83 students are asked in a survey how many hours they work during a week. Their responses have a mean of 19 hours and a standard deviation of 2 hours. Find the margin of error for a 80 % confidence interval. Round your answer in two decimal places

Q: A random sample of  46  four-year-olds attending day care centers provided a yearly tuition average…

A: Solution

Q: The weight of a small Starbucks coffer is normally distributed random variable with a mean of 340…

A:

Q: produce a wider confidence interval for a population mean: a 95% level of confidence or an 85% level…

A: We have to determine which confidence level is wider.

Q: 42% of elderly people have high blood pressure. If a sample of 200 is taken and a success is…

A:

Q: a normal population has a mean of $92 and standard deviation of $11. You select random samples of…

A: Given information: Mean (µ)=92Standard deviation(σ)=11Sample size (n)=50 Find: PX¯-µ≤1.50 Formula: Z…

Q: A random sample of 45 cars in the drive-thru of a popular fast food restaurant revealed an average…

A: given that,population standard deviation, σ =4.89sample mean, x =17.79size (n)=45

Q: You sample 36 families to find out how much they spent on groceries last month. Your sample mean is…

A: Given data,n=36x=540s=82α=0.05

Q: A random sample of shoppers at a convenience store are selected to see how much they spent on that…

A: Standard deviation ,σ = 6.94confidence- level = 0.99So, level of significance = 1-0.99 = 0.01E =…

Q: 61 students are asked in a survey how many hours they work during a week. Their responses have a…

A: The random variable X follows normal distribution. The sample size is 61. The sample mean is 24. The…

Q: The average daily points for my fantasy baseball team are {4.1, 5.7, 3.8, 4.7, 4.7, 5.5, 4.1, 2.7,…

A: Solution: Note: Hello! As you have posted more than 3 sub parts, we are answering the first 3…

Q: When solving a problem related to one sample and the confidence interval of variance. Which table…

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Q: Bundles of firewood are normally distributed with a mean of 20 pounds, and a standard deviation of 2…

A:

Q: ool graduates, and ask them their annual incomes. They give you an average income of $35,000 per…

A: As the population standard deviation is known, we will use z distribution. The value of z at 95%…

Q: You are given the sample mean and the population standard deviation. Use this information to…

A: Mean()=108.78standard deviation()=10.26sample size(n)=36

Q: Safeway puts out hundreds of turkeys in the weeks before Thanksgiving each year. Each weight varies…

A: given data  μ = 15σ = 1.4Z = 1.2; x = ?

Q: A set of exam scores is normally distributed and has a mean of 79.3 and a standard deviation of 7.4.…

A: Given datanormal distribution μ=79.3σ=7.4choose a random score less than or equal to this 0.0078we…

Q: We asked 101 people to report the number of cars they've ever owned. The results are a mean of 4 and…

A: Given data,n=101x=4σ=1z-value at 90% confidence is Zc=1.645

Q: You measure 27 dogs' weights, and find they have a mean weight of 63 ounces. Assume the population…

A: The sample size, i.e., the no. of measured dogs, .The sample average weight (in ounces) of dogs,…

Q: 3. A sociologist is studying marriage customs in a rural community in Denmark. A random sample of 35…

A: From the provided information, Standard deviation (s) = 2.3 Confidence level = 95% Margin of error…

Q: Thirty randomly selected students took the calculus final. If the sample mean was 74.2 and the…

A: From the provided information, Sample size (n) = 30 Sample mean (x̅) = 74.2 Standard deviation (s) =…

Q: Thirty randomly selected students took the calculus final. If the sample mean was 95 and the…

A: From the provided information,

Q: Construct a confidence interval of the population proportion at the given level of confidence. X =…

A:

Q: You would like to construct a 99% confidence interval to estimate the population mean score on a…

A: Solution: Let X be the score. From the given information, x-bar=485 and S=70. Here, it needed to…

Q: You measure 37 dogs' weights, and find they have a mean weight of 35 ounces. Assume the population…

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Q: a) Calculate the z-score for Roberto's test grade. b) Calculate the z-score for Derek's test grade.…

A: For art history, mean = 77 and SD = 9.6 For English, mean = 66.9 and SD = 10

Q: A doctor is researching the effects of "too much text messaging" on a group of teenagers. He has…

A: It is given that the mean is 312 and standard deviation is 125.

Q: A mechanic sells a brand of automobile tire that has a life expectancy that is normally​…

A: Given data is Mean(μ)=26000standard deviation(σ)=2100

Q: Solve the following problem and show your complete solutions. Explain your answer for better…

A: The length of time that a phone will work before it needs charging is normally distributed with mean…

Q: The population standard deviation for number of hours of sleep that people get per night is 1.3…

A: A) The population standard deviation is 1.3 hours.

Q: Actuary Exams A survey of 35 individuals who passed the seven exams and obtained the rank of Fellow…

A: From the provided information,Confidence level = 95%

Q: Salaries for teachers in a particular elementary school district are normally distributed with a…

A: Given information- Population mean, µ = $45,000 Population standard deviation, σ = $6,200 Sample…

Q: /hat is the 95% confidence interval for this sample mean? to 82.0 to 67.4 to 82.9 to 67.6

A: As the population standard deviation is known, we will use z distribution. The critical value z at…

Q: Social Networking Sites A recent survey of social networking sites has a mean of million visitors…

A: Number of social networking sites =6Mean=13Standard deviation = 3.2The confidence interval formula…

Q: Legs for a wooden dining room table are produced by a computer numerically controlled (CNC) Iathe.…

A: Suppose a random variable x, defines the lifetimes of cutting blade.

Q: The length of time, L hours, that a phone will work before it needs charging is normally distributed…

A: The length of time that a phone will work before it needs charging is normally distributed with  Let…

Q: There is a population of test scores. You take a sample of 11 scores and use them to estimate the…

A: From the given information, Sample size (n) =11 Assuming population is normally distributed with…

Q: Regardless of the kind of workout a gym goer does, the mean time spent on the treadmill is 45…

A: Given,sample size(n)=36mean(μ)=45standard deviation(σ)=15

Q: A statistics practitioner took a random sample of 54 observations from a population whose standard…

A: Given,sample size(n)=54sample mean(x¯)=109population standard deviation(σ)=32

Q: Assume that the population has a normal distribution. Thirty randomly selected students took the…

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Q: A particular fruit's weights are normally distributed, with a mean of 641 grams and a standard…

A: Suppose a random variable x defines the weight of a randomly selected fruit.

Q: ???

A: The objective of the question is to understand the concepts of null hypothesis, alternative…

Q: A student randomly selects 10 paperbacks at a store. The sample standard deviation is $1.50.…

A: Solution To find confidence interval we will use chi square distribution.

Q: you take a sample in equal 25 of test scores from a population. The sample mean is 38, and the…

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Q: Use the confidence interval to find the margin of error and the sample mean.   (.364,0.500)

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Q: Time to Complete Final Exam. The time needed to complete a final examination in a particular college…

A: Let X be the time needed to complete a final examination. It is given that X follows a normal…

Q: ou are given the smaple mean and the population m standard deviation. Use this info to construct the…

A:

Q: You measure 33 textbooks' weights, and find they have a mean weight of 70 ounces. Assume the…

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Q: You are given the sample mean and the population standard deviation. Use this information to…

A: Since we know population standard deviation, Use z-distribution to find z-critical value.…

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.