A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from...
A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample. The target accuracy in the past has been 2.5 or less with a standard deviation of 1.15. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target accuracy? State the null and alternative hypotheses. A. H0:µ < 2.5, H1: µ ≠ 2.5 B. H0: µ ≥ 2.5, H1: µ < 2.5 C. H0: µ ≠ 2.5, H1: µ = 2.5 D. H0: µ ≤ 2.5, H1: µ > 2.5
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A lab technician is tested for her consistency by taking
multiple measurements of cholesterol levels from...
A lumber mill is tested for consistency by measuring the variance of board thickness. The target...
A lumber mill is tested for consistency by measuring the variance of board thickness. The target accuracy is a variance of 0.0035 square inches or less. If 28 measurements are made and their variance is 0.006 square inches, is there enough evidence to reject the claim that the standard deviation is within the limit at a = 0.01? No, since the x test valle 46.29 is less than the critical value 46.963. Yes, since the x test value 8.91 is...
A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels...
A new drug to treat high cholesterol is being tested by pharmaceutical company. The cholesterol levels for 21 patients were recorded before administering the drug and after. The 90% confidence interval for the true mean difference in total cholesterol levels (after - before) was (14.93, 45.35). Which of the following is the appropriate conclusion? 1) We are 90% confident that the average difference in cholesterol levels is positive, with the higher cholesterol levels being after the drug regimen. 2) We...
A pediatrician was surprised to find many of her young patients had blood cholesterol levels over...
A pediatrician was surprised to find many of her young patients had blood cholesterol levels over 5 mmol/L, indicating an increased risk of coronary artery disease. She took a random sample of 30 such patients to take part in a special nutritional program designed to lower blood cholesterol. Ten weeks after the program started, she measured the cholesterol levels of each of the 30 patients again. a. With the before and after program data for each of 30 patients on...
A food murer moting is now cereales part of a daily diellowers total blood cholesterol levels....
A food murer moting is now cereales part of a daily diellowers total blood cholesterol levels. The table shows the olood cholesterol levels in miligrams per deciliter of blood of seven patients before eating the coreland hoone year of singers as part of the disse toch oost the meanino Assume the samples are random and dependent and the population is nostrud. Al 0.05, can you conclude that we lowers total blood cholesterol level? Patient Total Blood Cholesterol forel 215 Total...
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with...
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.6 and a standard deviation of 1.83. Use a 0.01 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the...
Assume that a simple random sample has been selected from a normally distributed population and test...
Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Use either the traditional method or P-value method as indicated. Identify the null and alternative hypotheses, test statistic, critical value(s) or P-value (or range of P-values) as appropriate, and state the final conclusion that addresses the original claim. -------------------------------- QUESTION: Use a significance level of ΅ = 0.05 to test the claim that µ = 32.6. The sample data consist of...
The IQ scores for a random sample of subjects with mediu lead levels in their blood and another r...
18
The IQ scores for a random sample of subjects with mediu lead levels in their blood and another random sample of subjects with high lead levels in their blood are given below. Use a 0.05 significance Medium Lead Level Hich with medium lead levels have full Q scores with a higher median that the median full IQ score for subjects with high lead levels. Does lead level appear to affect full IQ scores? EEB Click the icon to view...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl,...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl, and a variance, o', of 521. Some researchers claim that the variance of cholesterol levels of adult males is less than 521. A sample of 15 adult males' blood tests had a mean of 222.5 mg/dL and a variance of 192. Is there enough evidence to conclude, at the 0.05 level of significance, that the variance of cholesterol levels of adult males is less...
#1: Food scientists and nutritionists at the Sale Mart Supermarket chain want to estimate the true...
#1: Food scientists and nutritionists at the Sale Mart Supermarket chain want to estimate the true mean cholesterol content in their house brand blocks of Colby Jack cheese. Industry standards indicate that the population standard deviation is 2.5 mg. Determine the minimum sample size necessary to estimate to within 0.5 mg of the true population mean and with 95% confidence. (a) 95 (b) 96 (c) 97 (d) 98 (e) None of these answers #2: Food scientists and nutritionists at...
A simple random sample of 53 adults is obtained from a normally distributed population, and each...
A simple random sample of 53 adults is obtained from a normally distributed population, and each person's red blood cell count (in cells per microliter) is measured. The sample mean is 5.28 and the sample standard deviation is 0.55. Use a 0.05 significance level and the given calculator display to test the claim that the sample is from a population with a mean less than 5.4 which is a value often used for the upper limit of the range of...
A pediatrician was surprised to find many of her young patients had blood cholesterol levels over 5 mmol/L, indicating an increased risk of coronary artery disease. She took a random sample of 30 such patients to take part in a special nutritional program designed to lower blood cholesterol. Ten weeks after the program started, she measured the cholesterol levels of each of the 30 patients again. a. With the before and after program data for each of 30 patients on...
A food murer moting is now cereales part of a daily diellowers total blood cholesterol levels. The table shows the olood cholesterol levels in miligrams per deciliter of blood of seven patients before eating the coreland hoone year of singers as part of the disse toch oost the meanino Assume the samples are random and dependent and the population is nostrud. Al 0.05, can you conclude that we lowers total blood cholesterol level? Patient Total Blood Cholesterol forel 215 Total...
18
The IQ scores for a random sample of subjects with mediu lead levels in their blood and another random sample of subjects with high lead levels in their blood are given below. Use a 0.05 significance Medium Lead Level Hich with medium lead levels have full Q scores with a higher median that the median full IQ score for subjects with high lead levels. Does lead level appear to affect full IQ scores? EEB Click the icon to view...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl, and a variance, o', of 521. Some researchers claim that the variance of cholesterol levels of adult males is less than 521. A sample of 15 adult males' blood tests had a mean of 222.5 mg/dL and a variance of 192. Is there enough evidence to conclude, at the 0.05 level of significance, that the variance of cholesterol levels of adult males is less...
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