Twelve randomly selected mature citrus trees of one variety have a mean height of 13.8 feet with a stan-dard deviation of 1.2 feet, and 15 randomly selected mature citrus trees of another variety have a meanheight of 12.9 feet with a standard deviation of 1.5feet. Assuming that the random samples were selected from normal populations with equal variances, con-struct a 95% confidence interval for the difference between the true average heights of the two kinds of cit-rus trees.

Q: Some manufacturers claim that non-hybrid sedan cars have a lower mean miles-per-gallon (mpg) than…

A: As, let the population 1 denote non - hybrids and population 2 denotes hybrids, the answer for test…

Q: A student researcher compares the heights of American students and non-American students from the…

A: American students:Sample size Sample mean Sample standard deviation Non-American students:Sample…

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: In question 2 a 90% confidence interval was computed based on a sample of 250 adults. If the level…

A:

Q: Is there a difference in mean daily consumption of coffee between males and females? A random sample…

A:

Q: mean lung capacity for nonsmoking males in the population aged 50 is 2.2 liters. an investigator…

A: Given that  The mean lung capacity for nonsmoking males in the population aged 50 is 2.2 liters =…

Q: A sample of only 8 adult rhinos had an average weight of 2,500 pounds. The standard deviation for…

A:

Q: In a random sample of 23 private school teachers in queens county the average teaching experience is…

A:

Q: random sample of 26 checking accounts at a bank showed an average daily balance of $300 and a…

A: Sample size n = 26

Q: A random sample of 180 adults male wolves from the Canadian Northwest Territories gave an average…

A: From the provided information, n1=180x1=98s1=6.5n2=85x2=90s2=7.3 Confidence level = 91%

Q: A sample of 24 randomly selected commuters in Chicago showed the average of the commuting times was…

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Q: The manager of a computer retails store is concerned that his suppliers have been giving him laptop…

A:

Q: A random sample of 12 chemists from Washington stats shows an average salary of $39,420 with a…

A: The sample mean one (Washington): x¯1=$39,420, sample mean two (New Mexico): x¯2=$30,215, population…

Q: Some manufacturers claim that non-hybrid sedan cars have a lower mean miles-per-gallon (mpg) than…

A: Given that, Some manufacturers claim that non-hybrid sedan cars have a lower mean miles-per-gallon…

Q: mi/gallon. A simple random sample of 49 cars of this model is chosen and found to have a mean gas…

A: It is given that  Sample mean = 27.5 Population standard deviation = 4 Sample size = 49

Q: The manufacturer of an electrical fuse claims that the fuse's link will break with a 10% electrical…

A: The provided information are:

Q: sample standard deviation of $74.50. a. Develop a  95% confidence interval estimate of the mean…

A: The sample size, i.e., the sampled number of families, n=64.The sample average spent amount(in $)…

Q: The average length of time it takes to read a book can differ from one generation to another.…

A: Population standard deviation ()= 2.2population mean ()= 17sample mean  = 16.1sample size (n) = 50It…

Q: major television manufacturer has determined that its 40-inch LED televisions have a mean service…

A:

Q: A random sample of 800 credit-card holders shows that the mean annual credit-card debt for…

A: Given information:  A random sample of n = 800 credit card holders was taken. The sample mean annual…

Q: Mechanical Engineering

A: Where, n is the sample size E is the margin of error σ is the standard deviation

Q: The tensile strength of type I thread is approximately normally distributed with standard deviation…

A: Given that  X1¯=72.8X2¯=64.4σ1=6.8 σ2=6.8n1=20n2=25

Q: The manager of a computer retails store is concerned that his suppliers have been giving him laptop…

A: Solution: Let X be the replace times for the model laptop of concern. From the given information, X…

Q: A survey found that​ women's heights are normally distributed with mean 62.2in. and standard…

A: Men mean =67.7 s = 3.5

Q: The head of the quality department of a battery factory needs to estimate the average lifetime of a…

A: Here we have been provided with population standard deviation , σ = 100 hours sample size , n = 64…

Q: 8 holes drilled on a lathe were measured and its variance was found to be 2.81 cm. What is the…

A: Given: s2=2.81n=8 The degrees of freedom is obtained as below: df=n-1=8-1=7 The critical value is…

Q: The amount of time it takes students to travel to school can vary greatly depending on how far a…

A:

Q: A cheese maker sells cheese in wheels that are known to have a standard deviation of 1.9ounces. If a…

A:

Q: A random sample of 550 credit-card holders shows that the mean annual credit-card debt for…

A: Given information   Sample size (n) = 550 Mean x̅  = $8220 Standard deviation (s) = $1102…

Q: A sample of 20 body temperatures resulted in a mean of 98.3° and a standard deviation of .24°. Use…

A: From the provided information, Sample size (n) = 20 Mean (x̄) = 98.3 Standard deviation (s) = 0.24…

Q: The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain…

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Q: le of 16 ten-year-old girls had a mean weight of 71.5 and a standard deviation of 12 pounds,…

A: Confidence interval: It is defined as the range that contains the value of the true population…

Q: The mean BMI in patients free of diabetes has been reported as 27.8. An investigator measured BMI in…

A:

Q: An SRS of 23 students at TSU gave an average height of 5.6 feet and a standard deviation of .1 feet.…

A:

Q: In a study by WebCriteria, it took an average of 2.1 minutes to locate information and buy products…

A: Given Information : In a study by Web Criteria, it took an average of 2.1 minutes to locate…

Q: The mean number of English courses taken in a two-year time period by male and female college…

A:

Q: A study revealed that the average time for a university graduate to find a job was 7.4 months, with…

A: It is given that, A study revealed that the average time for a university graduate to find a job was…

Q: A sample of 30 randomly selected patients in a waiting room at a doctor’s office reported a mean…

A: Solution: Given information: n= 30 Sample size  x= 38.5 minutes  Sample mean σ= 1.78 minutes…

Q: The gas mileage for a certain model of car is known to have a standard deviation of 6 mi/gallon. A…

A:

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.