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- 5. Ten analyses of the concentration of albumin gave a mean of 20.92 g/1 and a standard deviation of 0.45 g/l, Calculate the 95% confidence interval of the mean. (a) 20.92 + 0.07 (b) 20.92 +0.15 (c) 20.92 + 0.64 (d) 20.92 + 0.32 6. How many grams of Pbl, will dissolve in 0.500 L of 0.0634 M Nal? (a) 4.08 x 10-4 (b) 6.58 x 10-5 (c) 7.54 x 10- (d) 2.96 x 10-3 7. Calculate the ionic strength of 0.060 M FeCla. (a) 0.98 (b) 0.36 (c) 0.75 (d) 1.38 8. 50.00 mL of 0.100 M NaCI solution is titrated with 0.100 M AGNO,. Calculate the chloride ion concentration after the addition of 60.00 mL of AgNO,. (a) 2.36 x 10-0 (b) 1.10 x 10-8 (c) 4.50 x 10-10 (d) 5.88 x 10-8 9. Calculate the potential of the following electrochemical cell under the given conditions: Pt/TiO?+(0.20 M),Ti** (0.10 M), H*(0.0020 M)||SO,-(0.20 M), PbSO.(s)|Pb (a) 0.244 V (b) -0.244 V (c) -0.335 V (d) -0.133 VSuppose that a researcher, using data on class size (CS) and average test scores from 100 third-grade classes, estimates the OLS regression TestScore = 494.3800 + (-5.5290) x CS. R = 0.10. SER = 10.9 (19.3800) (2.4089) Construct a 95% confidence interval for B,. the regression slope coefficient. The 95% confidence interval for B. the regression slope coefficient, is ( ). (Round your responses to two decimal places.) The t-statistic for the two-sided test of the null hypothesis Ho: B, = 0 is |. (Round your response to four decimal places.) Note: Assume a normal distribution. The p-value for the two-sided test of the null hypothesis H: B =0 is (Round your response to four decimal places) Do you reject the null hypothesis at the 1% level? O A. No, because the p-value is greater than 0.01. O B. Yes, because the t-statistic is greater than 2.58. OC. Yes, because the p-value is less than 0.01. O D. Yes, because the t-statistic is less than 2.58. The p-value for the two-sided test of the null…Describe about the Confidence Interval for μD.
- How large of a sample is required for a to construct a 99% confidence interval around a mean with an error of less than 1.5. Assume the standard deviation is 42.From a research survey, it was found that a random sample of 22 high school graduates of an exclusive school has a mean NSAT score of 90 with a standard deviation of 16, while a random sample of 24 high school graduates of a public school showed a mean NSAT score of 85 with a standard deviation of 12. Is there a significant difference in the NSAT performance of these two groups of high school graduates? Use 5% level of significance. 1. What is the conclusion in problemA doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 4 points with 99% confidence assuming s=10.7 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required?
- A statistics teacher taught a large introductory statistics class, with 500 students having enrolled over many years. The mean score over all those students on the first midterm was u = 88 with standard deviation o = 10. One year, the teacher taught a %3D much smaller class of only 25 students. The teacher wanted to know if teaching a smaller class was more effective and students performed better. We can consider the small class as an SRS of the students who took the large class over the years. The average midterm score was = 78. The hypothesis should be: a. Ho: H = 78 vs. Ha: H = 88. %3D O b. Ho: µ = 88 vs. Ha: µ 78 %3D Ο d. Ho: μ-88 νs. Ha: μ >88. %3DA doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 2 points with 99% confidence assuming s=13.4 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required?We want to estimate the mean number of chocolate chips per cookie for a large national brand. How many cookies would have to be sampled to estimate the true mean number of chocolate chips per cookie, within 2 chocolate chips and the 98% confidence? Assume that s=11.2 chocolate chips, from a prior sample
- The following data represent the length of time, in days, to recovery for patients randomly treated with one of two medications to ciear up severe bladder infections. Find a 95% confidence interval for the difference u,-H, between in the mean recovery times for the two medications, assuming normal populations with equal variances. Medication 1 x, 13 s = 14 s =1.6 n, = 14 Medication 2 n211 X2= 16 Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table ofcritical values of the t-distribution The confidence interval isThe determination of copper in a sea water sample gave a mean value of 77.81 ug/L and a standard deviation s, of 1.74 µg/L. How many samples must be analyzed to obtain a relative standard deviation (RSD) of 1.7% in the results at the 95% confidence level? (t at the 95% confidence level = 1.96)7.2.14 Question Help 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 2.9 and a standard deviation of 16.7. 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 the effectiveness of garlic in reducing LDL cholesterol? 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. What is the confidence interval estimate of the population mean µ? mg/dL < µSEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th…StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C…StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage LearningElementary Statistics: Picturing the World (7th E…StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. FreemanMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th…StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C…StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage LearningElementary Statistics: Picturing the World (7th E…StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. Freeman