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A company that dumps its industrial waste into a river has to meet certain restrictions. One particular constraint involves the minimum amount of dissolved oxygen that is needed to support aquatic life. A random sample of 10 specimens taken from a given location gives the following results of dissolved oxygen (in parts per million, ppm):
9.0 8.6 9.2 8.4 8.19.5 9.3 8.5 9.0 9.4
(a) Find a two-sided 95% confidence interval for the mean dissolved oxygen and interpret it.
(b) What assumptions do you need to make to answer part (a)?
(c) Suppose that the environmental standards stipulate a minimum of 9.5 ppm of average dissolved oxygen. Is the company violating the standard? Test at a level of significance α of 0.05.
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
Construct a frequency distribution table of the scores having approximately 10 class intervals and construct a cumulative percentage curve. Use your curve to determine the percentage of scores that fall below a value of 55.
In multiple regression, the relative size of the coefficients is not important. For example, your company may have a nationwide hiring program that focuses on hiring employees who have graduated from college in the past 3 years, and let's say you ..
1 create the regression equation that predicts an indivisuals political attitudes based on the number of times thhey
The mean noise level for 24 hospital operating rooms was 56.3 dBA and the standard deviation was 7.5 dBA. At α = .05 can it be concluded that there is a difference in means?
A major hurricane is a hurricane with wind speeds of 111 miles per hour or greater. During the 20th century, the mean number of major hurricanes to strike the U.S. mainland per year was about 0.7.
For ?xed B such that P(B) > 0, show that P(·|B) satis?es the axioms of probability.
a. Compute the mean and standard deviation for the time to complete calls to English-speaking service representatives. b. Compute the mean and standard deviation for the time to complete calls to Spanish-speaking service representatives.
Observations on Yare to be taken when X = 10, 20, 30, 40, and 50, respectively. The true regression function is E{Y) = 20 + l0X. The error terms are independent and normally distributed with
Calculate the least-squares regression line for these data using matrix operations.
Construct a 95 percent confidence interval for the true mean. (b) Why might normality be an issue here? (c) What sample size would be needed to obtain an error of ±10 square millimeters.
The foreman at a large plant estimates defective parts about 1.5% of the time. If the plant produces 25,000 parts in a week, what is the standard deviation (to the nearest tenth) for the number of defective parts?
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