According to a recent​ survey, the population distribution of number of years of education for​ self-employed individuals in a certain region has a mean of 13.8 and a standard deviation of 2.7. a. Identify the random variable X whose distribution is described here. b. Find the mean and the standard deviation of the sampling distribution of x for a random sample of size 81. Interpret them. c. Repeat​ (b) for n=324. Describe the effect of increasing n.

Q: (A2) if the standard error of the mean is 10 for N=12, what is the standard error of the mean for…

A: Given (A2): SE=10 for N=12 (A2): SE= 50, for N=25

Q: For a sample of n = 30 scores, a score that is 6 points above the mean has a z-score of z = 1.50.…

A: For a sample of n = 30 scores, a score that is 6 points above the mean has a z-score of z = 1.50.

Q: Experience has shown that the value of orders placed by customers of Handy Glass Pty is normally…

A: From the provided information, Mean (µ) = 200 Standard deviation (σ) = 755 Sample size (n) = 85

Q: A sample of n = 25 scores has a mean of M = 83 and a standard deviation of s = 15. Compute the…

A: number of samples, n = 25 Mean = 83 Standard deviation, s = 15 Now, Standard Error is given by,…

Q: In response to the increasing weights of passengers, in 2003 the Federal Aviation Administration…

A:

Q: A survey of 1000 men ages 20 to 30 found that their heights were normally distributed, with a mean…

A: Solution: Let X be the height of men ages 20 to 30. From the given information, X follows normal…

Q: In a symmetric distribution with HH = 48 and standard deviation o = 3 Approximately what percent of…

A:

Q: In order to set rates, an insurance company is trying to estimate the number of sick days that full…

A: Given :Population standard deviation = 2.8 daysCompany wants to be 95% confident that the true mean…

Q: A marketing researcher for a phone company surveys 176 people and finds that the proportion of…

A: From the provided information, Sample size (n) = 176 Proportion (p) = 0.11

Q: If you want to be 95% confident of estimating the population mean to within a sampling error of ±5…

A: formula for the sample size :

Q: Suppose the weight of all boxes of cereal in a home with children is normally distributed with a…

A: Given that a) Mean = 55, Standard deviation = 9.32, sample size = 8 b) Proportion p = 0.45, sample…

Q: A random sample of 82 eighth grade students' scores on a national mathematics assessment test has a…

A:

Q: For a normally distributed population with a mean of 35 and a standard deviation of 7.5 find P(X <…

A:

Q: A marketing researcher for a phone company surveys 184 people and finds that the proportion of…

A:

Q: According to a college survey, 22% of all students work full time. Find the standard deviation for…

A:

Q: A researcher wishes to determine how much money per week is spent on groceries in a small Western…

A: Given : ME&lt; 3.0 σ= 18.0 At 98.0 % confidence level , z score= 2.326 Need to find the minimum…

Q: b) The American Automobile Association reports that the average time it takes to respond to an…

A: Given  μ=38, σ=9.002 and n=80

Q: The number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below.…

A: 0 0.15 0 0 0 1 0.20 0.2 1 0.2 2 0.30 0.6 4 1.2 3 0.10 0.3 9 0.9 4 0.20 0.8 16 3.2 5 0.05…

Q: A scientist has read that the mean birth weight, μ, of babies born at full term is 7.3 pounds. The…

A: Given that a scientist has read that the mean birth weight, μ, of babies born at full term is 7.3…

Q: . Sheldon owns a mango farm and the weight of his mangoes are normally distributed with an average…

A: here  N = 800 n = 50 μ = 200 gramσ = 15 grams

Q: opulation with a standard deviation of  20, find the z-score for each of the following locations in…

A: The z score can be calculated as: z=x-μσ (a) The z score for Above the mean by 5 points is,…

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: Runzheimer International publishes data on overseas business travel costs. It reports that the…

A: The standard deviation will be obtained as given below:

Q: The weight of an organ in adult males has a​ bell-shaped distribution with a mean of 350 grams and a…

