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 3.7 and a standard An IQ test is designed so that the mean is 100 and the standard deviation is 18 for the population of normal adults. Find the sample size necessary to deviation of 15.6. Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the estimate the mean IQ score of statistics students such that it can be said with 99% confidence that the sample mean is within 8 IQ points of the true mean. confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? Assume that o = 18 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation. Click here to view a t distribution table Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. The required sample size is . (Round up to the nearest integer.) What is the confidence interval estimate of the population mean ? Screen Shot 2021-... > > mg/dL > Q 5 Listed below are student evaluation ratings of courses, where a rating of 5 is for "excellent." The ratings were obtained at one university in a state. Construct a confidence interval using a 99% confidence level. What does the confidence interval tell about the population of all college students in the state? 3.5, 3.1, 3.7, 4.9, 2.9, 3.9, 3.4, 4.7, 4.4, 4.0, 4.3, 4.0, 3.2, 4.3, 3.5 - Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many grade-point averages must be obtained so that the sample mean is within 0.013 of the population mean? Assume that a 98% confidence level is desired. If using the range rule of thumb, o can be estimated What is the confidence interval for the population mean ? as range _ 4-0 4 = 1. Does the sample size seem practical? [