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The Rockwell hardness index for steel is determined by pressing a diamond point into the steel and measuring the depth of the penetration. Below are the Rockwell hardness indices for a random sample of 25 specimens of a particular type of steel. (Note: data values have been sorted below to help calculations)
46 51 54 56 56 57 59 59 60 60 65 65
66 67 68 69 69 70 71 72 73 74 74 76 79
The manufacturer claims that the "average" Rockwell hardness index for this type of steel exceeds 60. Determine if there is sufficient evidence to support the manufacturer's claim. (a = 0.01)
Derive a conservative one-sided upper 95% confidence interval for θ if x=4 is observed.
A paint manufacturer claims its paint will last an average of 16 years. Assume that paint life is normally distributed with a standard deviation of 3.2 years. Suppose a random sample of 20 houses are painted with this manufacturer's paint. What is..
Computing the mean and standard deviation for the given data - Find the value for the new standard deviation
Fruits, Glucose Data are available at a website on the weight of glucose in 84 different fruits. Make a histogram of the data, and describe that distribution.
What was the name of the pandemic which killed over 1% of the world's population in 1918?
a multiple choice quiz has 5 questions each with 5 answer choices. only one of the choices is correct. you have no idea
The conditions that make for happy people have been researched by psychologists for a long time. The data that follow are based on a review of the literature.
The probabilities that smoke detectors are functioning are randomly and independently distributed. What is the probability that exactly one smoke detector.
Refer to the previous two exercises. Draw a tree diagram to illustrate the probabilities in a situation where you ?rst identify the gender of the student and then identify the type of institution attended. Explain why the probabilities in this tre..
Success in college (1.1) The 2007 Freshman Survey asked first-year college students about their "habits of mind"-specific behaviors that college faculty.
What are the four major traditional investment asset classes? Based on typical examples of each class, rank-order the classes.
The manager of a supermarket would like the variance of the waiting time soft the customers not to exceed 3minutes squared.
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