A random sample of 100,000 credit sales in a department store showed an average sale of $81.25. From past data, it is known that the standard deviation of the population is $10.00. Determine the standard error of the mean. O 0.0001 O 0.0100 O 0.0316 O 10.00 o o 0o

Q: As a mechanical engineer working for an automobile manufacturer, you conduct a survey and collect…

A: The given values are shown Table 1. The formula to find mean for any sample is, x¯=∑(xf)n (1) Here,…

Q: The proportion of men who smoke cigarettes in the US is 0.23.  A researcher took a sample of 200 men…

A: Sampling Distribution of Proportion: Standard deviation of sampling distribution of sample…

Q: For a normal distribution with a mean of µ = 100 and a standard deviation of σ = 15, what is…

A:

Q: The average cost of tuition, room and board at small private liberal arts colleges is reported to be…

A: We have to find test statistics...

Q: The long-distance calls made by South Africans are normally distributed with a mean of 16.3 minutes…

A: Given,mean(μ)=16.3standard deviation(σ)=4.2

Q: From a normally distributed population, we took a simple random sample of 700 students with a mean…

A: Sample size n=700 Sample mean x¯=640 Population Standard deviation σ=300

Q: In a study of distances traveled by buses before the first major engine failure, a sample of 191…

A: It is given that the sample mean is 96,700 and the sample standard deviation is 37,500.

Q: Which of the following is the correct formula for the margin of error of a population mean where the…

A: Margin of error: A margin of error is a statistical measurement for the diff. between actual and…

Q: For a normal distribution with a mean of μ = 100 and a standard deviation of σ = 15, what is…

A:

Q: The standard deviation of a sample is directly proportional to the square root of its sample size.…

A: We have given the following statement about the standard deviation.

Q: In a two - tailed test, given that the population mean is 40 with a standard deviation of 2.5. A…

A:

Q: Which of the following is the best approximation of the standard deviation of the normal curve shown…

A: which of the following is the best approximation of the standard deviation of the normal curve shown…

Q: For a population with a mean of μ= 50 and a standard  deviation of σ= 10, compute the standard error…

A: For a population with mean µ  and standard deviation σ, the standard error is σM = σ/√n, where M is…

Q: A new extended-life light bulb has an average life of 750 hours, with a standard deviation of 50…

A: As per empirical rule approximately 68-95-99.74% data fall within 1-2and3sd of mean.

Q: The average cost of tuition, room and board at small private liberal arts colleges is reported to be…

A: The test statistic is, The degrees of freedom is,

Q: A firm specializing in the preparation of income tax returns, claims the mean refund for customers…

A: State the hypotheses.

Q: In a study of the tooth-brushing habits of a large number of dental patients, it was observed that…

A: The following information has been given: The population mean is μ=230. The population standard…

Q: For a normal distribution with a mean of μ = 10 and a standard deviation of σ = 2, what is p(5<X<15)

A: It is given that X follows N(mean = 10, SD = 2), then Z = (X - mean)/SD follows N(0,1)

Q: A simple random sample of 5 months of sales data provided the following information: Month: 2. 3. 4.…

A: Given :

Q: The tip percentage at a restaurant has a mean value of 18% and a standard deviation of 6%. What is…

A: Obtain the approximate probability that the sample mean tip percentage for a random sample of 40…

Q: A sample was done, collecting the data below. Calculate the standard deviation, to one decimal…

A:

Q: A used car dealer says that the mean price of a three-year-old sports utility vehicle is $20,000.…

A: a) The claim is that the mean price of a three year old sports utility vehicle is not $20,000. The…

Q: In a random sample of 1000 students, 70% prefer to study at the school campus. The standard error…

A: Solution: Given:   n: size of random sample  = 1000 p: sample proportion          = 0.70…

Q: The daily number of eggs produced by an egg processing machine is normally distributed with a mean…

A:

Q: A previous study claims that the average time a teenager spends browsing his social media accounts…

A:

Q: A USA Today poll asked a random sample of 1012 U.S. adults what they do with the milk in the bowl…

A: Given Data: n=1012 p=0.7

Q: A test has a mean score of 150 and a standard deviation of 12. Scores are normally distributed. What…

A: Let X denote the test score and follows normal distribution with mean of μ=150 and standard…

Q: The symbol oz represents the standard deviation of a sample of size n. True O False

A: Answer : B. False

Q: n a process that manufactures tungsten-coated silicon wafers, the target resistance for a wafer is…

A: As the population standard deviation is not known, we will use t-distribution and perform a t-test.…

Q: In an effort to improve the quality of dining services, the Dean's Office hired an independent firm…

A:

Q: What is the value of k?   What is the standard deviation?

A: Here use basic of discrete probability distribution

Q: The standard deviation of the number of defectives in samples of 200 units taken periodically from…

A:

Q: Suppose a normal distribution has a mean of 50 and a standard deviation of 3. What is P(x≤ 47)? OA.…

A:

Q: Is the standard deviation of the sample a good estimate of the variation of salaries of TV…

A: Sample standard deviation is always an unbiased estimate of population sd.

Q: A coffee shops tracks sales and has observed the distribution in the following table. What is the…

A:

Q: Calculate the standard deviation of the data shown, to two decimal places x 5.9 2.3 8.1 15.3 10.9…

A: The term variance was suggested by Prof.  R. A. Fisher. The arithmetic mean of squares of…

Q: The standard deviation of a sample is inversely proportional to the square root of its sample size.…

A:

Q: A used car dealer says that the mean price of a three-year-old sports utility vehicle is $19,000.…

A: (a) Let μ denotes the population mean price of a three-year-old sports utility vehicle. A used car…

Q: For a population with mean of 50 and standard deviation of 8, what is the raw score that corresponds…

A:

Q: Consider the normal distribution of IQs with a mean of 100 and a standard deviation of 16. What…

A:

Q: The number of pages produced by a fax machine in a busy office is normally distributed with a mean…

A: Normal distribution

Q: Suppose annual salaries for sales associates from Hayley's Heirlooms have a bell-shaped distribution…

A: It is given that the annual salaries are distributed bell shaped (approximately normal) with mean of…

Q: Find the standard deviation of the following data. Round your answer to one decimal place. x 0 1 2…

A:

Q: For a population with a mean of μ= 40 and a standard deviation of σ= 6, find the z-score…

A: From the provided information, Population mean (µ) = 40 Standard deviation (σ) = 6 a) Sample size…

Q: A local university administers a comprehensive examination to the recipients of a B.S. degree in…

A: The sample standard deviation can be calculated as:

Q: What is the z-score of x = 3 if it is 2 standard deviation to the left of the mean? O -3 O -2 O -1 O…

A:

Q: In a certain population, let us assume that high school scores are normally distributed with mean of…

A: Obtain the 75th percentile.   The value of 75th percentile is obtained below as follows:

Q: Which symbol is used for standard deviation of the population? O b. a O c.o o d.o?

A: We have given that,  Which symbol used for standard deviation of the population?  We have to check…

Q: It is reported that a survey had a standard error of the mean of 20, and it is assumed that the…

A: Given information- Population standard deviation (σ) = 500 Standard error of the mean (SE) = 20 We…

Q: In a certain population, let us assume that high school scores are normally distributed with mean of…

A: It's normal distribution with mean=74 And standard deviation=15

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.