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Determining sample size. Recall the previous exercise. Suppose you want to use a sample size such that about 95% of the averages fall within ±0.05 hours (±3 minutes) of the true mean μ = 7.02.
(a) Based on your answer to part (b) in Exercise 7.18, should the sample size be larger or smaller than 400? Explain.
(b) What standard deviation of the sample mean do you need such that 95% of all samples will have a mean within 0.05 hours of μ?
(c) Using the standard deviation calculated in part (b), determine the number of students you need to sample.
if the tail of a normal distribution contains exactly 2.5 of the scores then what is the z-score value that separates
If you want to construct a confidence interval to be used for testing the claim that graduate students have a mean IQ score that is greater than 100, and you want the test conducted with a significance level of 1%, what confidence level should be ..
Find the mean, median, mode, variance and standard deviation for the following data set:
One mole of methane in a piston-cylinder assembly undergoes an adiabatic compression from an initial state 1 P1 5 0.5 bar, v1 5 0.05 m3/mol 2 to a final state 1 P2 5 10 bar, v2 5 3 3 1023 m3/mol 2 . Use the van der Waals equation of state for noni..
Recurrence is defined as the reappearance of a metastasis in exactly the same site, or in the case of patients whose tumor never completely disappeared, enlargement of the original lesion. Times to recurrence (in weeks) for the 23 patients were: 2..
Mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be σ = 3.6 hours. Based on this information, what would be the point estimate for μ?
Let X be N( µ, 100). To test H0 : µ = 80 against H1 : µ > 80, let the critical region be defined by C = {(x1 , x2 , • • • , x25 ) : x > 83}, where x is the sample mean of a random sample of size n = 25 from this distribution.
Explain the decisions you made in the third cycle of the simulation. State the reasons for your decision and include an explanation of why you did not follow the recommendations of the stakeholders.
Calculate the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year. Identify the median age of the uninsured senior citizens
Given the data in the Excel file, Property Values, construct a multiple regression model with VALUE-2 YEARS as the dependent variable and the YEAR BUILT AND THE HOME SQUARE FOOTAGE as the independent variables.
a university with a high water bill is interested in estimating the mean amount of time that students spend in the
1 a sample of 100 flights for united airlines shows that 64 are on time. a sample of 100 flights for american shows
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