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Ten specimens of raw material treated with new chemicals have shown the modulus of elasticity in kg/cm as follows:
30.0 ,32.0 ,33.5, 31.5, 34.5, 32.5 ,32.3 ,33.3, 31.6, 32.7
Before treating with chemicals, the variance of the modulus of elasticity has been equal to 2.5.it is believed that the new chemicals have produced more elasticity material and the standard deviation has increased. Test whether it is so or not?
Among 12 adults randomly selected from this area, only 3 reported that their health was excellent. Find the probability that when 12 adults are randomly selected, 3 or fewer are in excellent health.
There is enough evidence to support the claim that the average speed of all vehicles on that stretch of I-10 is greater than the 70 mph speed limit.
At the 0.05 significance level, can we conclude that equal numbers of Canadian retirees living in Hawaii came from each of the four cities?
Find a 95% confidence interval for the difference in the mean reduction in blood sugar levels between diet types 2 and 4. Is there a difference between the two diet types?
assume a flipping a coin has a 50 - 50 chance of heads or tails. you flip a coin until the first time it comes up
Conduct the appropriate hypothesis test to determine whether the proportion of people who experience relief due to the antihistamine is different from the proportion of people who experience relief from butterbur extract. Use a = 0.01.
Can we develop statistical methods without using probability theory? Apply the methods without using a sample?
Discuss, in relative terms, the sample size needed for an application of a normal distribution for the sample mean when sampling is from each of the following.
(a) What is the probability that the amount of collagen is greater than 69 grams per mililiter?
A national survey of restaurant employees found that 75% said work stress had a negative impact on their personal lives. A sample of 100 employees from a popular restaurant chain finds that 68 answer
What is the probability that the sample proportion is between 0.11 and 0.15?
How does this illustrate the concepts behind Type I and Type II errors?
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