Chapter Eight Work: p. 250: 8.5; 8.7; p. 257: 8.19; 8.20; p. 260: 8.28; p. 265: 8.43; pp. 265 – 266: 8.48 (see pdf attached)
Please include as much of the process, work/formulas, etc., as possible
Which of the following statements are correct concerning a 95% confident interval?
a) There is a 0.05 probability the population parameter of interest is not contained within the interval.
b) There is a 0.95 probability that the population parameter of interest is contained within the interval.
c) In from 20 samples, 19 of the intervals would contain the population mean.
d) If you were to produce all possible confidence intervals using the sample mean of each sample of a given size from the population, then 95% of the intervals would contain the population mean.
A confidence interval was used to estimate the proportion of government employees who are part of HR. A random sample of 72 employees generated the following 90% confidence interval: (0.438, 0.642). What would be necessary if we wanted to estimate the true proportion to within 0.08 using 95% confidence?
The to know the GG levels of incomes with the protection division. The is known to be $1000. A random sample of 50 individuals resulted in a mean income of $15,000. What is the width of the 90% confidence interval?
In the construction of confidence intervals, if all other quantities are unchanged, an increase in the sample size will lead to what change in the interval?
c) less significant
Please submit online as an attachment. Please include the process and explain your choice for the multiple choice.
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