1. In a random sample of 15 CD players brought in form repair, the average repair cost was $80 and the sample standard deviation was $14. Construct a 90% confidence interval for. Assume the repair costs are normally distributed and there are no outliers.

Q: 1) A sample of 532 Peanut Butter M&M's contains 74 yellow candies; write a 95% confidence statement…

A: In this case, the confidence level is 95%. The 95% confidence interval for the proportion/percentage…

Q: 3- Car and Driver Magazine tested a random sample of 9 hybrid cars and found their MPG to be 42, 51,…

A:

Q: Of the following, which is the smallest sample size that will result in a margin of error of 0.1…

A: It is given that Population SD = 1.5 Margin of error E = 0.1 Level of confidence = 99% The critical…

Q: A sample of thirty six (36) observations is taken from a normally distributed population with…

A:

Q: 3) A corporation employs 148 sales representatives. A random sample of 60 of them was taken, and it…

A: The sample proportion is computed as follows,

Q: 9.2 An electrical firm manufactures light bulbs that have a length of life that is approximately…

A:

Q: 1. A recent survey of 50 workers for the starting monthly salary in PKR employed in the construction…

A: The mean is given by   The standard deviation is given by

Q: -. How much do wild mountain lions weigh? Six adult wild mountain lions captured and eleased for the…

A: Solution: x (x-x) (x-x)2 68 -28 784 104 8 64 128 32 1024 122 26 676 80 -16 256 74…

Q: 2. A researcher wants to test if the mean GPAS (grade point averages) of all male and all female…

A: Comment: As per the our company guidelines we are supposed to answer only one question. Kindly…

Q: 1- The Internal Revenue Service is studying contributions to charity. The mean calculated from a…

A:

Q: Given the data from ten (10) randomly selected European females about their foot length. 22.5  24.7…

A:

Q: A random sample of 10 regions in New England gave the following violent crime rates (per million…

A: Given Let X1 and X2 represent  a random sample of 10 regions in New England and 12 regions in the…

Q: The trade union of Sekhukhune University wanted to know the average wage of all workers of the…

A: Given Information: Sample size (n) = 64 Sample mean (x¯) = 22,700  Standard deviation = 3200 To…

Q: In order to estimate the mean debt-to-equity ratio of its loan portfolio, the bank randomly selects…

A: Given sample ratios : 1.04, 1.08, 1.13, 1.18, 1.23, 1.32, 1.41, 1.46, 1.55, 1.57, 1.70, 1.77 Sample…

Q: 6. A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their…

A: The confidence interval measure the range where the true population parameter exist. If the…

Q: 1. Construct a 99% confidence interval for a sample mean of 67.5, sample standard deviation of 8.3…

A: Given x¯=67.5s=8.3n=7

Q: Suppose that we randomly select 50 billing statements from each of the computer databases of the…

A:

Q: 1. A consulting agency was asked by a large insurance company to investigate whether salespersons…

A: Given  n1=sample size 1 =40, n2=sample size 2=45, sample mean 1 x̄1=11, sample mean x̄2=9, s1=sample…

Q: 1. A company manufactures LCD monitors, which have a lifespan that is approximately normally…

A: As per our guidelines we are suppose to answer only one question1)GivenMean(x)=180standard…

Q: A random sample of records of 10 night shifts at the emergency section at the Nairobi hospital gave…

A: A confidence interval for a mean is a range of values that is likely to contain a population mean…

Q: sports in China and those made in America. shop selects a random sample and records the sales of…

A: (a) The SE for the sales from china is calculated as: SEChina=sn=9.7550=1.379 Hence, the SE Mean for…

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A:

Q: What is the smallest sample size required to provide a 95% confidence interval for a mean, if it…

A: Given problem is : What is the smallest sample size required to provide a 95% confidence interval…

Q: Compute the lower limit of the 95% confidence interval for the correlation of .75 (N = 25).

