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Five measurements of the tar content of a certain kind of cigarette yielded 14.5, 14.2, 14.4, 14.3, and 14.6 mg/cigarette. Assuming that the data are a random sample from a normal population, use the four steps in the initial part of Section 1 to show that at the 0.05 level of significance the null hypothesis μ = 14.0 must be rejected in favor of the alternative μ 14.0.
when sample data actually occur in pairs an advantage of a paired t-test is that it tends to increase the power of a
Findout the consumption level separating the bottom 45% to the top 55%. The September energy consumption levels for single family homes are found to the normally distributed with a mean
Write such an equation in terms of the relevant variables above for the beginning of each of the years to obtain the five functional constraints for this problem.
at a publishing company the mean age of proofreaders is 36 years old and standard deviation is 4 years. assume the
Compute and compare the probabilities that the system fails when the probability that component C1 functions is improved to a value of 0.98 and when the probability that component C2 functions is improved to a value of 0.88. Which improvement incr..
a. What is the probability that one randomly selected student scores above 1100 on the GRE? b. Describe the sampling distribution of the sample mean for the 16 students.
Data shows the average GPA of students at a school is 2.9. The GPA of a random sample of 16 biology students is 3.1 (with sample standard deviation= 1.2)
1. A sample of 65 observations is selected from one population. The sample mean is 2.67 and the sample standard deviation is .75. A sample of 50 observations is selected from a second population
a study was conducted to measure the effectiveness of a hypnotism in reducing pain. the measurements are centimeters on
in a gallop poll of 1005 randomly selected americans in april 2006 482 responded yes to the question do you consider
Develop a regression model to fit the trend effects for the data. Use a linear model and then try a quadratic model and how well does either model fit the data?
a -0.947 correlation coefficient has been found between two variables after examining 43 pairs of observations. what
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