Required informationEnvironmental Protection Agency standards require that the amount of lead in drinking water be less than 15 ppb. Twelvesamples of water from a particular source have the following concentrations, in ppb.11.40012.40013.9008.60011.20010.50014.50017.10015.2009.8008.10015.900A hypothesis test will be performed to determine whether the water from this source meets the EPA standard.What is the P-value?

To determine the p-value for the hypothesis test, we need to perform a one-sample t-test. The null…

Answered: Required information Environmental…

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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Several methods of estimating the number of seeds in soil samples have been developed by ecologists. An article gave the accompanying data on the number of seeds detected by the direct method and by the stratified method for 27 soil specimens. Specimen Direct Stratified 1 21 7 2 34 38 3 0 7 4 60 58 5 20 54 6 61 61 7 40 27 8 7 7 9 14 7 10 94 100 11 1 0 12 67 58 13 78 67 14 21 54 Specimen Direct Stratified 15 34 27 16 0 0 17 38 38 18 18 14 19 94 94 20 1 14 21 40 47 22 21 21 23 0 0 24 7 14 25 14 40 26 18 14 27 40 78 Do the data provide sufficient evidence to conclude that the mean number of seeds detected differs for the two methods? Test the relevant hypotheses using ? = 0.05. (Use ?direct − ?stratified.) Find the test statistic. (Round your answer to two decimal places.) t = Find the df. (Round your answer down to the nearest whole number.) df = Use technology to find the P-value. (Round your answer to four…
What is one indication that there are paired samples in a data set? Choose the correct answer below. O A. Knowing the value that a subject has in one group gives one no information about the value in the second group. OB. Each observation in one group is coupled with one particular observation in the other group. OC. The researcher is comparing two populations. O D. The researcher is working with two distinct groups in the data set.
The EPA tests cars for city miles per gallon (mpg). For one model, a sample of 16 cars were tested for mpg, the results follow. 28 25.7 25.8 28 28.5 29.8 30.2 30.4 26.9 28.3 29.8 27.2 26.7 27.7 29.5 28 1) What is point estimate of the mean mpg?
Listed below are body temperatures from five different subjects measured at 8 AM and again at 12 AM. Find the values of d and sg. In general, what does, represent? Temperature (F) at 8AM 98.1 99.2 97.3 97.9 97.5 Temperature ("F) at 12 AM 98.5 99.6 97.4 97.6 97.8 Let the temperature at 8 AM be the first sample, and the temperature at 12 AM be the second sample. Find the values of d and s à-0.20 (Type an integer or a decimal. Do n decimal. Do not round.)
Refer to the sample of body temperatures (degrees Fahrenheit) in the table below. Given these temperatures, what issue can be addressed by conducting a statistical analysis of the data? Subject 2 3 4 5 1 97.0 98.5 97.6 97.7 98.7 8 AM 12 AM 97.6 97.8 98.0 98.4 98.4 Choose the correct answer below. OA. The data can be used to address the issue of whether there is a correlation between body temperatures at 8 AM and at 12 AM. OB. The data can be used to address the issue of whether there is a difference between average body temperature for males and for females. OC. The data can be used to address the issue of whether there is a correlation between average body temperature and a person's exposure to sunlight. OD. The data can be used to find the percentage of people whose body temperature increases with illness. DELL
In a study conducted in Italy, 10 patients with hypertriglyceridemia were placed on a low-fat, high-carbohydrate diet. Before the start of the diet, cholesterol and triglyceride measurements were recorded for each subject. Patient Cholesterol Level (mmol/l) Triglyceride level (mmol/l) 1 5.12 2.30 2 6.18 2.54 3 6.77 2.95 4 6.65 3.77 5 6.36 4.18 6 5.90 5.31 7 5.48 5.53 8 6.02 8.83 9 10.34 9.48 10 8.51 14.20 a. Construct a two-way scatter plot for these data. b. Use STATA to calculate Pearson’s Correlation Coefficient for these data. c. Test, α = 0.05, whether or not the population correlation, ρ, equals 0.
A certain virus affects 0.7% of the population. A test used to detect the virus in a person is positive 87% of the time if the person has the virus (true positive) and 14% of the time if the person does not have the virus (false positive). Fill out the remainder of the following table and use it to answer the two questions below based on a total sample of 100,000 people. Virus No Virus TotalPositive Test Negative Test Total 100,000a) Find the probability that a person has the virus given that they have tested positive. Round your answer to the nearest hundredth of a percent and do not include a percent sign. % b) Find the probability that a person does not have the virus given that they test negative. Round your answer to the nearest hundredth of a percent and do not include a percent sign. %
Suppose that many large samples are taken from a population, and the sample proportions center around 0.78. Which of the following is most likely to be the population parameter? OA. 0.58 B. 0.78 O C. 0.48 D. 0.68
Check to see if there is a “glass ceiling”. Is a person’s career level dependent on their gender? a. Use the appropriate statistical test using the data below. Use the 0.05 alpha level. include the p-value and summarize your results. Career level/gender Entry level Manager level Director level Executive level Total Female 218 50 30 2 300 Male 290 60 40 10 400 b. Even if you do not get a significant result for part a of this problem, run a test to determine if the percentage of female executives is significantly less than the percentage of male executives. Use the 0.05 alpha level. include the p-value and summarize your results.
Several methods of estimating the number of seeds in soil samples have been developed by ecologists. An article gave the accompanying data on the number of seeds detected by the direct method and by the stratified method for 27 soil specimens. Specimen 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Direct 21 33 0 60 20 61 40 8 13 93 1 68 77 21 Stratified 8 37 8 57 53 61 28 8 8 100 0 57 68 53 Specimen 15 Find the test statistic. (Round your answer to two decimal places.) t = 16 17 18 19 20 21 22 23 24 25 26 27 Direct Find the df. (Round your answer down to the nearest whole number.) df = 33 0 37 17 93 1 40 21 0 8 13 Use technology to find the P-value. (Round your answer to four decimal places.) P-value = 17 40 Stratified 28 0 37 13 93 13 48 21 0 13 40 Do the data provide sufficient evidence to conclude that the mean number of seeds detected differs for the two methods? Test the relevant hypotheses using a = 0.05. (Use direct stratified.) 13 77
Solve the problem. Find the standardized test statistic t for a sample with n = 15, x = 8.7, s = 0.8, and a = 0.05 if Ho: Hs 8.4. Round your answer to three decimal places. a. 1.452 b. 1.631 c. 1.728 d. 1.312

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