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A study is run to estimate the mean total cholesterol level in children 2-6 years of age. A sample of 9 participants is selected and

  • A study is run to estimate the mean total cholesterol level in children 2-6 years of age. A sample of 9 participants is selected and their total cholesterol levels are measured as follows.

185 225 240 196 175 180 194 147 223

  • Find the sample mean.

  • Find the sample standard deviation.

  • Find the standard error.

  • Find the margin of error for 90% confidence level.

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