The management of a chain of hotels decided to estimate the mean cost per room of repairing damages caused by its customers. A random sample of 150 vacated rooms was inspected by the management and this indicated a mean repair cost of rupee 84.30 per room with a standard deviation of rupee 37.20. In constructing a 95% confidence interval for the mean repair cost for all the rooms in the chain, the margin of error will be?

Q: In order to estimate the mean amount of damage sustained by vehicles when a cow is struck, an…

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Q: In a sample of 31 students, the mean scholarship amount received was $802, with a standard deviation…

A: Given Information: Sample size n = 31 Sample mean = $802 Standard deviation = $22.47 Confidence…

Q: The phenol concentration of wastewater was detemined from three (3) parallel determinations, giving…

A: Null hypothesis:   H0: µ=0.520   That is, the mean reference value is not statistically significant.…

Q: In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36.…

A: Solution is given below.

Q: A sample of Alzheimer's patients are tested to assess the amount of time in stage IV sleep. It has…

A: Given that,  Mean, x̄= 45 And standard deviation, s= 11 Sample size, n= 61 Confidence interval for μ…

Q: In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean…

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Q: A group of 78 people enrolled in a weight-loss program that involved adhering to a special diet and…

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Q: From a random sample of 68 businesses, it is found that the mean time that employees spend on…

A: Given dataSample size(n) = 68Sample mean = 4.9 standard deviation = 0.35Significance level(α) =…

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A: Since population standard deviation is unknown, Use t-distribution to find t-critical value. Find…

Q: A study of a local high school tried to determine the mean number of text messages that each student…

A: given that,sample mean, x =200standard deviation, s =66sample size, n =123

Q: Construct a 90% confidence interval for the true average monthly salary earned by all employees of…

A: Given: Average monthly salary  Standard deviation Sample size n = 23 The degrees of freedom can be…

Q: A sample of 15 car owners showed that their average repair bill was $300 with a standard deviation…

A: It is given that sample mean is $300 and standard deviation is $32.

Q: The manager of a fast-food restaurant wishes to estimate the mean waiting time customers spend at…

A: It is given that the sample size is n=56. The sample mean waiting time is x¯=6.35. The sample…

Q: If a sample of 25 fish from my pound has mean weight 157 grams with a standard deviation of 8.3…

A: Given information Sample size(n) = 25 Sample mean = 157g Population standard deviation (σ) = 9.4 g…

Q: In a recent study of 42 eighth graders, the mean number of hours per week that they watched…

A: Mean = 19.6 Standard deviation = 5.8 Sample size n = 42

Q: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: From the given information, there are 19 people with the sample mean is $49 and the sample standard…

Q: Suppose that a manufacturer of laptop batteries claims that his product last more than 950 hours.…

A: Given data : sample size, n = 45 sample mean, x̄ = 925.0 sample standard…

Q: A group of 10 surgery patients had a mean weight of 240 pounds with a sample standard deviation of…

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Q: A study by the department of education of a certain state was trying to determine the mean SAT…

A:

Q: A company that produces white bread is concerned about the amount of sodium in its bread. The…

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Q: The Human Relations Department of Electronics Inc. would like to include a dental plan as part of…

A:

Q: The operations manager of a large production plant would like to estimate the mean amount of time a…

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Q: A sample of Alzheimer's patients are tested to assess the amount of time in stage IV sleep. It has…

A:

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A: It is given that the standard deviation is 40, sample size (n) is 350 and the level of confidence is…

Q: A real estate company appraised the market value of 20 homes in a regional suburb in Western…

A:

Q: A group of students sampled water from 34 lakes in St. Joseph County. If the mean dissolvedoxygen…

A: Given Information Number of goats = 34 Mean = 3.2 Standard deviation = 0.57 90% confidence interval…

Q: A trucking fleet-owner owns two semi-trucks and wishes to compare the amount of fuel used per week…

A:

Q: A marine biologist is interested in whether the Chinook salmon, a particular species of salmon in…

A: Confidence Interval: Confidence interval is the interval estimate of the population parameter. It is…

Q: Suppose that the owner of a recently opened convenience store in Kuala Lumpur, Malaysia, wants to…

A: Given: n=16x¯=75s=6

Q: For a simple random sample of 40 Honda Accords (4 cylinder, 2.4 liter, 5-speedautomatic), the mean…

A: Sample size , n = 40 Mean gas mileage, Standard deviation,

Q: A professional rock climber claims that he can climb a particular mountain within half an hour. From…

A: It is given that n=25, x=30.5 and s=3.9 To test  H0:μ=30H1:μ<30

Q: A sample of 14 commuters in Chicago showed the average of the commuting times was 33.2 minutes. If…

A: Given that x bar =33.2.s.d =8.3,n=14,alpha=.05

Q: A researcher is conducting a study to determine the mean trough dosage of medication for a…

A:

Q: According to a health foundation survey from 2018 and 2016, the average annual premiums for…

A: The provided information is, The confidence level is 97%. Therefore, the level of significance is 1…

Q: In a random sample of seven cell​ phones, the mean full retail price was ​$402.50 and the standard…

A:

Q: On the Stanford-Binet test, the mean IQ is 100. A class of 21 kindergarten pupils were tested with a…

A: Given  population mean μ=100, n=sample size=21, sample mean x̄=92, sample standard deviations s=6.92…

Q: In a controlled and scientifically valid study of sleeping pills, 40 people who took Pill A averaged…

A:

Q: A study by the department of education of a certain state was trying to determine the mean SAT…

A:

Q: The monthly advertising expenditure of the company is normally distributed with a standard deviation…

A:

Q: In a recent sample of 89 used cars sales costs, the sample mean was $6,225 with a standard deviation…

A: Given, Sample size = 89 Sample mean = 6225 Sample standard deviation = 3151   Since the population…

Q: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: The summary of the statistics is, The degree of freedom is, df=n-1   =19-1   =18 Critical value: By…

Q: In a random sample of ten cell phones, the mean full retail price was $554.00 and the standard…

A: Given that Sample size n = 10 Sample mean = 554.00 Sample SD = 167.00 The critical value of t at 95%…

Q: A study by the department of education of a certain state was trying to determine the mean SAT…

A:

Q: Estimate the average number of feathers that a mature tom turkey has with 90% confidence interval by…

A: It is an important part of statistics . It is widely used .

Q: A food snack manufacturer samples 15 bags of pretzels off the assembly line and weighed their…

A: Here, sample mean is x-bar = 10.2, the sample standard deviation is s = 0.25 and sample size n = 15.…

Q: A study of a local high school tried to determine the mean number of text messages that each student…

A:

Q: A recent study of 28 randomly selected employees of a company showed that the mean of distance they…

A:

Q: A study was conducted to estimate hospital costs for car accident victims who wore seat belts.…

A: Using t distribution for calculating confidence interval becauseof unknown population sd.

Q: In a sample of 45 students, the mean scholarship amount received was $854, with a standard deviation…

A:

Q: A sample of 30 Microsoft employees yielded a mean of 44 hours worked per week with a standard…

A: A sample of 30 Microsoft employees are collected. Sample mean number of hours worked per week is 44…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.