1. A random sample of 12 kindergarten students yielded a mean weight of 26kg with sample standard deviation of 4.5 kg. Construct a 99% confidence interval for the mean weight of all kindergarten students.
Q: or the original sample n= 500 Atlanta commute times has a mean of x= 29.11. The standard error from…
A: Given data, n=500 Mean x=29.11 standard error is =0.917 find 90%, 95%, and 99% confidence intervals…
Q: 10 individuals are chosen at random from a normal population whose variance is 12 and their weights…
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Q: mpound and has built 16 tires and tested them to end-of-life in a road test. The sample san and…
A: Given n=16 Xbar=60139.7 S=3645.94 C=95%
Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…
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Q: From a random sample of 49 high school seniors, the sample mean and standard deviation of the math…
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Q: 2) A random sample of 56 fluorescent light bulbs has a mean life of 645 hours. Assume the population…
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Q: You randomly select 20 cars of the same model that were sold at a car dealership and determine the…
A: Answer:- Given, Sample size, n = 20 Sample mean, X¯= 9.75 Sample standard deviation, S = 2.39…
Q: fitness of 514 adults (aged 25 to 35) were sampled and their heart rates measured immediately after…
A: Given that Sample size n =514 Sample mean=1427 Population standard deviation =325
Q: The random sample is 100 students 16 to 22 years old. The mean of hours they sleep is 8.9 hrs and…
A: Given,sample size(n)=100mean(μ)=8.9standard deviation(s)=2.2α=1-0.95=0.05α2=0.025degrees of…
Q: 3.) The percentage of metal alloy used in metal casting is measured in 41 random selected parts. The…
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Q: In a research study a group of 10 students were asked to count the number of birds they saw in a…
A: Let the number of birds seen by students.Data: Xi1029510194931069287104105To determine the CI for…
Q: 3. A manufacturer of electronics will not accept a shipment of parts from a vendor if there is…
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Q: Noise levels in a hospital were measured at 81 different locations. The average level was found to…
A: It is given that, Sample mean = 61.2 decibels. Sample standard deviation, s is 7.9 decibels. The…
Q: 4. Assume that 66 % of single women and 81.9% of single men own cars. Also assume that these…
A: From the provided information,
Q: In a random sample of 12 people, the mean commute time to work was 30 minutes and the sample…
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Q: A researcher is interested in estimating the mean length of walleye in a lake with a 95% confidence…
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Q: In a random sample of 29 people, the mean commute time to work was 31.5 minutes and the standard…
A: Given: Sample Size(n)=29 Mean(X¯)=31.5 Standard Deviation (S)=7.3
Q: The mean score of a random sample of 22 student applicants who took the collegeentrance examination…
A: Given,sample size(n)=22sample mean(x)=76.9standard deviation(σ)=27.4α=1-0.99=0.01α2=0.005z0.005=2.58
Q: In a random sample of 100 male students the average height is 68.2 with standard deviation 2.5 .…
A: The summary of statistics is, x¯=68.2,s=2.5,n=100 The degree of freedom is, df=n-1 =100-1 =99…
Q: 17) A random sample of 117 full-grown lobsters had a mean weight of 23 ounces. Assume that o = 3.4…
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Q: A recent GSS reported that the 600 females had a mean of 7.5 close friends (a=8,4) and the 575 male…
A: The null and alternative hypotheses are The test statistic is given by p-value = 0.0131…
Q: A random sample of n = 100 frames of 100mm x 50mm was selected from a consignment of 500 frames.…
A: 1). The sample mean is given as 106 mm. The sample standard deviation is 3.5 mm. The sample size, n…
Q: 3. A sample of 8 adult elephants had an average weight of 12,300 pounds. The standard deviation for…
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Q: 4. A sociologist discovered that an average of 7.2 jobs was held by 50 retired men during the course…
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Q: sample of size 12 drawn from a normally distributed population has a sample mean 38.7 and a sample…
A: We have given that Sample size n =12 Sample mean = 38.7 sample standard deviation =14.9. 99.9%…
Q: Construct the 95% confidence interval for the weights of adults in the town of Metaluna. A simple…
A: Given information- Sample size, n = 39 Sample mean, x-bar = 155 pounds Sample standard deviation, σ…
Q: A random sample of newborn baby boys were weighed. x = 6.7 lb s = 1.3 lb n = 79 1. What is the point…
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Q: In a random sample of 21 people, the mean commute time to work was 33.9 minutes and the standard…
A: Here, mean is 33.9 minutes, standard deviation is 7.1 minutes, and n = 21.
Q: In a random sample of 28 people, the mean commute time to work was 33.3 minutes and the standard…
A: Suppose µ is the population mean commute time to work.
Q: 4. A sociologist discovered that an average of 7.2 jobs was held by 50 retired men during the course…
A: Sample mean x̄=7.2,n=sample size=50, population standard deviations σ=2.1 Construct 95% CI for…
Q: 1. The strength of a fiber is normally distributed with a known population standard deviation of 12…
A: Here since the population standard deviation is given we use the Z value for the computation of…
Q: The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain…
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Q: 4) a. A group of hospitals identified that they receive an average of (9840) Covid-patients per day.…
A: Note: Please repost 2nd question as i can author only one question as per my policy.
