An oil company claims that less than 20 percent of all car owners have not tried its gasoline. Test this claim at the 0.01 level of significance if a random check reveals that 22 of 200 car owners have not tried the oil company’s gasoline.

Q: A filling machine for a production operation must be adjusted if 5% of the jars are under- or…

A: Given: The sample number of jars is n=100. The number of jars that are under and overfilled is X=7.…

Q: In a clinical study of an allergy drug 98 of the 202 subjects reported experiencing significant…

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Q: In​ randomized, double-blind clinical trials of a new​ vaccine, children were randomly divided into…

A: The sample size of the experimental group​ (group 1) is 651 in which 116 subjects are experienced…

Q: In a random sample of 1066 U.S. adults, 580 think that the U.S. government is doing too little to…

A: Given Information: Sample size (n1) = 1066 Out of which x1 = 580  think that the U.S. government is…

Q: The plant manager of a company that makes pillows claims that only 8 percent of the pillows made…

A: Answer:-  Given, α=0.05 P-value=0.03 Here, 0.05>0.03

Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

A: The monkeys are randomly divided in to two groups. New vaccine is given to subjects in group 1…

Q: In randomized, double-blind clinical trials of a new vaccine, children were randomly divided into…

A: The following information has been provided Sample size n1=746 Sample size n2=627 Favourable cases…

Q: In​ randomized, double-blind clinical trials of a new​ vaccine, rats were randomly divided into two…

A: Solution: a. Let p1 be the proportion of subjects in group 1 experienced drowsiness as a side effect…

Q: In randomized, double-blind clinical trials of a new vaccine, rats were randomly divided into two…

A: There are 110 of 367 subjects in the experimental group1 experienced drowsiness as a side effect and…

Q: An insurance company models the number of claims filed by a policyholder under a vision care…

A: From the given information, the random variable X follows Poisson distribution. with parameter 2.5…

Q: In a random sample of 400 electrical components, 88 are found to be defective. If the hypothesis is…

A: Since, there is only one sample, them the z-test for one sample is used. Here,  n=400p^=88400=0.22…

Q: Approximately how many cases of rotavirus gastroenteritis would be prevented over a 60 week period…

A: The freedom from severe virus in the vaccinated group is at aroud 99% after 60 weeks whereas in the…

Q: In a simple random sample of 78 NCAA Division III Football games, the team that scored first won the…

A: Denote p as the true proportion of teams that scores first, win the game.

Q: It's on the photo

A: It is given that the sample size of group 1 is 622 and the number of side effect subjects is 116.

Q: In randomized, double-blind clinical trials of a new vaccine, infants were randomly divided into two…

A: Given a trials of a vaccine on two groups and measure the side effects of drowsiness in both the…

Q: State the statistical hypotheses against a population with a mean of 90 for a one-tailed test where…

A: Given: μ=90 The hypotheses for testing the population mean is given bellow: Null hypothesis: H0:…

Q: A researcher selects a sample from a population with a mean of 50 and administers a treatment to the…

A: Given : A researcher selects a sample from a population with a mean of 50 and administers a…

Q: In​ randomized, double-blind clinical trials of a new​ vaccine, infants were randomly divided into…

A: Given Information: Group 1: Sample size (n1) = 387 Out of which X = 126  experienced drowsiness as a…

Q: In a controlled laboratory experiment, scientists at the University of Minnesota discovered that 25%…

A: 1. Let x denote the number of rats that develop tumor. Given: x=16n=48p=0.25α=0.05 Hypothesis: Null…

Q: In randomized, double-blind clinical trials of a new vaccine, infants were randomly divided into two…

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Q: Use the one-proportion z-test to perform the required hypothesis test. In a clinical study of an…

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Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

A: Givenx1=124n1=736p^1=xn=124736=0.1485x2=81n2=617p^2=x2n2=81617=0.1313α=0.01H0:p1=p2H1:p1>p2

