QUESTION 20 The manager of a paint store, wants to estimate the mean amount of a product sold per day. He selected a sample of 25 business days and found a sample mean of 61 litres and a sample standard deviation of 24. Assuming that the daily amounts are normally distributed, calculate the lower confidence limit (LCL) of the 92% confidence interval for the mean amount of the product sold per day. If needed, round your answer to two decimal places.

Q: In a sample of 100 patients that did not receive the flu shot, the average recovery time after being…

A: The random variable recovery time follows normal distribution. The sample size is 100. The sample…

Q: A survey conducted in July 2015 asked a random sample of American adults whether they had ever used…

A: p₁-p₂ = 0.17-0.14 = 0.03 Confidence Level = 95 Significance Level = α = (100-95)% = 0.05…

Q: QUESTION # 1. The measured voltage amounts from a sample of 27 households have a mean of 123.59…

A: It is given that the mean of measured voltage is 123.59, standard deviation is 1.38 and the sample…

Q: Question 3: A random sample of 55 observations produced a mean value of 28 and a standard deviation…

A: Given  mean=x̄=28, n=55, s=1.3

Q: A reporter for a student newspaper is writing an article on the cost of off-campus housing. A sample…

A: According to the provided data, the sample size, n is 10. The sample mean is $550 and the sample…

Q: Question 2 Grace Floral Shop claims that their average daily earnings is $497. An auditor wants to…

A: Null Hypothesis (H0): μ=497, the mean earning is $497Alternative Hypothesis (H1): μ<497, i.e the…

Q: Question 5 (11 points) Forty-five (45) small communities in the US state of Connecticut reported on…

A:

Q: The quality-control manager at a light bulb factory needs to determine whether the mean life of a…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: Question 4. Suppose the mean weight of King Penguins found in an Antarctic colony last year was 15.4…

A: Given n=35 x=14.6σ=2.5μ=15.4α=0.01

Q: QUESTION 39 Suppose we calculated the 95% confidence interval for the mean amount of oil recovered…

A: From the given information, Consider, sample size (n) =50 Provided 95% confidence interval = (18250,…

Q: QUESTION 2 a) Measurements of the length of a random sample of 200 rods made by a certain machine…

A: The given frequency distribution table is Classes Frequencies 60-62 5 63-65 18 66-68 42…

Q: b. With 95% confidence the population mean number of visits per week is between ____ and ____…

A: here given , n= 238  df = n-1  = 237  sample mean = 3.2  sample standard deviation  =  1.6

Q: Many medical professionals believe that eating too much red meat increases the risk of heart disease…

A:

Q: QUESTION 5 A recent study based on 25 families showed that the average cost of education, from…

A:

Q: A fitness center is interested in finding a 90% confidence interval for the mean number of days per…

A: The random variable number of visits per week follows normal distribution. We have to construct the…

Q: QUESTION 7 You interview a sample of 100 employees who have left the company. You want to estimate,…

A:

Q: In a random sample of forty-eight 200-metre swims has a mean time of 3.12 minutes and a standard…

A: It is given that sample mean is 3.12 and standard deviation is 0.09.

Q: QUESTION 20 Suppose the 90% confidence interval for the mean SAT scores of applicants at a business…

A: We have given that,  90% confidence interval = (1685, 1825) and sample size (n) = 16 Then,  We will…

Q: QUESTION 17 Lena finds that, in a sample of 36 children, the mean age at which they first begin to…

A:

Q: QUESTION 1 Xona, a photocopy company plans to estimate the mean of visitors to its shop. There was a…

A: Given Standard deviation=σ=23 Confidence level=95% i.e. 100(1-alpha)%=95% Therefore, α=0.05 Allow…

Q: Question 4 The average height of students in a freshman class of a certain school has been 165.24 cm…

A: Yes there is sufficient evidence to believe that the height of freshman student changed based on…

Q: QUESTION 3 To estimate the average time it takes to assemble a certain computer component, the…

A: As per guidelines expert have to answer first question only..

