10. A consumer claims that the mean lifetime of a brand of fluorescent bulbs is less than 1500 hours. She selects 25 bulbs and find the mean lifetime to be 1480 hours with a standard deviation of 80 hours. If you were to test the consumer's claim at the 0.05 significance level, what would you conclude? (A) Fail to reject the null, sample data does not warrant supporting the claim that the mean is less than 1500 hours. (B) Reject the null, sample data warrants supporting the claim that the mean is less than 1500 hours. (C) Fail to reject the null, sample data does not warrant rejecting the claim that the mean is less than 1500 hours. (D) Reject the null, sample date warrants rejecting the claim that the mean is less than 1500 hours.

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A: Empirical rule: The probability that the observation under the normal curve lies within 1 standard…

Q: ts, and the distribution of total study hours per week is bell-shaped with a mean of 14 hours and a…

A: The total study hours per week has mean of 14 and standard deviation of 3.1 hours. μ=14σ=3.1

Q: he president of a university believes the entering class this year has an average ACT score…

A: This is the right tailed test .

Q: O 0.0226 O 0.4885 O 0.5115 O 0.15 O 0.0113

A: Sample mean, Standard deviation, s= 5degrees of freedom, df= 80-1=79The null and alternative…

Q: A headline in USA Today proclaimed “Men and Women are equal talkers. Given below are the results of…

A: To test:H0:μ1=μ2H1:μ1≠μ2

Q: Suppose the mean height of women age 20 years or older in a certain country is 62.2 inches. One…

A: Given: μ0=62.2n=100x¯=61.7σ=3.9α=0.01

Q: The shareholders group claimed that the mean tenure for a chief executive office (CEO) was less than…

A: Null hypothesis: μ=10Alternative hypothesis: μ<10 This hypotheses test constitute a one-tailed…

Q: Suppose the mean height of women age 20 years or older in a certain country is 62.7 inches. One…

A: From the provided information, Population mean (µ) = 62.7 Sample size (n) = 100 Sample mean (x̅) =…

Q: The mean serum-creatinine level measured in 13 patients 24 hours after they received a newly…

A: Given information Sample mean x̅ = 1.1 mg/dL Population mean µ = 1.0 mg/dL Sample size = 13 Standard…

Q: A company claims that, the mean battery life of their cell phone is at least 5 hours and standard…

A: Given,sample size(n)=25sample mean(x¯)=4.8standard deviation(σ)=0.5α=0.04H0:μ<5H1:μ≥5

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A: From the provided information, Mean (µ) = 12 hours Standard deviation (σ) = 3.2 hours

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A:

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A: From the provided information, Mean (µ) = 12 Standard deviation (σ) = 3

Q: For a 4-units class like Statistics, students should spend average of 12 hours per week studying for…

A: Mean (x̅) = 13 hoursStandard deviation (s) = 3 hoursThe empirical rule, also known as the 68-95-99.7…

Q: 16) A simple random sample of 24 filtered 100 mm cigarettes is obtained and the tar content of each…

A: The provided information is:

Q: The government reports that the average plane arrives 10 minutes late, with a standard deviation of…

A: The given data is as follows:Population mean, Population standard deviation, Sample size, Sample…

Q: Imagine a company wants to test the claim that their batteries last more than 40 hours. Using a…

A: Solution-: Given: μ0=40,n=15,x¯=44.9,s=8.9,α=0.05 Claim: The company wants to test the claim that…

Q: The heights of 36 randomly selected horse jockeys found that the average height was 61 inches with a…

A: Given: Sample size of horse jockeys (n) = 36 Sample mean height x¯=61 Sample standard deviation of…

Q: 8

A: Suppose the sample xi; (i=1,2,...,n1) of size n1 has been drawn from the population with mean μ1and…

Q: A company claims that the average customer satisfaction score for their product is 80 out of 100. A…

A: To perform the hypothesis test, we will use the standard formula for a t-score, which is given by:…

Q: The shareholders group claimed that the mean tenure for a chief executive office (CEO) was less than…

A: Denote μ as the true average tenure of chief executive office.   It is needed to check, whether the…

Q: A sample of 9 production managers with over 15 years of experience has an average salary of $71,000…

A: The objective of this question is to determine the sample size needed to estimate the true mean…

Q: A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is greater than…

A: 1) Given data is appropriate for testing of hypothesis to test z-test for single mean. Because it is…

Q: The mean length of a work week for the population of workers was reported to be 45 hours. Suppose…

A: Note:Hey, since there multiple questions  posted, we will answer first question for you. If you want…

Q: Americans eat about 1.85 billion pounds of potato chips, or about 6.6 pounds per person annually. A…

A: Here given: Sample size = n = 32 Sample Mean = x = 8.8 Sample Mean = s = 3.5 Population mean = μ0 =…

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A: Given ,mean (μ)=14standard deviation (σ)=3.1and ,sample size (n)=25

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A: Given information- Sample size, n = 24 Sample mean, x-bar = 13 hours Standard deviation, σ = 2.5…

Q: In a time study conducted at a manufacturing plant, the time to complete a specified operation was…

A:

Q: Scores on a certain "IQ" test for 18-25 year olds are normally distributed. A researcher believes…

A: So we have population mean μ=190 and the researcher claim is that the average IQ score for students…

Q: A dairy farm uses the somatic cell count (SCC) report on the milk it provides to a processor as one…

A: Denote μ as the population mean SCC of all milk produced.

Q: For a 4-unit class like Statistics, students should spend average of 12 hours studying for the…

A: It is given that the mean of 14 and the standard deviation of 2.8.

Q: For a 4-units class like Statistics, students should spend average of 12 hours studying for the…

A: From the provided information, Mean (x̅) = 12 hours Standard deviation (s) = 3.2 hours

Q: Suppose you are a quality control manager at a manufacturing company that produces light bulbs. The…

A: The objective of this question is to determine whether the changes in the manufacturing process have…