7 Liang haarh tran 12/10/17624 PM Test: Final 01:12:50 Submilt Test This Questio

Question

7 Liang haarh tran 12/10/17624 PM Test: Final 01:12:50 Submilt Test This Question: 1 pt 80f 9 (9 complete) This Test: 9 pts of garlic for lowering cholesterol, 45 subjects were treated with garlic in a 7 In a test of the e 4 below. 9 click and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have a mean of 4.1 and a standard deviation of 17.9. Complete parts (a) and (b) normal distribution table after the 5 The best point estimate is 4.1 mg/d s (Type an integer or a decimal.) the effectiveness of garlic in reducing LDL cholesterol? What is the confidence interval estimate of the population mean ? (Round to two decimal places as needed.) 10

Explanation / Answer

solution:-

a.the best point estim ate of the population mean net change in LDL cholesterol after the garlic treatment
= 4.1 mg/dl
b.given that 90% confidence interval is 1.645
ME = 1.645*17.9/sqrt(45) = 4.39

so the confidence is
90% = 4.1-4.39 < u < 4.1+4.39
  
= -0.29 < u < 8.49

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