An insurance company claims that the average automobile on the road today is less than 6 years old. A random sample of 15 cars had a average age of 5.4 years with a sample standard deviation of 1.1 years. Assume the population is normally distributed. Test the claim at the α=.05 significance level by comparing the calculated t-score to the critical t-score.

Q: The weights of salmon grown commercially are normally distributed with a standard deviation of 1.2…

A: Given information Sample mean = 7 pounds Population mean = 7.6 Sample size = 16 Population Standard…

Q: A simple random sample of 26 filtered​ 100-mm cigarettes is obtained from a normally distributed​…

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Q: Can repressed anger lead to higher blood pressure? In a hypothetical study, 16 college students with…

A: Let, X be mean blood pressure. Given, n= sample size = 16 μ = population mean= 120 σ = population sd…

Q: A shop owner claims that on average, his shop has a daily turnover of R55000. Test this claim at the…

A: We have given that  Sample size n=68 , xbar=57750, sigma =3250 ,  level of significance =alpha =0.01

Q: A drug store claims that the mean delivery time for medicines is less than 120 minutes with a…

A: Givendrug store claims that the mean delivery time for medicines is less than 120 minutesstandard…

Q: The piston diameter of a certain hand pump is 0.7 inch. The manager determines that the diameters…

A:

Q: the tensil strength of spot welds produced by a robot welder is approximately normally distributed,…

A: Given that, μ=10000,σ=800,n=40 The probability that the sample mean will be at least 10,200 pounds…

Q: A sample of 10 North Seattle College students produces an av- erage IQ of 95 with a sample standard…

A: The random variable is IQ. There are two types of college students which are North Seattle College…

Q: Based on the specifications provided by the process designer, the standard deviation of casting…

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Q: A random sample of size 24 from a normal distribution has standard deviation s=66. Test H0:σ=36…

A: Given Information: Sample size (n) = 24 Standard deviation (s) = 66 Significance level α=0.10   Null…

Q: A soft drink bottler purchases glass bottles from a vendor. The bottles are required to have an…

A: Solution : Given that, The bottle required internal pressure of at least 150 pounds psi Let, X be…

Q: A rental agent claims that the mean monthly rent,  μ, for apartments on the east side of town is…

A: As given: A rental agent claims that the mean monthly rent, μ, for apartments on the east side of…

Q: A simple random sample of 26 filtered 100-mm cigarettes is obtained from a normally distributed…

A: Null and alternative hypotheses: Null hypothesis: H0: σ= 0.25 Alternative hypothesis: H1: σ≠ 0.25…

Q: At the 0.05 level of​ significance, is there evidence that the mean life is different from 7,543…

A: Solution: Given: Sample mean is = x= 7243 and the known population standard deviation is σ = 1080…

Q: A researcher claims that the mean sodium content of sandwiches at Restaurant A is less than the mean…

A: n1 = 22n2 = 28   x1 =670x2 = 690 s1 = 20s2 = 30

Q: A company produces electrical devices that are operated by thermostatic control. The standard…

A: Given Sample Size , n = 20 Sample standard deviation = 3.36 Significance level = 0.1

Q: Assume that the population is normally distributed and that the sample has been randomly selected. A…

A: Solution: From the given information, the sample variance is S=4.7 cm, population variance is σ=3.5…

Q: The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the diameters…

A:

Q: A sports equipment company develops a type of synthetic fishing line which is claimed to have an…

A: One sample z-test is used to test the difference between sample mean and population mean when the…

Q: The average expenditure per student (based on average daily attendance) for a certain school year…

A: Computation of test statistic value: Sample size is greater than 30 and the population standard…

Q: A coin-operated drink machine was designed to discharge a mean of 9 ounces of coffee per cup. In a…

A: Given: n = 20 Sample mean = x bar = 8.95 sample standard deviation = s = 0.13 Level of significance…

Q: A telecommunications company claims that households receive an average of 40 telephone calls per…

A: From the given information, μ=40 calls σ=5 callsn=35x=36α=0.10

Q: A sample of 20 cans of tomato juice showed a standard deviation of 0.4 ounces. A 95% confidence…

