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The standard deviation for a population is σ=14.5. A sample of 25 observations selected from this population gave a mean equal to 140.30. The population is known to have a normal distribution.
Round your answers to two decimal places.
a. Make a 99% confidence interval for μ( , )
b. Construct a 97% confidence interval for μ( , )
c. Determine a 95% confidence interval for μ( , )
d. Does the width of the confidence intervals constructed in parts a through c decrease as the confidence level decreases?
Yes
No
For the variable you identify another graphical display that might be useful and construct it. What conclusions can you reach from this other plot that cannot be made from the boxplot?
Two components of reliability 0.95 are in parallel and this subsystem is connected in series to a component with a reliability of 0.90. Calculate the overall reliability of this system.
The steps to perform that is to first compute the z-score in the original scale, and then transform it using the formula transform Standard Score.
Should the finite-population correction factor be used? Why or why not?
The number of hours a light bulb burns before failing varies from bulb to bulb. The distribution of burnout times is strongly skewed to the right. The central limit theorem says that
Seasonal adjustment. Like many government data series, the CPI is published in both unadjusted and seasonally adjusted forms.
(a) Identify the null hypothesis and alternative hypothesis. (b) Determine the test statistic. (c) Determine the P-value for this test. (d) Is there sufficient evidence to support the researcher's claim? Explain.
Describe the difference between a policy and a law and provide an example of each.
Find the middle 80% range (i.e. range that is symmetrical about the mean) for the age of its subscribers.rs. What proportion of Mogul's newsstand customers have ages in the range computed above?
professor fair believes extra time does not improve grades on exams. he randomly divided a group of 300 students into
Cool car colors The most popular colors for cars and light trucks change over time. Silver passed green in 2000 to become the most popular color worldwide.
Using the Data|Table command, tabulate the probability of acceptance for defective percentage ranging from 0% to 15% in steps of 1%.
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