TV will have a replacement time less than 5 years. 2. If you want to provide a warranty so that only 1% of the TV sets...

A clinical trial is conducted to compare an experimental medication to the placebo to reduce the symptoms of asthma. 200 participants are enrolled in the study and randomized to recieve either the experimental medication or placebo. The primary outcome is a selfreported reduction of symptoms....

a survey found that the american fanmily generates 17.2 pounds of glass garbage each year. assume the standard deviation of the distribution is 2.5pounds, what is the probability that the mean of a sample of 55 families is between 17 and 18 pounds.

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A manufacturer of bicycles monitors production at their main production facility. The mean number of units produced per day should be 92, and past experience has shown that the standard deviation is estimated to be 14 units produced per day. The process is monitored using a sample size of 20....

A report from the college dean indicates that for the previous semester, the grade distribution for the Department of Psychology included 135 A's, 158 B's, 140 C's, 94 D's, and 53 F's. Determine what kind of graph would be appropriate for showing this distribution and...

The fracture strength of tempered glass averages 14 (measured in thousands of pounds per square inch) and has standard deviation 2
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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?
 2. What are the steps espoused by Applied Statistics in Business and Economics for formal hypothesis testing? Why is the sequence important?