A:

Q: 3) An electrical company manufactures a plastic connector module that have depths that is…

A: Given,sample size(n)=75mean(x¯)=0.310standard deviation(σ)=0.0015α=1-0.95=0.05α2=0.025Z0.025=1.96…

Q: Construct a 95% confidence interval for the population variance σ² if a sample of size 25 has…

A:

Q: Consumers may be interested in whether the cost of a particular calculator varies from store to…

A: Given, Sample size, n = 43 Sample mean,  = 84 Sample standard deviation, s = 12 Population standard…

Q: In order to estimate the mean debt-to-equity ratio of its loan portfolio, the bank randomly selects…

A:

Q: Suppose you observe 62 data points from a distribution with standard deviation 2.1, and you…

A: Given, n=62 data points standard deviation SD= 2.1, calculated a 92% two-sided confidence interval…

Q: A sample of 18 observations taken from a normally distributed population produced the following data…

A:

Q: 4) Consider the following statistics in the mid-season of Spanish La Liga. Sample Variance Mean Ball…

A: Given  n1=14, X1bar=0.7, s1^2=0.2 n2=12,X2bar=0.80, s2^2=0.70 Alpha=0.10

Q: The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and…

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Q: Consider the following samples of n = 5 from a population. Without doing any cal- culations, which…

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Q: Based on a previous study, it is known that the dividend payout ratio of an industry resembles a…

A: Given: An investment manager collects data from 81 companies in an industry. Let n represents the…

Q: b) A random sample of records of 10 night shifts at the emergency section at the Nairobi hospital…

A:

Q: 2. Construct a 90%, 95%, and 99% confidence interval of the mean weight of fresh oranges if 100…

A: Given : Mean , μ = 180 gm Standard deviation, σ = 30 gm sample size, n = 100 a) Confidence Level =…

Q: 11. Mr. Thomas of Wilmer Amina Carter High School (a large urban high school) wants to know what…

A: Given Information: Sample size n=152 students Out of which x=85 support banning plastic water…

Q: A sports shop selects a random sample and records the sales of items made in China and those made in…

A:

Q: 2. Given a random sample with size 39 taken from a normally distributed population or 200 members,…

A: Given : n= 39 x¯=66 σ=11

Q: In a study of academic procrastination, the authors of a paper reported that for a sample of 431…

A:

Q: The cell phone conversations of a random sample of 50 students has a standard deviation of 9.7…

A: Given: n=50σ=9.7CI=90%=0.90

Q: 1. The lifetime of a 75 watts lightbulb is normally distributed with mean µ hours and variance σ2.…

A:

Q: 1) An electronic manufacturer produces lampshades with a life span of approximately normally…

A: Given: standard deviation(σ)=35

Q: Suppose 10 Texas counties are randomly selected to study the average percent of residents who are…

A:

Q: Consider the following statistics in the mid-season of Spanish La Liga. mean ball possession…

A: we have to find 90% confidence interval between mean ball possession here both n < 30 so we will…

Q: Determine the margin of error for the confidence interval for the mean: 23 +1.7 The margin of error…

A: Confidence Interval is an inference process that is used to estimate the population parameter. The…

Q: 1. Construct a 90% confidence interval for the proportion of employees requiring size 3.

A: here given  A civil engineering firm issues every new employee with a safety helmet. Four different…

Q: Consider the following information on years of education:   Mean Standard Deviation N Lower…

A: 1. From the Standard Normal Table, the value of z* for 95% confidence is 1.96. The 95% confidence…

Q: A recent survey of 50 workers for the starting monthly salary in PKR employed in the construction…

A: Note: Hi there! Thank you for posting the question. As your question has more than 3 parts, we have…

Q: Consider the following figures. 8.6  7.1  8.6  8.2  8.8 8.2  7.4  8.5  8.1  8.4 the numerical…

A: Given,sample size(n)=10sample mean(x¯)=8.19stanadard deviation(s)=0.5446degrees of…

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.