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- A second-stage smog alert has been called in a certain area of LosAngeles County in which there are 50 industrial firms. An inspector willvisit 10 randomly selected firms to check for violations of regulations. a. If 15 of the firms are actually violating at least one regulation,what is the pmf of the number of firms visited by the inspector thatare in violation of at least one regulation?b. If there are 500 firms in the area, of which 150 are in violation, approximate the pmf of part (a) by a simpler pmf.c. For X= the number among the 10 visited that are in violation,compute E(X) and V(X) both for the exact pmf and theapproximationg pmf in part (b).at a factory the emplyess were surveted and classified according to their level of education and if they smoked. educational level smoking habit Not hs graduate hs graduate college graduate smoke 6 14 19 dont smoke 18 7 25 if an emolyee is selected at random find these prob. a) the emplyoee smokes given that he or she graduated from college b) given that the employee did not graduate hs, he or she is a smokerWere any assumptions required in order for this inference to be valid?a. Yes, the sample of network 1 ad-breaks must be independent of the sample of network 2 ad-breaks.Each population must be normally distributed, i.e. the population of all ad-breaks shown on network 1 have lengths that must be normally distributed and the population of all ad-breaks shown on network 2 have lengths that must be normally distributed.b. Yes, the sample of network 1 ad-breaks must be independent of the sample of network 2 ad-breaks.The Central Limit Theorem applies, which states the sampling distribution is normal for any population distributions.c. No. The Central Limit Theorem applies, which states the sampling distribution is normal for any population distributions.d. Yes , each population must be normally distributed, i.e. the population of all ad-breaks shown on network 1 have lengths that must be normally distributed and the population of all ad-breaks shown on network 2 have lengths that must be…
- A random sample of 1200 apples was taken from a large consignment and found that 10% of them are bad. The supplier claims that only 2% are bad. Test his claim.A research center claims that that 31% of adults in a certain country would travel into space on a commercial flight if they could afford it. In a random sample of 1200 adults in that country, 33% say that would travel into space on a commercial flight if they could afford it. At alpa= 0.05, isthere enough evidence to reject the research centers claim complete parts a through d belowA research center claims that 29% of adults in a certain country would travel into space on a commercial flight if they could afford it. In a random sample of 1000 adults in that country, 33% say that they would travel into space on a commercial flight if they could afford it. At α=0.10, is there enough evidence to reject the research center's claim? (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. No more than nothing% of adults in the country would travel into space on a commercial flight if they could afford it. B. nothing% of adults in the country would travel into space on a commercial flight if they could afford it. C. The percentage adults in the country who would travel into space on a commercial flight if they could afford it is not nothing%. D. At least nothing% of…
- An experiment consists of selecting three items from a box of several items. The three items areclassified defective (D) or non defective (N) as they are selected. Give the sample space for thisexperiment: A, B, and C, where A is exactly one defective.If 4% of the bottles produced by a company are defective.determine the probabilkities of sample that in 100 bottles (a) two and (b) more than two will be defectiveA second-stage smog alert has been called in a certain area of Los Angeles County in which there are 50 industrial firms. An inspector will visit 10 randomly selected firms to check for violations of regulations. a. If 15 of the firms are actually violating at least one regulation, what is the pmf of the number of firms visited by the inspector that are in violation of atleast one regulation? b. If there are 500 firms in the area, of which 150 are in violation, approximate the pmf of part (a) by simpler pmf. c. For X = the number among the 10 visited that are in violation, compute E(X) and V(X) both for the exact pmf and the approximating pmf in part (b).
- A research center claims that 28% of adults in a certain country would travel into space on a commercial flight if they could afford it. In a random sample of 1100 adults in that country, 32% say that they would travel into space on a commercial flight if they could afford it. At α=0.01, is there enough evidence to reject the research center's claim? (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. No more than enter your response here% of adults in the country would travel into space on a commercial flight if they could afford it. B. At least enter your response here% of adults in the country would travel into space on a commercial flight if they could afford it. C. enter your response here% of adults in the country would travel into space on a commercial flight if they could afford it.…Suppose we observe 84 alcoholics with cirrhosis of theliver, of whom 29 have hepatomas—that is, liver-cell carcinoma.Suppose we know, based on a large sample, that therisk of hepatoma among alcoholics without cirrhosis of theliver is 24%. 5.52 What is the smallest number of hepatomas that wouldhave to be observed among the alcoholics with cirrhosis ofthe liver for the hepatoma experience in this group to differfrom the hepatoma experience among alcoholics withoutcirrhosis of the liver? (Hint: Use a 5% probability of gettinga result at least as extreme to denote differences betweenthe hepatoma experiences of the two groups.)In a study of self-adheave bandages, a doctor wamed to moe if there was truly a diterence in the healing time between the self-adhesive bandyger preiagded with antikiedic ind the seif adhetive bandages used with an antiblotic applied to the wound. The doctor randomiy selected 119 patients to partioipate in the stuify and divided theon into thro qoups. days, it took for the wound to heal was recorded. In Groug 1. the mean healing time was 4.42 days with a itandard deviation of 1.5, and the mean for Group 2 was 3.71 dayi with a standard deviation of 1.7 (a) Which of the following is the best way to describe this study? 1.Experiment with I treatment the types of bandages used Obseryational utudy Experiment with 2 treatments: the handages with antibetic and the bandajes with antebiotic applied fint. Experiment with 1 theatmant: the type of antibilotic usad (b) Find the df, Show your wotk and round yaur answer down to the nearest whele number. applied to the vound first. show your work and…