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Consider a random sample of size 40 from a normal population with hypothesized variance 75.6.
a. Write the four parts for a one-sided, left-tailed hypothesis test concerning the population variance with a = 0.001.
b. Suppose σ2 = 48.5. Find the value of the test statistic, and draw a conclusion about the population variance.
c. Find bounds on the p value associated with this hypothesis test.
Confidence intervals, again. Several factors are involved in the creation of a confidence interval. Among them are the sample size, the level of confidence, and the margin of error. Which statements are true?
Critically discuss the Central Limit Theorem? How large should the sample size be if the underlying distribution of the population values are:
How large should n be so that Chebyshev's inequality guarantees that the estimate is within 5 centimeters from h, with probability at least 0.99?
Does it fall into the confidence interval computed from the sample data? What does this tell you?
Determine the activation energy(ies) for each ceramic/reactor/precursor type. Comment on what causes the break in two of the curves at high temperatures.
In a clinical study of an allergy drug, 115 of the 204 subjects reported experiencing significant relief from their symptoms. At the 0.01 significance level, test the claim that more than half of all those using the drug experience relief.
What do we mean by confidence intervals - provide an example that illustrates your answer. Suppose we were to apply 95% and 99% confidence to your study results.. how might your result differ and why?
Create an accurate scatter plot of the data. This can be done by hand or using a program like Excel. Use Height as the x variable and Arm Span as the y variable. Does this graph show a linear relationship between x and y?
Reconsider the corn yield and rainfall data (Display 9.18; data file ex0915). Fit the regression of yield on rainfall, rainfall-squared, and year. Use the approach of Section 10.4.5 to find the rainfall that maximizes mean yield.
What criterion would be used for rejecting the null hypothesis? Assume that the standard deviation, σ, of the population is known.
in a poll 1003 adults in a country were asked whether they favor or oppose the use of federal tax dollars to fund
if the significance level .10 then what is the probability of rejecting ho when the null hypothesis is
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