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

185 225 240 196 175 180 194 185 223

1. Assume the population standard deviation = 25. Give a 90% confidence interval for the total cholesterol level in children 2 to 6 years of age.

2. The acceptable level of total cholesterol in children age 2 to 6 is considered to be less than 170. Is there strong evidence that these participants were selected from a population with acceptable cholesterol levels? Use a 10% significance level.

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Given Data 185 225 240 196 175 180 194 185 223 1 ... View the full answer