Q: 2) Construct a 93% confidence interval for the population mean, μ. Assume the population has a…
A: Given that, x=22.4,s=3.8,n=19 Degree of freedom= n-1 = 19-1…
Q: Suppose average pizza delivery times are normally distributed with an unknown population mean and a…
A: The provided information is:
Q: 3. Another engineer studies the strength of cables, which has a known population standard deviation…
A: Here we need to obtain the minimum sample size required to obtain a 97% confidence interval.
Q: 1a) Work Time Lost due to Accidents At a large company, the Director of Research found that the…
A: Since your question has multiple sub-parts, we will solve first three sub-parts for you. If you want…
Q: Q.3/ Assume that the following five numbers are sampled from a normal distribution: 2, 3. 5, 6 and 9…
A: Solution: x (x-x) (x-x)2 2 -3 9 3 -2 4 5 0 0 6 1 1 9 4 16 n= 5 Sample size ∑x=…
Q: has a mean life of 480 hours, construct a 99% confidence interval for the mean of the flashlights…
A: here population standard deviation = 35 sample size = 150 sample mean = 480 and Z-critical for…
Q: In a random sample of 50 male students the average height is 68.2 with standard deviation 2.5 .…
A:
Q: for the number of words typed per minute, Find: a. 93% confidence interval for the average number of…
A: Sample size=n=12 df=n-1= 11 Sample mean = x ¯ = 79.3 words per minute Standard deviation =s= 7.8…
Q: 1. Suppose that 100 samples of water from a fresh water lake are taken and the calcium concentration…
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Q: In a random sample of 19 people, the mean commute time to work was 33.6 minutes and the standard…
A: Givensample size(n)=19Mean(x)=33.6standard deviation(σ)=7.3Degrees of…
Q: A random sample of 50 students in Holy Angel University shows that they spend an average of 3 hours…
A:
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- The sample mean and standard deviation for weights of 100 boxes are 12.05g and 0.1g respectively. Find a 90% confidence interval for the mean weight of the boxes.6. You randomly select and weigh 27 samples of an allergy medication. The sample standard deviation is 1.22 milligrams. Assuming the weights are normally distributed, construct 90% confidence intervals for the population variance and standard deviation. Please interpret your result.A random sample of 100 components is drawn from a population size of 1546. Assume that the population standard deviation is 2.93 mm and the mean measurement of the components in the sample is 67.45mm with. Determine the 95% confidence intervals for an estimate of the mean of the population.
- 4. A fire extinguisher salesman would like to estimate the mean number of home fires started by candles each year. He obtained fire data for seven randomly selected years from the National Fire Protection Agency. His sample produced a mean of 7041 fires with a standard deviation of 1600. Create the 90% confidence interval of interest.Estimate the average number of feathers that a mature tom turkey has with 90% confidence interval by using a sample of 32 turkeys that had a mean of 3450 feathers and a standard deviation of 25 feathers.14.) A researcher would like to estimate the mean weight of all adult female American alligators in the Everglades. The mean weight of a random sample of 146 adult female American alligators from the Everglades was found to be 217 pounds. The standard deviation of the weights of all adult female American alligators in the Everglades is known to be 16 pounds.Using a 96% confidence level, determine the margin of error, EE, and a confidence interval for the mean weight of all adult female American alligators in the Everglades. Report the confidence interval using interval notation. Round solutions to two decimal places, if necessary.The margin of error is given by E= ___A 96% confidence interval is given by ___
- 1- A researcher makes a research about the life time of batteries which have a normal distribution. In order to understand the life time of batteries s/he randomly selected 49 batteries and calculate the sample mean as 48 hours and standard deviation of 5 hours. Construct 90 % confidence interval for the true population mean of life time of batteries.2. There was a sample of 14 adult wild mountain lions who were caught and released in the San Andres Mountains. The average weight of the sample was 82.55 pounds with a sample standard deviation of 13.45 pounds. Find a 95% confidence interval for the population mean weight of all the wild mountain lions in the San Andres Mountains.4) a. A group of doctors on a particular hospital identified that they attend an average of (15 + 18) patients per hour. Assume the standard deviation is 4. 18 random sample of 36 hours was chosen. Find the 95% confidence interval. b. Find the 90% confidence interval for the variance if a study of (9 + 18) students found the 6.5 years as standard deviation of their ages. Assume the variable is normally distributed.
- The statical skills level of students at a particular university has an unknown mean and known standard deviation of 10. A simple random sample of 100 students from this university is found to have the sample mean statistical skill of 100. Estimate the mean with 90%,95%, and 99% confidence intervals?A sample of 120 students yielded a sample mean GPA of 3.35, end a sample standard deviation equal to 0.28. Calculate the 95% confidence interval for the population mean GPA.• Example: A sample of 25 physically and mentally healthy males participated in a sleep experiment in which the percentage of each participant's total sleeping time spent in a certain stage of sleep was recorded. • The variance computed from the sample data was 2.25. Construct 95 percent confidence intervals for o².
