A study was made of 413 children who were hospitalized as a result of motor vehicle crashes. Among 290 children who were not using seat belts, 50 were injured severely. Among 123 children using seat belts, 16 were injured severely. Is there sufficient sample evidence to conclude at the 0.05 significance level, that the rate of severe injuries is lower for children wearing seat belts? Based on these results, what action should be taken?

Q: A study was performed to determine the percentage of people who wear life vests while out on the…

A: Answer  Given  Sample proportion [p1] =0.886 Sample proportion [p2] =0.935 sample size [n1] =500…

Q: Consider a drug testing company that provides a test for marijuana usage. Among 315 tested​…

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Q: Researchers reported a study in which 396 domestic violence defendants were randomly assigned to…

A: The number of people arrested within 12 months in the counselling group is 48 out of 224.

Q: onsider a drug testing company that provides a test for marijuana usage. Among 344 tested​…

A: The provided information is  n=344x=26α=0.01p^=xn=26344=0.075 a. The null and alternative hypothesis…

Q: A graduate student believes that people consider faces with more contrast between eye color and skin…

A: Explanation for the first part: Given a null hypothesis H0, we either conclude that there is not…

Q: Illustrates the effect of  significance level on the power of a two-sample t test?

A: Power of a hypothesis test: The probability of not committing a Type II error is called the power of…

Q: In a certain school district, it was observed that 35% of the students in the element schools were…

A: Solution

Q: It was studied in the past that 38% of all adults favored death penalty. Do we have reason to…

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Q: ner together seven nights a week has decreased? Use the a = 0.05 significance level. cause npo (1-…

A: We have given that  Sample size n = 1126 Favorable cases x = 305 Sample proportion p^=x/n

Q: 4. In a study at a hospital, 60 out of 120 smokers and 80 out of 200 nonsmokers were found to have…

A: Formula : Test statistic

Q: Suppose 214 subjects are treated with a drug that is used to treat pain and 53 of them developed…

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Q: Consider a drug testing company that provides a test for marijuana usage. Among 253 tested​…

A: The appropriate Null and Alternative Hypotheses are given below:   From the given information, the…

Q: What would the p-value be for a sample if the test statistic is 0.968 and the significance level is…

A: Given data: Test statistics = 0.968 The test is assumed to be right tailed test. Significance level…

Q: The percentage of physicians who are women is 32.4%.  In a survey of physicians employed by a large…

A: This problem can be solved by using test of significance for single proportion. In usual notations,…

Q: A health organization asserts that the prevalence of smoking among male adults 18 years or older in…

A: The test hypotheses are: Null hypothesis: H0: p1 = p2 Alternative hypothesis: Ha: p1 > p2. Test…

Q: The Survey of Study Habits and Attitudes (SSHA) is a psychological test designed to measure various…

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Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: From the provided information, Sample size (n) = 54 Out of which 35 involved an intoxicated driver.…

Q: A clinical psychologist studies the effects of tonsillectomy and adenoidectomy on aggressive…

A: It is provided that there are three groups for which the number of observations in each group are nA…

Q: In a random sample of​ males, it was found that 24 write with their left hands and 226 do not. In a…

A: State the hypotheses. Let p1 denotes the proportion rate of left handedness in males. Let p2 denotes…

Q: Students in an English course center were divided into 4 groups and took courses from different…

A: Given information: Number of groups is 4. Level of significance is 0.1. The following information is…

Q: Consider a drug testing company that provides a test for marijuana usage. Among 324 tested​…

A: Given that  Sample size=324 Number of subjects wrong (X)=26 Population proportion=0.10 Significance…

Q: Glaucoma is a common eye disease, which in most cases is associated with too high pressure inside…

A: Glaucoma, a common eye disease often associated with elevated intraocular pressure, poses a…

Q: A survey of 1200 TV households showed that 53.5% of them had at least one stand-alone streaming…

A: Let p be the population proportion  p=majority=1/2=0.50=50%, n=1200, p^=sample…

Q: In a random sample of 315 people 90 of them were smokers. Based on the above sample test whether the…

A:

Q: Suppose 236 subjects are treated with a drug that is used to treat pain and 53 of them developed…

A:

Q: Consider a drug testing company that provides a test for marijuana usage. Among 292 tested​…

A:

Q: A psychologist believes that the frequency that a person engages in sexual activity without a…

A: Chi square test is used to determine the independence of variables in the data set. There are four…

Q: Suppose 214 subjects are treated with a drug that is used to treat pain and 54 of them developed…

A: Given that, x=54,n=214 The sample proportion is, Null and alternative hypothesis:

Q: In a study of 824 randomly selected medical malpractice​ lawsuits, it was found that 481 of them…

A: Probability: Probability is the measurement of the probability that an event will occur in a Random…

Q: onsider a drug testing company that provides a test for marijuana usage. Among 316 tested​ subjects,…

A: Given that, x=29,n=316 The sample proportion is,

Q: According to a publication, 12.6% of 18 to 25-year-olds were users of marijuana in 2000. A recent…

A: From the provided information, 12.6% of 18 to 25 years old were users of marijuana in 2000 that is p…

Q: According to a survey by the Consumer Reports National Research Center of 1003 adults, 542 adults…

A: To test the claim that more than 50% of the adults are annoyed by food that does not look or taste…

Q: Suppose 243 subjects are treated with a drug that is used to treat pain and 50 of them developed…

A: Given, The number of subjects treated with a drug that is used to treat pain is n=243 The number of…

Q: What is the P value?

A: We have given that  p0=39/(32+39)=0.5493 α=0.05

Q: It is believed that from among senior high school students, 15% would like to pursue engineering…

A: It is believed that from among senior high school students, 15% would like to pursue engineering…

Q: Sigridur investigates whether the athletes who wear red sho than those wearing other colors. She…

A: In experiments, randomization is used to randomly allocate the treatments among the subjects of the…

Q: Suppose 219 subjects are treated with a drug that is used to treat pain and 51 of them developed…

A: From the provided information, Population proportion (p) = 0.20 Sample size (n) = 219 Out of which…

Q: What is the conclusion? A recent survey done by the Philippine Housing Authority found that 35% of…

A: The hypotheses are given below: Null hypothesis: H0:p=0.35 Alternative hypothesis: H1:p≠0.35 Since…

Q: Consider a drug testing company that provides a test for marijuana usage. Among 349 tested​…

A: Given that,  x=26,n=349 The sample proportion is,

Q: Can you rework this basing the decision on the P-value corresponding to the observed value of the…

A: We have given that n1 = 40, x̅1= 9.1 s1 = 1.9 n2 = 50, x̅2 = 8.0 s2 = 2.1 Significance level (α) =…

Q: Consider a drug testing company that provides a test for marijuana usage. Among 253 tested subjects,…

A:

Q: er the age of 18 who eat dinner toget than the level of significance. Theref an the level of…

A: Given data number of success , x= 515.0 sample size, n = 1172 population…