To get a sample of a certain size, scores are taken one-by-one from the observed data...
To get a sample of a certain size, scores are taken one-by-one from the observed data and each time replaced. The parameter of interest (e.g., the mean or b in regression) is computed within the sample. This process is repeated numerous times. The resulting parameter estimates are used to compute a confidence interval. The process I am describing is:
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a. Sampling |
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| b. The standard error | ||
| c. Significance testing | ||
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d. Bootstrapping |
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Homework Answers
Bootstrapping
In the process of bootstrapping, n-number of samples are created using the population data and the parameter of interest is calculated for each sample. The these parameter of interests calculated for each sample is further used for calculating the confidence interval.
Option D
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To get a sample of a certain size, scores are taken one-by-one
from the observed data...
A sample of size n=50 is taken from the production of lightbulbs at a certain factory....
A sample of size n=50 is taken from the production of lightbulbs at a certain factory. The sample mean of the lifetime of these 50 lightbulbs is found to be to X=1570 hours. Assume that the population standard deviation is a = 120 hours. (a) Construct a 95% confidence interval for . (b) What sample size is needed so that the length of the interval is 30 hours with 95% confidence?
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