Question 5"At a certain college, it is estimated that about 37% of thestudents have cars on campus, and with this number, theparking lot is fully occupied. Would you suggest toincrease the parking lot space if, in a random sample of 48college students, 24 are found to have cars? Use 0.01 levelof significance."AThere is sufficent evidence to say that there is aneed to increase the parking lot space.It is safe to assume that the parking lot isenoughC) "Certainly, the parking lot is enough."BD) No sufficient data to make a conclusion.

Suppose p is the true population proportion of students who have cars on campus.

Answered: "At a certain college, it is estimated…

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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Question 02 There is a claim that drink driving has been very common in high ways. The Highway Police randomly caught 300 drivers for breath alcohol test and found that 14% of drivers have breath alcohol over the legal limit. At 4% level of significance, use the p-value approach to test the hypothesis that the percentage of drivers who are drink driving is more than 10%.
Question #4. US Universities found that 72% of people are concerned about the possibility that their personal records could be stolen over the Internet. If a random sample of 300 college students at a Midwestern university were taken and 228 of them were concerned about the possibility that their personal records could be stolen over the Internet, could you conclude at the 0.025 level of significance that a higher proportion of the university's college students are concerned about Internet theft than the public at large? Report the p-value for this test. Z0.025 = 1.96
Question 2. A random sample of 22 values was selected from a population and the sample standarddeviation was computed to be 340. Based on this sample result, compute a 90% confidenceinterval estimate for the true population standard deviation. Question 3. Two samples of sizes 15 and 16 are drawn from two normally distributed populations havingmeans of 16 and 11, respectively. If the sample variances are 6 and 5, determine whether the firstsample has significantly lower variance than the second sample at 0.025 significance level
Question 18 A quality-assurance inspector periodically examines the output of a machine to determine whether it is properly adjusted. When set properly, the machine produces nails having a mean length of 2.000 inches, with a standard deviation of 0.070 inches. For a sample of 35 nails, the mean length is 2.025 inches. If the null and alternative hypotheses can be used to conclude that the machine is adjusted properly, at 15% level of significance, what is your conclusion? There is enough evidence to support the claim There is no enough evidence to support the claim There is enough evidence to reject the claim There is no enough evidence to reject the claim
QUESTION 2 According to the Driver and Vehicle Licensing Authority (DVLA) in 2019, 81% of the commercial drivers interviewed indicated that they have talked on their cell phones while driving. The survey conducted included drivers aged 16 to 61 years selected from 48 lorry stations in Ghana. Assume that this result holds true for the 2019 population of all such drivers in Ghana. In a recent random sample of 1600 drivers aged 16 to 61 years selected from Ghana, 83% said that they have talked on their cell phones while driving. Find the p-value to test the hypothesis that the current percentage of such drivers who have talked on their cell phones while driving is different from 81%. What is your conclusion if the significance level is 5%?
Suppose an insurance company wishes to determine if the amount of time a patient spends in the hospital is affected by whether or not the patient has medical insurance. The insurance company suspects that since insurance pays most of the hospital bills, a doctor might keep a person who has insurance in the hospital longer than if that person had to pay all of the expenses because he/she did not have insurance. In order to test these suspicions, the company randomly samples the average stay (in days) of both insured and uninsured patients in a number of hospitals and comes up with the following data. Assume the patient data are normally distributed and the population standard deviations are equal. (sorry this is the best example I can give for the problem) the numbers are actually supposed to be on the lower right side (like a square root I guess) Insurance: xbar 1=17.3, s1 =1.2, n1=29 No Insurance: xbar 2=15.1, s2=2.1, n2=15 Does the data provide sufficient evidence to support the…
QUESTION 18 A manufacturer of car batteries claims that his product will last at least 4 years on average. A sample of 50 is taken and the mean and standard deviation are found. The test statistic is calculated to be -1.656. Using a 5% significance level, the conclusion would be: there is sufficient evidence for the manufacturer’s claim to be considered correct there is insufficient evidence for the manufacturer’s claim to be considered correct there is insufficient evidence for the manufacturer’s claim to be considered incorrect there is sufficient evidence for the manufacturer’s claim to be considered incorrect
Question 1 Based on a national survey of adults in U.S, 60 percent of adult believe a phone-in poll of 300,000 people rather than a random sample of 1000 people. Which would you be more likely to believe and why? Question 2 A clinical trial was conducted in which 29 participants were given a pig whipworm egg treatment every 3 weeks for 6 months. At the end of the study, they found 79.3 percent of the subjects in the study experienced a reduction in Chrohn’s disease symptoms. What is the concern with the experimental design of this study? Question 3 You are interested in determining the average age of students at the University. Come up with two questions (and the possible answers they would select, if applicable) in which: 1-Age would be classified as a categorical variable. 2-Age would be classified as a numerical variable Question 4 Knowing the value of determining the sample size prior to the start of a study, you use appropriate sample size formula and calculate the required sample…
Question 21 Only 11% of registered voters voted in the last election. Will voter participation change for the upcoming election? Of the 380 randomly selected registered voters surveyed, 61 of them will vote in the upcoming election. What can be concluded at the αα = 0.01 level of significance? A.)For this study, we should use Select an answer z-test for a population proportion t-test for a population mean B.)The null and alternative hypotheses would be: -H0:H0: ? p μ Select an answer < > ≠ = (please enter a decimal) -H1:H1: ? μ p Select an answer = ≠ < > (Please enter a decimal) c. )The test statistic ? z t = (please show your answer to 3 decimal places.)
Question 19 A manufacture makes light-weight sneakers, and claim that the average weight of one sneaker is no bigger than 2 pounds. To verify this claim, a sample of 9 sneakers are weighed, and the sample mean is 2.4 pounds with the sample variance of 0.25 pounds^2. Assuming the weights of sneakers are normally distributed, we would like to test the claim of the manufacture at 10% level of significance. Please select the correct statement from below:
Suppose an epidemiologic investigation of people entering a STD clinic is performed. It is found that 160 of 200 patients who are diagnosed as having gonorrhea and 50 of 105 patients who are diagnosed as having nongonococcal urethritis have had previous episode of urethritis. Is there any association between present diagnosis and prior episodes of urethritis? (Calculation: test statistic=32.17). Use the data in the table to test the claim, at alpha=0.05, that type of crime is independent of whether the criminal is a stranger (Calculation: Test statistics=119.33) Observed Homicide Robbery Assault Criminal was a stranger 12 379 727 Criminal was a relative 39 106 642
A researcher randomly assigns college freshmen to either of two experimental conditions. Because both groups consist of college freshmen, someone claims that it is appropriate to use a t test for the two related samples. Comments?

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