The average metal concentration recovered from a sample of metallic measurements in 36 sites is found to be 2.6 grams per millilitre. Find the 95 % confidence intervals for the mean metallic concentration in the river. The population standard deviation is 0.4

The average metal concentration recovered from a sample of metallic measurements in 36 sites is found to be 2.6 grams per millilitre. Find the 95 % confidence intervals for the mean metallic concentration in the river. The population standard deviation is 0.4

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Quantitative Methods 1 QUESTION 5a - problem-type question requiring detailed written answers. A machine packages sugar in bags which have a mean weight of 250grams and standard deviation of 5 grams. The machine was recently serviced and it is believed that the mean weight of the bags has changed but the standard deviation has remained the same. A random sample of 45 bags gave a mean of 248.4 grams. Test at a 2% level of significance whether the mean weight of the bags is different from 250 grams. i) State the null and alternative hypotheses for this test. ii) Find the p-value for the test of hypothesis. iii) Will the null hypothesis be rejected at a 2% significance level?
X zy Section 5.4 - QNT/275T: Statistics X /chapter/5/section/4 ision Making home > tween two population means ypothesis test for the difference between two population means. Jump to level 1 The mean voltage and standard deviation of 12 batteries from each manufacturer were measured. The results are summarized in the following table. Sample mean Manufacturer voltage (millivolts) CHA B Check + 106 101 What is the test statistic? Ex: 0.123 Next What type of hypothesis test should be performed? Select Select Left-tailed z-test Paired t-test What is the number of degrees of freedom? Ex: 25 Two-tailed z-test Unpaired t-test Population standard deviation(millivolts) 3 Does sufficient evidence exist to support the claim that the voltage of the batteries made by the two manufacturers is different at the a = 0.05 significance level? [Select v 2 5
nd Tap - Cengage Learhing om/static/nb/ui/evo/index.html?deploymentld%3D59965217903652740813033898&elSBN=9780357131596&id%3D11381315... 田) E MINDTAP Q Search this cour nent: Assignment 17 Assignment Score: 0.00% Save Submit Assignment for Grading as Exercise 08.15 (Population Mean: Sigma Unknown) Question 1 of 2 » Hint(s) Check My Work Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 65 weekly reports showed a sample mean of 19.5 customer contacts per week. The sample standard deviațtion was 5.2, Provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts for the sales personnel. 90% confidence interval, to 2 decimals: 18.48 20.56 95% confidence interval, to 2 decimals: ( 18.28 20.72 Hide Feedback Incorrect Hint(s) Check My Work 0- Icon Key zeAssignmentMain.do?takeAssignmentSessionLocator=assignment-take,2aaeebee-c084-4f48-b59b-9208e2304be0# Question 1 of 2 »
The difference between the means for the following items are statistically significant. For which one is the significance at a higher level? Explain your answer.a.The difference for hugging each other.b. The difference for holding hands.
Aspirin III: Decision and Conclusion Regarding the experiment in the data frame Aspirin from the abd package, the researchers wanted to know whether or not taking aspirin affects one's risk of developing cancer. Recall that they defined their parameters as follows: p1 = the proportion of ALL individuals who would develop cancer, if all of them were to take aspirin like the subjects in the Aspirin group did. p2 = the proportion of ALL individuals who would develop cancer, if all of them were to take a placebo, like the subjects in the placebo group did. They ran the code for a two-sided significance test and got the following results: ## ## ## Inferential Procedures for the Difference of Two Proportions p1-p2:## cancer grouped by treatment ## ## ## Descriptive Results:## ## yes n estimated.prop## Aspirin 1438 19934 0.07214## Placebo 1427 19942 0.07156## ## ## Inferential Results:## ## Estimate of p1-p2: 0.0005805 ## SE(p1.hat - p2.hat): 0.002586 ## ##…
To determine if their 1.50 centimeter bolts are properly adjusted, Norman & Mayer Manufacturing has decided to use an X-Chart which uses the range to estimate the variability in the sample. Table Control Chart Answer How to enter your answer (opens in r Step 1 of 7: What is the Center Line of the control chart? Round your answer to three decimal places. Period 1 2 3 4 5 6 Copy Table Tables Select the Copy Table button to copy all values. To select an entire row or column, either click on the row or column header or use the Shift and arrow keys. To find the average of the selected cells, select the Average Values button. ON obs1 obs2 1.45 1.52 1.55 1.51 1.51 1.50 1.50 1.53 1.46 1.53 1.52 1.54 1.51 1.50 1.50 1.52 1.46 1.47 1.52 1.53 1.53 1.54 1.53 1.53 1.53 1.53 1.54 1.48 1.54 1.49 1.53 1.50 7 1.46 1.46 1.54 1.48 1.49 1.51 8 1.47 1.48 1.51 1.51 1.53 1.50 9 1.50 1.54 1.54 1.53 1.53 1.49 10 1.54 1.49 1.55 1.51 1.51 1.50 Keypad Copy Table Average Values The average of the selected cell(s)…
Examus cdn.student.uae.examus.net/?rldbqn=1&sessi... Given the following sample data: 43, 50, 44, 49, 50 The value 362dcf917 Formulae Sheet STAT-101-1 X-X Conversion formula, z = Minimum "usual" value = E– 2s P(x) = n! %3D (n-x)lx! p* qn-x %3D Maximum "usual" value = i† 2s Ge362dcf917 Midrange = ī = Ex Σ-22 min value max value || S = %3D Variance =npq n-1 2. a. Mean Total Frequency E-ΣΧΡx) ; b. Range E= np %3D ce36Ydcf917 çe362dcf917 ce362 C. Midrange d. Median ce362dcf917 0% ce362dof917 MacBook Pro e362ucf917 PI L
1 A. Explain when the implementation of measurement uncertainty (error) uses descriptive statistical methods or the Gaussian method B B.Explain the importance or uncertainty of measurement (error)
Consider the function ƒ : R → R, with f(x) = eª cosx for all x € R. For any n € N, let Tn be the Taylor polynomial of f around 0, of order n. (a) Determine the polynomial T₂(x). (b) Use Taylor's approximation theorem to estimate how well T₂(0.1) approximates ƒ(0.1). (Any upper bound on |T₂(0.1) – ƒ(0.1)| is acceptable, as long as it follows from a correct application of Taylor's theorem and does not involve any unknowns.)
Directions: Determine the parameter to be tested in the given problems below. 1. An electric lamps manufacturer is testing a new method of producing lamps that will be considered acceptable in a normal population with an average life of 2,600 hours and a standard deviation equal to 350. A sample of 80 lamps produced by this method has an average life of 2,630 hours. Can the hypothesis of validity for the new manufacturing process be accepted with a risk equal to or less than 5%? 2. A car dealer claims that the average price of Honda Vios is at least ₱662,000.00. A client suspected that the claim is incorrect and found that random sample of 15 similar vehicles has the mean price of ₱640,000.00 and standard deviation of ₱ 24,000.00. Is there enough evidence to reject the dealer’s claim at ? = 0.05?