Q: The producer of a TV special expected about 40 percent of the viewing audience to watch a rerun of a…

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Q: In randomized, double-blind clinical trials of a new vaccine, infants were randomly divided into two…

A: Given Information: x1=129 n1=674 x2=86 n2=555 Significance level α=0.10   Sample proportion is the…

Q: In a survey of 1005 adult Americans, 46% indicated that they were somewhat interested or very…

A: Introduction: Denote p as the true proportion of people from Country A who are somewhat interested…

Q: In randomized, double-blind clinical trials of a new vaccine, rats were randomly divided into two…

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Q: In a clinical study of an allergy drug, 108 of the 200 subjects reported experiencing significant…

A: Solution: Note: Hello! As you have posted 2 different questions, we are answering the first question…

Q: A dentist hypothesizes that the average time a child spends brushing their teeth is less than 60% of…

A: In the given situation, the claim of the problem is "the average time a child spends brushing their…

Q: A medical research team at a certain university was interested in the effect of daily exercise on…

A: From the given information, we need to test 'whether the variables number of hours exercising per…

Q: It has been determined that 37 out of 100 adult Americans that did not attend college believe in…

A: Consider that p is the true proportion of adults that did not attend college believe in…

Q: Which of the following statements is the proper interpretation of the result regarding the IRR of…

A: From graph it can be seen that 95% confidence interval does not include zero.So,  Option (2) and…

Q: A company wants to show that its cancer drug is effective. To meet the rules it must show that it…

A: The probability of type II error is defined as the probability of not rejecting the null hypothesis…

Q: A car manufacturer claims that less than 10% of its cars should need repairs in the first three…

A: Given : Claim : less than 10% of its cars should need repairs in the first three years of their…

Q: 1. A policeman believes that less than 40% of older drivers speed on highways, but a confidential…

A: The hypotheses can be constructed as: H0: p1 = 0.40 H1: p1 ≠ 0.40 Given: Sample size (n) = 88 Out of…

Q: According to the National Highway and Traffic  Safety Administration,  the proportion of fatal…

A: D) The conditions for hypothesis testing of proportion are: np≥10n(1-p)≥10, here, n represents…

Q: An organization published an article stating that in any one-year period, approximately 11.5 percent…

A: Note: Thank you for the question. Since multiple subparts are posted, according to our policy, we…

Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

A: Here the both the samples are Independent as the respondents are not same for both the doses. There…

Q: A car manufacturer claims that less than 10% of its cars should need repairs in the first three…

A: Given,n=50x=8sample proportion(p^)=xnp^=850=0.16population proportion(P)=0.10H0:P=0.10H1:P<0.10

Q: A researcher was interested in the relationship between a swimmer’s hand length and corresponding…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: In one study of smokers who tried to quit smoking with nicotine patch​ therapy, 38 were smoking one…

A: Given information No of people smoking x = 38 Total people n = 38 + 33 = 71

Q: In randomized, double-blind clinical trials of a new vaccine, children were randomly divided into…

A:

Q: In randomized, double-blind clinical trials of a new vaccine, infants were randomly divided into two…

A: Solution: The null and alternative hypothesis is  Ho:p1=p2    Vs H1:p1>p2

Q: Does stretching before exercise reduce the chance of injury? To answer this question, a random…

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Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

A: Two sample proportion z test: Two sample proportion z test is used to test the significance…

Q: In randomized, double-blind clinical trials of a new vaccine, monkeys were randomly divided into two…

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Q: a random sample of 16 women ( female (F)) , use their weights to test the null hypothesis that the…

A: The appropriate test for the data is One sample t test; H0 : The average weight of all the women on…

Q: B. A chi-square test of independence

A: A scientist selected a random sample of seven varieties of peach ice cream to investigate the…

Q: In randomized, double-blind clinical trials of a new vaccine, rats were randomly divided into two…

A: The null and alternative hypothesis is; H0: p1=p2H1: p1>p2The given level of…