According to a recent survey, the population distribution of number of years for self-employed individuals in a certain region has a mean of 14.9 and a standard deviation of 4.5. a. Identify the random variable X whose distribution is described here. b. Find the mean and the standard deviation of the sampling distribution of x for a random sample of size 81. Interpret them. c. Repeat (b) for n = 324. Describe the effect of increasing n.
According to a recent survey, the population distribution of number of years for self-employed individuals in a certain region has a mean of 14.9 and a standard deviation of 4.5. a. Identify the random variable X whose distribution is described here. b. Find the mean and the standard deviation of the sampling distribution of x for a random sample of size 81. Interpret them. c. Repeat (b) for n = 324. Describe the effect of increasing n.
A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Transcribed Image Text:According to a recent survey, the population distribution of number of years of education
for self-employed individuals in a certain region has a mean of 14.9 and a standard deviation
of 4.5.
EP
a. Identify the random variable X whose distribution is described here.
b. Find the mean and the standard deviation of the sampling distribution of x for a random
sample of size 81. Interpret them.
c. Repeat (b) for n = 324. Describe the effect of increasing n.
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OA. The mean of all samples of size 81
B. The minimum mean for all samples of size 81
C. The expected value for the mean of a sample of size 81
OD. The maximum mean for all samples of size 81
The standard deviation is 0.5. (Type an integer or a decimal.)
Choose the correct description of the standard deviation.
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OA. The maximum deviation of the mean for a sample of size 81
OB. The minimum deviation of the mean for a sample of size 81
OC. The variablility of the mean for samples of size 81
OD. The standard deviation of all samples of size 81
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