A quality control manager takes an SRS of 500 phone batteries from factory A, where 5% of the batteries have a defect. the manager also takes an independent SRS of 250 batteries from factory B, where 9% of proportions of the batteries have a defect. The manager will then look at the difference (B-A) between the proportions of defective batteries in each sample. What are the mean and standard deviation of the sampling distribution of the difference in sample proportions?

Q: The internal auditing staff of a local manufacturing company performs a sample audit each quarter to…

A:

Q: In a large high school, 18% of sophomores and 67% of seniors have part-time jobs. Suppose random…

A: Solution: Given information: n1= 32 Sample size of sophomores n2= 31  Sample size of seniors…

Q: A study, which randomly surveyed 3,700 households and drew on this information from the IRS, found…

A: A​ study, which randomly surveyed 3,700 households and drew on this information from the​ IRS, found…

Q: In testing for the equality of two population variances, when the populations are  normally…

A:

Q: calculate the standard error of the sampling distribution of the sample statistic

A: Let S.E denote Standard Error. Let sample mean be the sample statistic.

Q: An automobile club comes to the aid of stranded motorists who are members. Over the long run, about…

A: Consider that p is population proportion of them who will utilize the service in the coming 12-month…

Q: Identify the sampling techniques used, and discuss potential sources of bias (if any). Explain.…

A: Given Information: Every tenth person entering a cafeteria is asked to choose his or her favourite…

Q: 3. A study conducted by the Center for Disease Control that asked 15,000 students about their sleep…

A: The number of students are n=15000. The proportion of high school students who do not get 8 hours of…

Q: The owner of a large equipment rental company wants to make a rather quick estimate of the average…

A: The formula for 99% confidence interval to estimate the average number of days that a ditch-digger…

Q: To determine whether a sample should be treated as a simple random sample, which is more important:…

A:

Q: 5. How is the sampling distribution of the statistic x displayed?

A: We have to show how the sampling distribution of chi square displayed.

Q: Of what relevance is the central limit theorem to the sampling distribution of the sample means?

A: Central Limit theorem:

Q: If a random sample of size 36 is obtained from a population with mean u=50 , and standard deviation…

A: Given,   Mean = 50 Standard deviation = 24 Sample size = 36

Q: Which one has samples that are the smallest sample size?

A: Given, 3 sampling distributions in the question comes from samples with the same population mean and…

Q: An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for…

A: Given, The cost of repair for each of the four crashes is, {410, 452, 401, 217} Here min value=217…

Q: In a random sample of 765 adults in the United States, 322 say they could not cover a $400…

A: a) Here population under consideration is adults in United States who cover $400 unexpected expense…

Q: As part of its freshman orientation process, a college gives a math placement exam to incoming…

A: Step-by-step procedure to obtain the test statistic using Ti83 calculator. Press STAT. Select Edit.…

Q: A sample size n = 5 is drawn from a set 10, 14, 23, 31, and 34 without replacement. Construct the…

A: The random variable X follows normal distribution. We have to find the mean, variance, and the…

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: Let p denotes the population proportion of driver fatalities related to alcohol. The test is that…

Q: A population is divided into several clusters and it has been found that all the items within a…

A: According to the provided information, a population is divided into clusters and it is found that…

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A:

Q: How do you compute for the variance and standard deviation of the sampling distribution of sample…

A: Central Limit Theorem for mean: If a random sample of size n is taken from a population having mean…

Q: - Compute the mean, variance and standard deviation of the sampling distribution of the sample mean…

A:

Q: To investigate the relationship between mean job tenure in years among workers who have a bachelor’s…

A: Let workers with bachelor’s degree be the first sample and the workers with no degree be the second…

Q: should their sample size be?

A: here use solvin's formula

Q: At a large corporation, 6,000 employees from department A and 4,000 employees from department B are…

A: Concept of sampling distribution of sample proportion: Let a particular characteristic of a…

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: Given : p = 0.77 x = 14 n = 28 p^ = xn    = 1428    = 0.5

Q: In a large high school, 18% of sophomores and 67% of seniors have part-time jobs. Suppose random…

A: not approximately Normal because the expected numbers of successes and failures for the sophomores…

Q: 36. With simple random sampling, is X an unbiased estimate of u2 If not, what is the bias?

A: Check whether sample mean square is an unbiased estimator of population mean square or not.Unbiased…

Q: At a large corporation, 6,000 employees from department A and 4,000 employees from department B are…

A: Concept of sampling distribution of sample proportion: Let a particular characteristic of a…

Q: What does the sampling distribution of the mean allows determining?

A: Concept of sampling distribution of sample mean: Let a particular characteristic of a population is…

Q: 2. A potato-chip producer and its main supplier agree that each shipment of potatoes must meet…

A:

Q: Find the range, variance, and standard deviation for the given sample data, if possible. If the…

A: Given data is1,2,2,2,4,2,3,2,2,2,2,3,2,2,2,2,2,2,2,2Arrange the data in ascending…

Q: What is the target sample size for a population of 3,500 people with a standard value of 1.65 and a…

A: Solution-; Given: N=3500, Standard value (V)=1.65,sampleing error (Se)=0.10 We find the target…

Q: what is a sampling error?

A: Description of parameter and statistic:A characteristic that describes population is called a…

Q: What is the acronym used for simple random sampling without replacement?

A: In this case, we need to find acronym used for simple random sampling without replacement.

Q: 38. Astudy showed that a group of professional players can score 26 points on average in a single…

A: Solution

Q: 9. What method of sampling where all elements of the population are given equal chance of being…

A: Simple random sampling : Simple random sampling is a kind of a probability sampling in which analyst…

Q: Which of the following are sources of sampling error and which are sources of nonsampling error?

A: Sampling errors are the errors that are arises due to fact that samples are taken to infer the…

Q: Two schools are investigating whether there is a difference in the proportion of students who attend…

A:

Q: What is the best estimate for the standard error of the sampling

A: Given data,Tota no of students n=14795Who said yes for cyberbullied is x=2219Point estimate is…

Q: The president of Doerman Distributors, Inc. believes that 30% of the firm’s orders come from…

A: The given information is:

Q: Suppose that a certain chromosone defect occurs in 12% of all sheep. A random sample of 200 sheep is…

A: Given: Population proportion (p) = 0.12 Sample size (n) = 200

Q: Aspen trees tend to be smaller in the highlands of the park because they are subject to strong…

A: Systematic Sampling will be used here.

Q: 4. What would the sampling distribution of this estimator be? Why?

A: Sampling Distribution: Suppose Y -  y1, y2, y3,.... yn is the random sample of size n from an…

Q: A researcher was interested in the mean wait time in South Carolina emergency rooms. 3 emergency…

A:

Q: Identify the appropriate test-statistic and look for the rejection region of the following situation

A: Given, Sample mean=27.3 Sample S.D=4.1 Population mean=28 n=80

Q: A transportation researcher is funded to estimate the proportion of automobile tires with an unsafe…

A: Solution: a) The population of interest is all cars in the state. b) The sampling frame will be…

Q: Three random samples of sizes, 30, 48, and 32, respectively, are collected, and the three-sample…

A: It is given that there are three random variables and has three sample sizes defined as: n1-30 n2=48…

Average

In mathematics, everyone must have heard the term average in one place or other. Almost all types of calculation require taking out an average. In everyday life, the term is used for denoting a certain amount that can be said to be a typical quantity for multiple people or objects. In other words, if a group of people possesses a certain object, then the average gives us an idea regarding the quantity of the object possessed by each person. However, this is solely based on mathematical calculation. It is important to note that most people will not strictly have the average value in a group.