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: An article in a journal reports that​ 31% of American fathers take no responsibility for child care.…

A: Given, Population proportion P=31%=0.31 Sample size of fathers n=235 Number o fathers who did not…

Q: In a survey of 909 U.S.adults with children conducted by the financial Industry Regulatory…

A: The hypotheses for the test is given below.Null hypothesis:H0: p = 0.30Alternative hypothesis:H1: p…

Q: a) What is the level of significance? State the null and alternate hypotheses. H0: ? = 13.5; H1: ?…

A: Let μ be the population mean average mileage driven. Given that, Population mean (μ) = 13.5…

Q: The National Academy of Science reported that 38% of research in mathematics is published by US…

A: Solution: Given data p = 0.38 Sample size( n) = 279 x = 123 Level Of significance = 0.02 To Test the…

Q: A random sample of 113 felons convicted of nonviolent crimes in a state prison system completed a…

A: Given , n= 113 , x = 58 Here One prop Z test is applicable

Q: it is claimed that 60% of stats professors like shirts. in a survey of 53 professors, 36 likes them.…

A: Stating the appropriate null and alternative hypotheses:Based on the study, it was found that 60% of…

Q: A survey of 50 girls in canada who played soccer in the summer found that 35 of them also played…

A: sample size(n)=50No.of girls played volleyball in the winter(x)=35

Q: A labor statistician claims that 6% of the labor forces will be laid off likely  to pandemic impact.…

A: Solution: Let X be the number of employees will be likely to be laid off and n be the sample number…

Q: In a random sample of 400 residents, 220 support a 0.3% sales tax increase to build a new high…

A: Here, the null hypothesis is that majority of local residents support the tax increase. The…

Q: the food marketing insititute reports that 28% of households spend less than $100 per week on…

A: the probability that less than 102 households spend less than $100 per week on groceries is…

Q: It has been claimed that at UCLA 43% of all students live on campus. Researcher Ebony Robinson…

A: Given X=112 n=250

Q: A statistical study is made to compare the % of smokers in small rural towns to the overall smoking…

A: Given Information:n=1500x=285c=95%=0.95

Q: One manufacturer claims that less than 6% of their fax machine is malfunctioning. In a random sample…

A:

Q: Based on information from the Federal Highway Administration web site, the average annual miles…

A: Consider that μ is the national average of the mileage.

Q: Researchers wish to test whether marijuana use among full-time college students aged 19-22 at a…

A: 1) The appropriate Null and Alternative Hypotheses are given below: From the given information, the…

Q: Researchers claimed that women exercise at the same proportion as men do. To test this claim, a…

A: For the given data Perform Z test for two proportions

Q: A research center claims that at least 23% of adults think their taxes will be audited.  A random…

A: Yes, there is a enough evidence to reject the claim Explanation:Step 1 : Formulate the hypothesis…

Q: According to a local chamber of commerce, in 1993, 5.9% of local area residents owned more than five…

A: State the hypotheses. That is, there is no evidence that the percentage of the local area residents…

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: The Mayoral challenger claims that less than 30% of residents over the age of 25 have bachelor's…

A:

Q: A recent study indicated that 18% of people free from cardiovascular disease were considered obese.…

A:

Q: Reports show that 92% of online searches in March 2021 use Google as the search engine. A network…

A: Given: p=0.92 p^ = 758800=0.9475 α = 0.05 to test the hypothesis of proportion of searches that use…

Q: A prognosticator makes 700 predictions regarding the outcomes of football games, and is correct with…

A: Solution-: Here, we use proportion test (Z-test) Given: x=546,n=700,P0=0.80,α=0.05 We want to a 5%…

Q: significance level, do the data provides sufficient evidence to conclude that the  mean calcium…

A: Here use one sample t test  Because population standard deviation unknown and sample size also…

Q: A simple random sample of 300 men included 71 who smoke, and a simple random sample of 310 women…

A: Given: Sample sizes: Sample of men n1=300 Sample of women n2=310 Number of men who smoke X1=71…

Q: home improvement company is interested in improving customer satisfaction rate from the 58%…

A: We have given that  Sample size n=273 favorable cases x=171  Population proportion p=58%=0.58 Sample…

Q: A home improvement company is interested in improving customer satisfaction rate from the 51%…

A: Step 1:Suppose p is the customer satisfaction rate of the population.It is needed to test whether…

Q: A random survey of enrollment at 10 community colleges across the United States yielded the…

A: Solution: Let X be the random variable. The given data for X is 2523, 1707, 5420, 2835, 1129, 5452,…

Q: Determine the test statistic for the hypothesis test. Round the solution to two decimal places.…

A: