Question

Use another random decimal fraction generator at Random.org, linked here to generate a list of ten two-digit random numbers between 10 and 30. Calculate the z-score of the median of the data set. (12, 15, 17, 18, 19, 21, 23, 24, 25, 28) σ: 4.6647615158762 Mean: 20.2 Median: 20 Z-score: -0.043

1. What does the z-score of the data set median just above tell you about the shape of the distribution? How do you know this?

2. If you were to take repeated random samples of n = 5 from the data set just above, what would be the expected value of the mean of the sampling distribution of sample means?

3. Considering the set of ten two-digit random numbers above as a population, calculate the standard error of the mean for the samples in question 4.

Answer #1

1. What does the z-score (-0.0566) of the data set (12, 14, 17,
19, 20, 21, 24, 25, 26, 30) median (20.5) just above tell you about
the shape of the distribution? How do you know this? Expert Answer
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2. If you were to take repeated random samples of n = 5 from the
data set just above, what would be...

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Use Random number generator (under Data Analysis) to simulate
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the following data set. Create 10 columns, each 20 points long and
use the following parameters: Number of variables (10), number of
data point (20), Distribution (Normal), Mean (40), Standard
Deviation (10), Random seed (1234). The data should be in columns:
A,B,C,….,I,J. Randomly pick two columns (say Column B and Column H)
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