A: The weight of an organ in adult males has a​ bell-shaped distribution with a mean of 350 grams and a…

Q: Mitsubishi which operates and manages car rentals for DMMMSU employees found that the tire lifetime…

A: Given For the first question μ=50000σ=3500   For the second question  μ=50σ=6

Q: In order to set rates, an insurance company is trying to estimate the number of sick days that full…

A: Given Margin of error=1 Standard deviation=3.6 Significance level=0.05

Q: A manager is interested in finding the average number of sales per day at a sporting goods store. If…

A: Obtain the sample size. The sample size is obtained below as follows: The formula of sample size is,…

Q: The Credit Risk Department of a major bank estimates the default rate on loans under $10.000 to be…

A:

Q: Babcock and Marks (2010) review survey data from 2003–2005, and obtained an average of mean = 14…

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

Q: A waitress believes the distribution of her tips has a model that is slightly skewed to the right​,…

A: a) The probability that she will earn at least $350 is obtained below: From the given information,…

Q: Is the difference between the mean annual salaries of registered nurses in State A and State B equal…

A:

Q: Given that X is normally distributed with a mean of 50 and a standard deviation of 4, determine P(45…

A:

Q: The weights of bunches of bananas in the grocery store are Normally distributed with a mean weight…

A: ANSWER: Using the given data,

Q: The average student loan debt for collge graduates is$25,950. Suppose that that distribution is…

A:

Q: he standard deviation of the average, ?¯ : (b) The probability that the average amount of sunscreen…

A: Company sells sunscreen, amount of lotion in tube varies according to normal distribution with mean…

Q: A sign in the elevator of a college library indicates a limit of 16 persons. In addition, there is a…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: he scores on a standardized mathematics test for 8th grade children in New York State for a normal…

A: mean = 70 standard deviation = 10 a. What proportion of the students in the state have scores less…

Q: Q- For a sample of washers produced by a machine is normally distributed with mean inside diameter…

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: According to the 1-2-3 rule, what percentage of area in a normal distribution is within one standard…

A: Normal distribution is symmetric distribution about mean and bell shaped. Spread of the distribution…

Q: an in adult males has a​ bell-shaped distribution with a mean of 350 grams and a standard deviation…

A: As per the empirical rule for normal distribution, 68%, 95% and 99.7% of the values lie within one,…

Q: Engineers must consider the breadths of male heads when designing helmets. The company researchers…

A: Given data: Mean = 5.7 Standard deviation  = 1.2

Q: The population has a mean of 120 and a standard deviation of 12. The sample size of your sampling…

A: The provided information are: Population mean (µ) = 120 Population standard deviation (σ) = 12…

Q: A company sells sunscreen in 500 milliliter (ml) tubes. In fact, the amount of lotion in a tube…

A: (a)

Q: A statistical analysis of a very large sample of fully-assembled medical devices indicates that the…

A:

Q: In order to set rates, an insurance company is trying to estimate the number of sick days that full…

A: Given: Standard deviation, σ = 2.8​​​​​​ True mean differs from the sample mean by one more than one…

Q: A random sample is selected from a population with a standard deviation of 0=18. a. On average,…

A: Given: A random sample is selected from a population with a standard deviation of σ=18

Q: In the field of accountancy, times spent studying by students in the week before professional exams…

A: 1. a)  Probability that sample mean exceeds population mean by more than 2 hours is given by :…

Q: In what range would you expect to find the middle 68% of most head breadths? Between   ? and ?…

A: Given : The company researchers have determined that the population of potential clientele have head…

Q: Is the difference between the mean annual salaries of registered nurses in State A and State B equal…

A: Sample mean (x̅1) = 75,876 Sample mean (x̅2) = 70,876 Sample size (n1) = 30 Sample size (n2) = 25…

Q: "An electrical firm manufactures light bulbs that have a length of life that is approximately…

A: Mean(µ) = 858 Standard deviations (σ) = 54 Sample size (n) = 50 X ~ N (µ, σ )= N ( 858, 54) x̅~ N…

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.