Scientists are working on a synthetic vaccine (antigen) for the parasitic roundworm. The success of the vaccine hinges on the characteristics of DNA in the peptide (protein) produced by the antigen. In the journal, Gene Therapy and Molecular Biology (June 2009), scientists tested alleles of antigen-produced protein for the level of the peptide. For a sample of 24 alleles, the mean peptide score was 1.83 and the standard deviation was .15. Use this information to construct a 95% confidence interval for the true mean peptide score in alleles of the antigen-produced protein.
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- Scientists are working on a synthetic vaccine (antigen) for the parasitic roundworm. The success of the vaccine hinges on the characteristics of DNA in peptide (protein) produced by the antigen. In the journal, Gene Therapy and Molecular Biology (June, 2009), scientists tested alleles of antigen-produced protein for level of peptide. For a sample of 24 alleles, the mean peptide score was 1.83 and the standard deviation was .15. Use this information to construct a 95% confidence interval for the true mean peptide score in alleles of the antigen-produced protein.The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample ofn=20 children diagnosed with the disorder and measures each child’s attention span before and after taking the drug. The data show an average increase of attention span of MD=4.8minutes with a variance of s2=125 for the sample of difference scores. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one-tailed test with α=.05. Compute the 80% confidence interval for the mean change in attention span for the population.In a test of the effectiveness of garlic for lowering cholesterol, 41 senior citizens were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes in their levels of LDL cholesterol (in mg/dL) have an average (mean) of 3.8. Identify the sample, the population, the sample statistic, and the population parameter in this study.
- The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 20 children diagnosed with the disorder and measures each child’s attention span before and after taking the drug. The data show an average increase of attention span of MD = 4.8 minutes with a variance of s2 = 125 for the sample of difference scores. a. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one tailed test with α = .05. b. Compute the 80% confidence interval for the mean change in attention span for the population.The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 20 children diagnosed with the disorder and measures each child’s attention span before and after taking the drug. The data show an average increase of attention span of MD = 4.8 minutes with a variance of s2 = 125 for the sample of difference scores. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one tailed test with α = .05. Compute the 80% confidence interval for the mean change in attention span for the populationThe stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 20 children diagnosed with the disorder and measures each child’s attention span before and after taking the drug. The data show an average increase of attention span of MD = 4.8 minutes with a variance of s2 = 125 for the sample of difference scores. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one- tailed test with α = .05. (use the 4-step procedure)
- A randomized controlled trial is run to evaluate the effectiveness of a new drug for Parkinson’s Disease. A total of 100 individuals with Parkinson’s are randomized to either the new drug or placebo (50 per group). The outcome was measured using the Unified Parkinson’s Disease Rating Scale (UPDRS). Both groups had similar baseline scores. At the end of the trial, the mean UPDRS score of those assigned to the new drug was 55.7 with a standard deviation of 8.4. The mean score of those assigned to the placebo was 64.5 with a standard deviation of 6.3 years. Is there a statistically significant decrease in scores with the new treatment? Apply the two sample z test at a 5% level of significance. I am trying to figue out if this can be done in EXCEL, please provide details . I have the data analysis tool packRitalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 20 children diagnosed with ADHD and measures each child’s attention span before and after taking the drug. The data show an average increase of attention span of MD = 4.8 minutes with a variance of s2 = 125 for the sample of difference scores. Is this result sufficient to conclude that Ritalin significantly improves attention span? Use a one-tailed test at .05. Compute the 80% confidence interval for the mean chance in attention span for the population.Arsenic is a compound that occurs naturally in very low concentrations. Arsenic blood concentrations in healthy individuals are Normally distributed with a mean of 3.2 mg/dl. Some areas of the United States have naturally elevated arsenic levels in the ground and water supplies. Researchers took a sample 20 water samples from a particular area and measured the arsenic levels in each of the 20 water samples. They want to determine if there is sufficient evidence to conclude that the arsenic level in that area is higher than 3.2 mg/dl. hypothesis test for one population mean (unknown population standard deviation) confidence interval estimate for one population mean (unknown population standard deviation) hypothesis test for population mean from paired differences confidence interval estimate for population mean from paired differences hypothesis test for difference in population means from two independent samples confidence interval estimate for difference in population means from two…
- The type of alloy used in manufacturing electric wire is important in reducing resistance. It has been suggested that the use of one type of alloy can reduce the wire resistance by more than 0.05 ohm. An experiment was conducted two types of wire, one with the alloy added and a second without the allow added. The mean resistances of 32 samples of each type of wire resulted in a mean resistance of the wire with alloy added being 0.136 ohm and the resistance of the wire without the allow added was 0.083 ohm. The standard deviation associated with this type of experiment is known to be 0.0045 ohm. a) Test the claim that resistance of electric wire can be reduced by more than 0.05 ohm by adding an alloy to the wire. Use a significance value of 0.05. b) Verify the conclusion in part a) with the p-value c) Verify the conclusion in part a) with the appropriate confidence interval Note that in this problem, populations variances are KNOWN. Samples are large enough (greater than 30) that no…Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of u = 8 parts per billion (ppb) is considered safe for agricultural use. A well in Los Banos is used to water cotton crops. This well is tested on a regular basis for arsenic. A random sample of 37 tests gave a sample mean of = 7.3ppb arsenic. It is known that o = 1.9 ppb for this type of data. Does this information indicate that the mean level of arsenic in this well is less than 8 ppb? Use the classical approach. Use a = 0.01 What is the Decision (step 5) for this problem? There is not sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los Banos well is less than 7.3 ppb. O There is sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los Banos well is less than 8.0 ppb. There is not sufficient evidence at the 0.01 level of significance to show the mean arsenic level in the Los Banos well is less than 8.0 ppb. O There is…An important measure in the study of contagious infectious diseases is the number of cases directly generated by one previous case. Ashley is an epidemiologist studying the spread of an infectious disease in her country. She claimed that the mean number of cases directly generated by one previous case is now greater than 2.6. A study of 18 randomly selected cases of the disease is conducted and finds the sample mean number of cases directly generated by one previous case to be 3.1 with a sample standard deviation of 1.1. Assume that the population of the number of cases directly generated by one previous case is approximately normally distributed. Complete the parts below to perform a hypothesis test to see if there is enough evidence, at the 0.05 level of significance, to support the claim that µ, the mean number of cases directly generated by one previous case, is greater than 2.6. (a) State the null hypothesis H, and the alternative hypothesis H, that you would use for the test. H:…