Q: (a) A study by the International Coffee Organisation found that persons aged 30 – 59 drank an…

A:

Q: QUESTION 24 To estimate the average time it takes to assemble a certain computer component, the…

A: We have given that , Sample mean Xbar=12.5 Sample standard deviation (s)=2 Sample size = 25  We have…

Q: Question 3 A sample of 44 commuters in Chicago showed the average of the commuting times was 33.2…

A: "Since you have asked multiple questions, we'll solve the first question for you. If you want any…

Q: Question 11 You collect data on N= 15 student weights and find that the average student weight (X)…

A: Solution -Given that xbar=125 pounds  The sample standard deviation s=17.2 pounds  Confidence level…

Q: QUESTION 4 The national IQ test has a mean of 100 and a standard deviation of 15. Suppose a simple…

A:

Q: QUESTION 4 A data set includes a random sample of 108 body temperatures (in degrees Fahrenheit) of…

A: Given  n=108, Xbar=98.2 s=0.65 note:According to Bartleby Expert guideline, we can answer only first…

Q: Question 2 It is known that the population wellbeing level of female follows a normal distribution.…

A: State the hypotheses. That is, there is no evidence to conclude that the average well being score…

Q: part 3 question 1 A survey of 35 adults found that the mean age of a person's primary vehicle is…

A: 95% confidence level α=1-0.95   =0.05zα2=1.96

Q: The % of alcohol content is normally distributed for the mouthwash of brand A, with a standard…

A: Solution-: Given: n=13, s=0.07 (7%), σ0=0.05 (5%) We want to find the 95% C.I. for  σ ?

Q: 2 A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors…

A: Formula for the sample size needed to estimate a population mean is

Q: QUESTION 4 A report shows that the average cost of tuition and fees at a four-year university is…

A:

Q: QUESTION 1 In a phone manufacturing company, the management would like to know the mean defective…

A:

Q: QUESTION 3 The national IQ test has a mean of 100 and a standard deviation of 15. Suppose a simple…

A:

Q: QUESTION 3 Xora, a photocopy company plans to estimate the mean of visitors to its shop. There was a…

A: Given : Margin of error, ME = 5.0 population standard deviation, σ = 87.0…

Q: QUESTION 6 To estimate the average time it takes to assemble a certain computer component, the…

A:

Q: Question 6 Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her…

A:

Q: QUESTION 3 A hardware store determined the current balances for a random sample of 100 customers…

A: Ans - Sample mean = $100  ans sample standard deviation (s) = The Population standard deviation (σ)=…

Q: Question 2: A polling company surveys the residents of a certain city (population 65,054) to…

A: given  n=250 x=80

Q: QUESTION 1 The quality-control manager at a light bulb factory needs to determine whether the mean…

A:

Q: Question 3 In a simple random sample of 1600 young people, 86% had earned a high school diploma. a.…

A: Solution According to guidelines we solve three subpart

Q: Data from the Bureau of Labor Statistics reports that the typical manufacturing worker in Wisconsin…

A:

Q: Question 4 a) Teens are reported to watch the fewest total hours of television per week of all the…

A:

Q: QUESTION 9 If the population standard deviation is equal to 7.68 and the sample size is 117, what is…

A: Given : Population SD (σ) = 7.68 Sample Size (n) = 117 Confidence Level = 97% So ; significance…

Q: Question 14 Provide an appropriate response. In a random sample of 26 laptop computers, the mean…

A: Given information: n = 26 μ=$150, σ=$35

Q: Grace Floral Shop claims that their average daily earnings is $497. An auditor wants to determine…

A: (a) Obtain the 97% confidence interval for the population mean daily earning. The 97% confidence…

Q: Question 15: In a survey, 12 people were asked how much they spent on their child's last birthday…

A: Given,sample size(n)=12sample mean(x¯)=44standard deviation(s)=5degrees of…

Q: On a particular day, Mobay electronics produced 1000 electric bulbs at a mean production rate of 10…

A: Given Information: Sample size n=1000 Sample mean x¯=10 Population standard deviation σ=2000