It is known from a previous study that in a factory producing steel ropes, the ropes drawn by ropes fit a normal distribution with a standard deviation of 45. At the request of the customer placing an order of 100 boxes, the standard error is intended to be 12, and how many units of sample should be drawn.

Q: A scrap metal dealer claims that the mean of his sales is “no more than $80,” but an Internal…

A: Given that, Mean= 91 Standard deviation, sigma= 21 Sample size, n=20 Hypothesis,  Ho:  the agent’s…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given that, The distribution of the number of phone calls answered each day, Mean = 48 Standard…

Q: when samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: The sample standard deviation (s) is equal to the ratio of standard deviation of the population σ…

Q: In Country A, the population mean height for 10-year-old girls is 53.6 inches with a standard…

A: Null hypothesis: Null hypothesis is the statement about parameter of population. Alternative…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A:

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A: Dear students as per guidelines we answer the first three subparts only when multiple different…

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A: a) The test hypotheses are: Null hypothesis: H0: μ = 700 Alternative hypothesis: H1: μ < 700

Q: An article in American Demographics claims that more than twice as many shoppers are out shopping on…

A: GivenMean(μ)=180standard deviation(σ)=20

Q: A random sample of 17 police officers in Brownsville has a mean annual income of $35,800 and a…

A: Denote μ1, μ2 as the true population mean incomes of police officers for Place B and G,…

Q: In a certain city, the average 20- to 29-year old man is 69.8 inches tall, with a standard deviation…

A:

Q: If families in a sall local community have anal incomes which are oally distributed with a men of…

A: Answer - A normal distribution  with mean μ = $38500  and standard deviation σ = $4800…

Q: A particular manufacturing design requires a shaft with a diameter of 21 000 mm, but shafts with…

A: The mean is 21.002 mm and the standard deviation is 0.006 mm.

Q: A particular manufacturing design requires a shaft with a diameter of 24.000 mm, but shafts with…

A:

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A: Here is given that population mean is 650 Sample mean is 642 and standard deviation is 17   and n is…

Q: A particular manufacturing design requires a shaft with a diameter of 24.000 mm, but shafts with…

A:

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given: μ=58 & σ = 9  Percentage of calls between 25 and 79 can be obtained by the probability…

Q: An article in American Demographics claims that more than twice as many shoppers are out shopping on…

A: Let X be the random variable from normal distribution with mean (μ) = $180 and standard deviation…

Q: A recent report indicates that 2-year-old children from well-educated suburban families watched an…

A: It is given that the mean is 60 and standard deviation is 25.

Q: Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution…

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Q: A community health plan wishes to estimate the mean number of visits per plan participant in a year.…

A: Given that Margin of Error, E = 2 Population SD = 6.3 Level of confidence = 0.95 The critical value…

Q: If the average length measurements for 10,000 pieces of curbstone from a specific laboratory…

A:

Q: The weight of oranges growing in an orchard is normally distributed with a mean weight of 6 oz. and…

A: It is given that the mean is 6 and the standard deviation is 1.5.

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given Information: Mean μ=48 Standard deviation σ=7 Using empirical rule, to find the approximate…

Q: Find the​ back-to-knee lengths separating significant values from those that are not significant.…

A: Let x be the back-to-knee length which follows normal distribution with mean 23.8 and standard…

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A:

Q: At Pacific Freight Lines, bonuses are given to billing clerks when they complete 300 or more freight…

A: Given information Mean µ = 270 Standard deviation σ = 16 proportion of the time should a randomly…

Q: The 2008 General Social Survey asked a large number of people how much time they spent watching TV…

A: According to the given question, The 2008 General Social Survey asked a large number of people how…

Q: A small centre has found that the number of jobs submitted per day to its computers has a…

A: The empirical rule for variables is as follows: 68% of all possible observations lie within one…

Q: As the sample size (n) increases, the standard deviation of x from that sample decreases, this…

A: Hello! As you have posted 3 different questions, we are answering the first question (8). In case…

Q: An industrial company claims that the mean pH level of the water in a nearby river is6.8. You…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: The independent variable is receptionists. The random variable is number of phone calls answered…

Q: Experience has shown that the value of orders placed by customers of Makro is normally distributed,…

A: Given Data Population Mean,μ = 1000 Population Standard Deviation,σ = 150 sample…

Q: A recent study found that 61 children who watched a commercial for potato chips featuring a…

A: Denote μ1, μ2 as the population mean weights of potato chips eaten by children who watched the​…

Q: A set of data items is normally distributed with a mean of 40 and a standard deviation of 8. Convert…

A: Given:  Random variable x follow normal distribution with mean mu=40 ,sd=8  Then z score:…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Solution: Let X be the number of phone calls answered each day by each of the 12 receptionists is…

Q: The daily demand for six-packs of Coke at Mr. D’sfollows a normal distribution, with a mean of 120…

A: Given: Let X be the number of six packs ordered daily. Given: X is normally distributed. Mean of X =…

Q: When samples of size 30 are collected from a normal population that has a mean of 200 and a standard…

A:

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A:

Q: The standard deviation of the base price of a certain type of all-terrain vehicle is equal to $322.

A:

Q: In a certain university, the students were informed that they need a grade in the top 8% of the…

A:

Q: A technical training firm claims that the average time for their trainees to master a particular…

A: Given: The number of students tested every month is n=24. The sample mean time for their trainees to…

Q: If the standard deviation had been larger, the power would have been larger.

A: Here given data of two sample t test   Power of test = 0.752923

Q: When samples of size 25 are collected from a normal population that has a mean of 100 and a standard…

A: Given, n = 25 μ = 100σ = 20       To find, Sampling distribution of standard deviation?

Q: . For this​ process, what is the proportion of shafts with a diameter between 23.991 mm and 24.000…

A: According to the answering guidelines we can answer only three subparts of a question and the rest…

Q: The average grade for an exam is 74, and the standard deviation is 7. If 12% of the class is given…

A: Given: Average=74 Standard deviation=7 z value for 88th percentile z=1.18(consulting the table…

Q: for a population with a standard deviation of 4.2 and mean of 32.5, draw a bell shaped curve,…

A:

Q: A set of data items is normally distributed with a mean of 40 and a standard deviation of 6. Convert…

A: Given set of data is normally distributed with mean = 40Standard deviation = 6The Z score for any…

Q: On their website, a property management company states that the mean monthly rent for apartments on…

A:

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.