A) COMPUTE THE TEST STATISTIC (ROUND TO THREE DECUMALS AS NEEDED)B) FIND THE CRITICAL VALUE(s) ROUND TO 3 DECIMAL PLACES AS NEEDEDC) WHAT IS THE CONCLUSION? HYPOTHESES A case-control (or retrospective) study was conducted to investigate a relationship between the colors of helmets worn bymotorcycle drivers and whether they are injured or killed in a crash. Results are given in the accompanying table. Using a0.01 significance level, test the claim that injuries are independent of helmet color.BlackColor of HelmetWhite Yellow RedBlueControls (not injured)4993903717246Cases (injured22111297122or killed)Click here to view the chi-square distribution table.

Step 1: Identify the hypothesis to be used for a chi-square testThe null hypothesis for a chi-square…

Answered: A case-control (or retrospective) study…

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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Not all visitors to a certain company's website are customers or potential customers. In fact, the company's executives estimate that about 5% of all visitors to the website are looking for other websites. Assume that this estimate is correct and that a random sample of 50 visitors to the website is taken. Answer the following. (If necessary, consult a list of formulas.) (a) Estimate the number of visitors in the sample who actually are looking for the company's website by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response. (b) Quantify the uncertainty of your estimate by giving the standard deviation of the distribution. Round your response to at least three decimal places.
Workers at a private business was given a grade (A, B, C) based on their yearly performance. Thedata was recorded along with the department they belong. The results obtained using MINITAB areshown below: a) Carefully define the null and alternative hypotheses of the ?2 test of the above table.b) Find the missing values ‘*’, ‘**’, ‘***’ ??, ??? c) What is the conclusion of this test? Give reasons for your answer.
A private opinion poll is conducted for a politician to determine what proportion of the population favors adding more national monuments. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4.4%?a) a pilot study indicates that the percentage is 69.9%? b) no prior estimates are used?
9
17 - In an exam attended by 1000 people, the average of the grades is 75 and the standard deviation is 5.5, showing a normal distribution. Forty samples of n=25 people were taken from this population for non-refundable draws. How many of these 40 samples averaged in the range of [72-78].a) 37 B) 29 C) 17 D) 40 E) 32
A researcher has collected a sample of 25 respondents and the mean was calculated as 500. The sample was randomly drawn from a normal population whose standard deviation is 15.a) Estimate the population mean with 99% confidence b) Repeat the part (a) changing the population standard deviation to 30. c) Repeat the part (a) changing the population standard deviation to 60. d) Describe what happens to the confidence interval estimate when thestandard deviation is increased.
The P-values based on a one-sided alternative hypothesis will always be value based on a two-sided alternative hypothesis on the same data. A) larger than B) smaller than C) the same as the P-
c) A simple random sample of 200 names from a list of 3042 names and addresses wereinvestigated and the record shows that 38 had wrong addresses. i. Estimate the total number of addresses that needs correction Compute the standard error of your estimate in (i) above .
From 300 electrical components selected at random from the product of a factory 15 of them are defective. Use formula and test the claim that the proportion of defective items is less than 0.06. Use 2 decimal places. a) write the hypotheses b) calculate the test statistic by using formula c) calculatethep-valueusing Minitab and report the supported graph d) write the meaning of the p-value in words e) make decision by using p-value and using the significance level 10%. f) write an overall interpretation about the research question. g) Explain and check the conditions that are required for the test to be valid.
Not all visitors to a certain company's website are customers or potential customers. In fact, the company's executives estimate that about 10% of all visitors to the website are looking for other websites. Assume that this estimate is correct and that a random sample of 40 visitors to the website is taken. Answer the following. (If necessary, consult a list of formulas.) (a) Estimate the number of visitors in the sample who actually are looking for the company's website by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response. (b) Quantify the uncertainty of your estimate by giving the standard deviation of the distribution. Round your response to at least three decimal places.
14 -It is known that the average of blood pressure values in a community is normally distributed with 130mmHg and the standard samas with 25mmHg. What is the percentage of people with blood pressure between 110-140 mmHg?A)23,55 B)41,58 C)34.99 D)50.61 TO)44.35
None

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