A random sample of 25 college males was obtained and each was asked to report their actual height and what they wished as their ideal height. A 95% confidence interval for _µ_d = average difference between their ideal and actual heights was 0.8" to 2.2". Based on this interval, which one of the null hypotheses below (versus a two-sided alternative) can be rejected? Select one: a. H0: µd = 2.0 b. H0: µd = 1.0 c. H0: µd = 1.5 d. H0: µd = 0.5

Q: A recent survey of 200 households showed that 8 had a single male as the head of the household.…

A: It is given that n1=200, x1=8, n2 =200 and x2=6.

Q: A sample of 10 cam shafts intended for use in gasoline engines has an average eccentricity of 1.02…

A:

Q: It is known that the standard deviation of the amount of time it takes a person to shower is 8.3…

A:

Q: A survey conducted by the American Automobile Association showed that a family of four spends an…

A:

Q: A group of scientists studied the adhesion of various biofilms to solid surfaces for possible use in…

A: The confidence interval to be no wider than 0.55 dyne-cm2 at 90% confidence interval. The margin of…

Q: A group of scientists studied the adhesion of various biofilms to solid surfaces for possible use in…

A: The critical value 98% confidence level from the standard normal table (as standard deviation is…

Q: A personnel manager has found that, historically, the scores on aptitude tests given to applicants…

A: Given: σ=25.6, n=12 and x=69.86. Now, use upper limit of the confidence interval to find the value…

Q: A random sample of 100 households was selected as part of a study on electricity usage, and the…

A: The average usage was 10.5, the standard deviation of usage is 3.2, and the sample size is 100.…

Q: An article reports that the average initial rate of absorption (in g/min·cm2) for a sample of five…

A: Solution: From the given information, x-bar is 4500.8 and Sx=271.6, y-bar is 1299.8, Sy=329.8, nx=5…

Q: The average blood glucose level of a large population was found to be 130 mg/dl or greater than…

A: Consider that μ defines the true average blood glucose level of a large population.

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A: Solution : Given data is Population Mean (μ) =50000 Sample Standard Deviation (s) = 8000 Sample Size…

Q: In a study of an Oil field, 100 permeability measurements have been used and resulted in a normal…

A: Level of significance: The level of significance or α is the probability of rejecting H0 when, in…

Q: A survey conducted by the American Automobile Association (AAA) showed that a family of four spends…

A: Given that: Population mean, μ=215.60 n = 64 x¯=252.45 s = 74.50

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

A:

Q: A random sample of 100 households was selected as part of a study on electricity usage, and the…

A:

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A: Given information Population mean µ = 50000 Sample size n = 30 Sample mean x̅ = 43500 Standard…

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A: Here we conduct Z test for mean.

Q: A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older…

A: Solution : Given that, mean = 96.3 min s = 23.9 min n = 19

Q: A survey of nonprofit organizations showed that online fundraising has increased in the past year.…

A: From the given information, Sample size n =50 Sample mean, x̅=$31. Sample standard deviation, s=$7…

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A:

Q: While performing a strenuous task, the pulse rate of 25 workers increased on the average by 18.4…

A: Given, n = 25 X = 18.4S = 4.9α = 0.05The hypothesis is :H0: μ = 30VsHa:μ <30

Q: A group of scientists studied the adhesion of various biofilms to solid surfaces for possible use in…

A: Express the formula for the confidence interval. C.I=X¯±Zσn Here, X¯ is the mean, σ is the standard…

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A:

Q: A random sample of 1,584 people that work in a particular high-rise building are normally dis…

A: The confidence interval formula is, CI=x¯±zα2σn In the formula, x¯ be the mean, σ be the population…

Q: In a study of morphological variation in natural populations of fruit fly, it was reported that the…

A:

Q: The concentration of carbon monoxide (CO) in a gas sample is measured by a spectrophotometer and…

A: The concentration of carbon monoxide in a sample is 85ppm and uncertainty is 8ppm. From Table of the…

Q: In a study of an Oil field, 100 permeability measurements have been usedand resulted in a normal…

A: Level of significance: The level of significance or α is the probability of rejecting H0 when, in…

Q: A sample of 49 measurements of tensile strength for roof hangers are calculated to have a mean of…

A:

Q: The capacities in amp/hrs were measured for a sample of 120 batteries. The average was 178 and the…

A:

Q: The life span of a 30-watt LED light is known to be normally distributed with o = 20 hours. A random…

A: Given that, the life span of a 30-watt LED light is known to be normally distributed with standard…

Q: A researcher wishes to estimate the average blood alcohol concentration​ (BAC) for drivers involved…

A:

Q: A sample of 11 circuits from a large normal population has a mean resistance of 2.20 ohms. We know…

A: Given Information: Sample size n=11 Sample mean x¯=2.20 Population standard deviation σ=0.35 To…

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A: Given information Population mean µ = 50000 Sample size n = 21 Sample mean x̅ = 46500 Standard…

Q: The life span of a 30-watt LED light is known to be normally distributed with a = 20 hours. A random…

A: Given : σ=20n = 20x = 1020 Confidence level = 0.90

Q: To assess the accuracy of al laboratory scale, a standard weight that Is known to weigh 1 gram is…

A:

Q: The heights of seasonal pine saplings are normally distributed with a population standard deviation…

A: The error bound is obtained below:

Q: A company manufacturing stereo equipment claims that their personal CD player can be used for…

A:

Q: The manufacturer of a particular brand of tires claims they average at least 50,000 miles before…

A: Given, σ=8000n=28x=46500α=0.05 Since population standard deviation is known, therefore z-test should…

Q: A beverage machine is adjusted to release a certain amount of syrup into a chamber where it is mixed…

A: Given : Sample size (n) = 25 Sample mean (X¯) = 1.10 Sample SD (S) = 0.015 Confidence level = 95% So…

Q: The average earnings per share (EPS) for 10 industrial stocks randomly selected from those listed on…

A: Given,   Sample size = 10 Sample mean = 1.85 Sample standard deviation = 0.395   Since the…

Q: A survey conducted by the American Automobile Association showed that a family of four spends an…

A: a,Calculation of confidence interval:Here, the sample mean, x-bar is $252.45.Population mean, µ is…

Q: A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older…

A: Obtain the critical value: The level of confidence is 1- α = 0.90. The sample size is n = 21. The…

Q: A random sample of 100 households was selected as part of a study on electricity usage, and the…

A: Since the sample comes from a normal distribution, we know that the quantity. x-μαn~N(0,1),When σ is…

Q: Based on the 95% confidence interval (–0.076, 0.258), is there convincing evidence of a difference…

A: It is given that 95% confidence interval is (-0.076, 0.258) Test is that whether there is difference…

Q: oup of scientists studied the adhesion of various biofilms to solid surfaces for possible use in…

A: The sample size can be calculated as: n=z×σE2 Here, z = desired confidence level E = The allowable…

Q: In order to reduce the wait times and improve the facilities, a large walk-in clinic management…

A: Solution: Given information: n= 15 Sample size  The 95% confidence interval for the mean wait time…

Q: A random sample of 40   adults with no children under the age of 18 years results in a mean daily…

A: Given that, a random sample of 40 adults with no children under the age of 18 years results in 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.