In a test of the effectiveness of garlic for lowering cholesterol,48 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes(beforeminus−after)in their levels of LDL cholesterol (in mg/dL) have a mean of 5.4and a standard deviation of 17.7.Construct a 90%confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol?
What is the confidence interval estimate of the population mean
muμ?
Degrees of freedom = n - 1 = 48 - 1 = 47
For 47 degrees of freedom and 90% confidence interval,
Critical t value = 1.678
Hence,
90% confidence interval will be:
(1.11, 9.69)
Since the confidence interval contains only positive values, it suggests that garlic is effective in reducing :D: cholesterol.
In a test of the effectiveness of garlic for lowering cholesterol,48 subjects were treated with garlic...
In a test of the effectiveness of garlic for lowering cholesterol, 42 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (beforeminus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 4.1 and a standard deviation of 15.4 . Construct a 95 % confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest...
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In a test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (before-after) in their levels of LDL cholesterol (in mg/dL) have a mean of 3.6 and a standard deviation of 17.9. Construct a 90% confidence interval estimate of the mean not change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness...
In a test of the effectiveness of garlic for lowering cholesterol, 45 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (before - after) in their levels of LDL cholesterol (in mg/dL) have a mean of 5.3 and a standard deviation of 19.7. Construct a 99% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about...
In a test of the effectiveness of garlic for lowering cholesterol, 42 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (before - after) in their levels of LDL cholesterol (in mg/dL) have a mean of 3.1 and a standard deviation of 18.6. Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about...
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