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The manufacturer of a certain brand of light bulb claim that the variance of the lives of these bulb is 4200 square hours.a consumer agency took a random sample of 25 such bulb and tested them. the variance of he lives of these bulb was found to be 5200 square hours. assume that the lives of all such bulb (approximately) normally distribution.
a) make the 99% confidence intervals for the variance and standard deviation of the lives of all such bulbs.
b) test at the 5% significant level whether the variance of such bulbs is different from 4200 square hours.
A window is in the shape of a square of side s, witha semicircle of diameter s above it. Please help me unable to figure out how to write a function that express the total area of the window as a function of s
In a group of six professors selected at random, what is the expected number of extroverts? What is the standard deviation of the distribution?
An upper-level sociology class at a large urban university has 120 students, including 34 seniors, 57 juniors, 22 sophomores and 7 freshmen.
Find the probability that the amount of total claims over a period of 100 days is at least $150,000. (Use the fact that the sum of independent normally distributed random variables is normally distributed, with mean equal to the sum of the individ..
State the hypotheses for a chi-squared test in the context of this problem. Calculate the expected matrix and describe what it represents. Calculate the test statistic. Describe what this represents and answer the question posed.
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In a recent year, 11th grade New York public school students taking an English test produced test scores that were normally distributed with a mean of 81 and a standard deviation of 6. Let x be a random variable that represents a test score.
You are the quality control manager at Mars, Inc and you want to prove the company's claim that 10% of all M & M candies are blue. Is it possible to prove that claim using methods of hypothesis testing? Why or Why not?
In this table, my research is about the average amount of money people expect to spend on attomeys when they are injured. Is there a difference, depending on type of injury? Do people expect to spend more when the injury happened in a car, on job,..
Create a mixed integer programming model for this problem.
If 1.5 million X-Games were sold over the holidays, determine an interval for the number of defectives in sales. 12,184 to 32,816.
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