Periodically, the county Water Department tests the drinking water of homeowners for contaminants such as lead and copper. The lead and copper levels in water specimens collected in 1998 for a sample of 10 residents of a subdevelopment of the county are shown below.| Lead (µg/L) | Copper (mg/L) ||-------------|--------------|| 2.9 | 0.133 || 0.2 | 0.774 || 5.1 | 0.214 || 4.2 | 0.671 || 5.5 | 0.444 || 1.2 | 0.234 || 0.3 | 0.357 || 1.3 | 0.761 || 4.9 | 0.176 || 1.7 | 0.888 |(a) Construct a 99% confidence interval for the mean lead level in water specimens of the subdevelopment.\[ \boxed{\ \ \ } \leq \mu \leq \boxed{\ \ \ } \](b) Construct a 99% confidence interval for the mean copper level in water specimens of the subdevelopment.\[ \boxed{\ \ \ } \leq \mu \leq \boxed{\ \ \ } \]

We have found that the lead and copper levels in water specimens collected in 1986 for a sample of…

Answered: Periodically, the county Water…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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110 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency Relative Frequency Cumulative Frequency 0 18 0.1636 18 1 9 0.0818 27 2 12 0.1091 39 3 13 0.1182 52 4 17 0.1545 69 5 12 0.1091 81 6 16 0.1455 7 110 a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 1 time per week? %
The National Institute of Standard and Technology provided exact data on conductivity properties of materials. Following are conductivity measurements for 11 randomly selected pieces of a particular type of glass. Click this button to reveal the data Conductivtity 1.11 1.07 1.11 1.07 1.12 1.08 0.98 0.98 1.02 0.95 0.95 Download CSV file Download the .csv file or copy/paste the data into Excel. After downloading .csv file, you may want to save it as a Excel Workbook. Based on these data, is there evidence that the median conductivity of this type of glass is greater than 1? Use a 10% level of significance level. a. How many samples of data are there in this study? b. What test you would use for this problem? Select an answer c. The null hypothesis of this test states that Select an answer d. What type of test is this? O One-side Two-side
Listed below are body temperatures from five different subjects measured at 8 AM and again at 12 AM. Find the values of d and sd. In general, what does μd represent? Temperature (°F) at 8 AM 97.6 99.4 97.3 97.1 97.9 Temperature (°F) at 12 AM 98.2 99.9 97.6 96.7 98.3
A blood pressure measurement consists of two numbers: the systolic pressure, which is the maximum pressure taken when the heart is contracting, and the diastolic pressure, which is the minimum pressure taken at the beginning of the heartbeat. Blood pressures were measured, in millimeters of mercury (mmHg), for a sample of 14 adults. The following table presents the results. Assume that blood pressures follow a bivariate nomal distrībution. Systolic Diastolic 134 87 115 83 113 77 123 77 119 69 118 88 130 76 70 91 116 133 112 75 107 71 110 74 108 69 105 66 Find a 95% confidence interval for p, the correlation between systolic and diastolic blood pressure. b. Can you conclude that p> 0.5? C. Can you conclude that p> 0?
70 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency Relative Frequency Cumulative Frequency 0 5 0.0714 5 1 11 0.1571 16 2 11 0.1571 27 3 7 0.1 34 4 7 0.1 41 5 7 0.1 48 6 8 0.1143 7 70 a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 2 times per week? %
The following relative frequency histogram presents the weights (in lb) of a sample of visitors to a health clinic. What percent of visitors to the health clinic weighed less than 150 lb?
construct a 90% condifence interval for the population mean of total calcium in this patient blood
110 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency Relative Frequency Cumulative Frequency 0 14 0.1273 14 1 15 0.1364 29 2 9 38 3 14 0.1273 4 11 0.1 63 5 17 0.1545 80 6 0.1091 92 7 18 0.1636 110 a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 6 times per week? %
b?
Please help me in answering the following practice question:Given a random sample of the amount of protein (in gram) in one bag of snack food: 0.95, 0.85, 0.92, 0.95, 0.93, 0.86, 1, 0.92, 0.85, 0.81, 0.78, 0.93, 0.93, 1.05, 0.93, 1.06, 1.06, 0.96, 0.81, 0.96 Here, it is assumed that the amount of protein in the snack is normal. How would I calculate a 98% two-sided confidence interval for the average amount of protein in one bag?Thank you for your help in advance!
130 adults with gum disease were asked the number of times per week they used to floss before their diagnoses. The (incomplete) results are shown below: # of times floss per week Frequency Relative Frequency Cumulative Frequency 18 0.1385 18 1 21 0.1615 39 2 20 59 3 15 0.1154 4 16 0.1231 90 10 0.0769 100 6 0.1231 116 7 14 0.1077 130 a. Complete the table (Use 4 decimal places when applicable) b. What is the cumulative relative frequency for flossing 5 times per week?
Refer to the table to the right summarizing measured amounts of serum cotinine (ng/mL) from a sample of smokers. When nicotine is absorbed by the body, cotinine is produced. How many subjects are included in the summary? Is it possible to identify the exact values of all of the original cotinine measurements? Cotinine (ng/mL) 0-99 100-199 200-299 300-399 400-499 How many subjects are included in the summary? (Type a whole number.) Is it possible to identify the exact values of all of the original cotinine measurements? Frequency 10 14 15 3 2 OA. Yes. The exact data values are equally spaced numbers between the limits of each class. The number of equally spaced numbers is determined by the frequency in each class. OB. No. A frequency table only shows percentages of the sample in each category. OC. No. A frequency table only shows frequencies of data values in each category. OD. Yes. The data values are the frequencies shown in the table.

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