A: we have given that, sample size = 20 standard deviation = 0.4 now, variance= (standard deviation)^2…

Q: Compute the z-score for X (the target GPA from the Research Question) if the standard deviation of…

A: Given:   Sr. No. GPA 1 2.9 2 2.9 3 3 4 3.1 5 3.1 6 3.1 7 3.15 8 3.15 9 3.2…

Q: A sample of 50 copper wires had a mean resistance of 1.03 mΩ with a standard deviation of 0.1 mΩ.…

A:

Q: A physician claims that joggers' maximal volume oxygen uptake is greater than the average of all…

A:

Q: In a sample of 50 business trips taken by employees in the HR department, a company finds that the…

A: Test statistic is 2.05 Critical value is 2.57

Q: A/A batch of 2500 resistors is normally distributed, with a mean resistance of 1.5 ohms and a…

A: Note:-Since you have asked multiple questions, we will solve the first question for you. If you want…

Q: A cable brand claims to have a breaking strength of at least 900 pounds with a standard deviation of…

A: We are using standard normal table

Q: A manufacturer is interested at the output voltage of a power supply for the laptop. Output voltage…

A: Given that, a manufacturer is interested at the output voltage of a power supply for the laptop.…

Q: A medical investigation claims that the average number of infections per week at a hospital in…

A: From the provided information, Sample size (n) = 10 Sample mean (x̅) = 17.7 Sample standard…

Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A: Given Information: Mean life of a large shipment of CFLs is equal to 7,537 hours. i.e., μ0=7,537…

Q: The average test scores in a Science class is normally distributed with a standard deviation of 8.…

A: Solution : Given : σ = 8             n  = 200             x¯  = 170 Confidence level = 0.85      ∴…

Q: A textile mill company is investigating a new drapery yarn, which the company claims have a mean…

A:

Q: The average expenditure per student (based on average daily attendance) for a certain school year…

A: State the hypotheses Since, the direction of tail is not given it has been assumed as two tail test.…

Q: The average farm size in the United States is 444 acres. A random sample of 40 farms in Oregon…

A:

Q: The​ quality-control manager at a compact fluorescent light bulb​ (CFL) factory needs to determine…

A:

Q: In a particular city, the average annual salary for secretaries is $28,000.   A sample of 50…

A:

Q: The piston diameter of a certain hand pump is 0.4 inch. The manager determines that the diameters…

A: Test for Population Standard Deviation Chi-Square Test : Chi-Square Test is used to test the…

Q: Random samples of two species of iris gave the following petal lengths (in cm). x1, Iris virginica…

A: The given dataset is: x1 5.9 5.9 4.5 4.9 5.7 4.8 5.8 6.4 5.9 5.9 x2…

Q: Do students who are members of fraternities or sororities have GPAs different from the student body…

A: State the hypotheses That is, there is no evidence to conclude the members of fraternities or…

Q: A gallon of paint claims to cover 400 sq ft. To test this, a research lab obtained 30 random gallons…

A: It is given that the p-value is 0.212.

Q: A factory which produces steel ball bearings claims that the standard deviation in the weights of…

A:

Q: A soft drink bottler purchases glass bottles from a vendor. The bottles are required to have an…

A: Given data A soft drink bottler purchases glass bottles from a vendor The bottles are required to…

Q: A coin-operated drink machine was designed to discharge a mean of 6 ounces of coffee per cup. In a…

A: One sample t-test: One sample t-test is used to test the significance difference between population…

Q: A fishing line manufacturer tests the breaking stain of his products. He has found that, for a…

A: Given,mean(μ)=21.5standard deviation(σ)=1.5

Q: It has long been stated that the mean lémper temperature of humans is less than 98 6°F They measured…

A: From the given data state the hypotheses

Q: The piston diameter of a certain hand pump is 0.6 inch. The manager determines that the diameters…

A: a. The hypotheses for the test are given below: Null hypothesis: H0: σ=0.007. Alternative…

Q: A gallon of paint claims to cover 400 sq ft. To test this, a research lab obtained 30 random gallons…

A: The p-value is 0.212.