A labor department wants to study mean age of all people in the civilian labor force. The average age of 49 randomly selected people in the civilian labor force is found to be 35.6 years. Assuming the population standard deviation is 11, what is the 95% confidence interval for true population mean?

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.21 and a…

A: X~N( μ , ?)   μ=8.21 , ?=1.48   Z-score =( x - μ )/?

Q: Researchers found that in certain counties in the country, females spend an average of 65 days in…

A: standard deviationσ=4n=36x¯=65

Q: Glaucoma is a disease of the eye that is manifested by high intraocular pressure. The distribution…

A: Let X denote the distribution of intraocular pressure in the general population and it approximately…

Q: he mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: As the population standard deviation is known, we will use z test. The null and alternative…

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 103 and a standard deviation…

A:

Q: Based on the hypotheses, find the following: Test Statistic z =    ?   (Round to 4 decimal places.)…

A: Given : sample size, n = 32 sample mean, x̄ = 12.3 population standard…

Q: the mean age when people got married for the first time in the year 2000 was 26 years old with a…

A: The random variable age of first marriage follows normal distribution. We have to test whether the…

Q: A random sample of 21 Camden County College students had a mean age of 24 years, with a standard…

A:

Q: adway Section 40 has an accident rate of 230 accident per 100 million vehicle miles VM). The mean…

A: We have given that  Sample size n = 230 Sample mean = 94 Standard deviation = 70 90 % confidence…

Q: Blood glucose levels for overweight tweens, adolescents between the age 9-12, have a mean of 100…

A: A hypothesis test can be conducted to test whether the population mean is equal to the claimed value…

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: What is the difference between commuting patterns for students and professors. 11 students and 14…

A:

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation…

A: The mean is 100 and the standard deviation is 15.

Q: he mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A:

Q: According to the National Health Statistics Report, a sample of 360 one year old baby boys in the US…

A:

Q: According to the American Medical Association, the average annual of radiologists in the USA are…

A:

Q: what would the 95% confidence limits for a sample of 120 with a mean of 51 and a standard deviation…

A: It is given that mean and standard deviation are 51 and 12, respectively.

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 100100 and a standard…

A: percentage of values greater than 145 = 0.15%  Explanation:Step 1: Define what the empirical rule…

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 100100 and a standard…

A: To find the percentage of IQ scores that are at least 52 using the empirical rule, we first need to…

Q: x¯ = Margin of error at 90% confidence level = 90% confidence interval =

A: Given: n=8 Confidence level=90% Height, X 67 66 64 75 63 67 72 71

Q: A statistics professor is in the process of investigating how many classes university students miss…

A: The population standard deviation is 2.2.

Q: The owner of Torpid Oaks B&B wanted to know the average distance its guests had traveled. A random…

A: The question is about confidence interval.Given :Randomly selected no. of guests ( n ) = 16Sample…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: Given,sample size(n)=32sample mean(x¯)=12standard deviation(σ)=1.8α=0.01

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 100100 and a standard…

A: Empirical rule: About 68% of data lies within the first standard deviation of the mean. About 95%…

Q: Suppose the scores of students on an exam are normally distributed with a mean of 337 and a standard…

A: Let X be the random variable from normal distribution with mean (μ) = 337 and standard deviation (σ)…

Q: If the mean and standard deviation of a sample of size 45 is 1050 and 52 respectively, construct a…

A: It is given that Sample mean = 1050Sample standard deviation = 52Sample size = 45Confidence level =…

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 101 and a standard deviation…

A: Given that Population mean=101 Standard deviation =14 Using the empirical rule, what percentage of…

Q: If the standard deviation is increased and the sample size and the confidence level stay the same,…

A: Error=Z×σn where σ: standard deviation             Z: z-score for the given confidence level…

Q: A study analyzed the body fat percentage of 80 ISU students. The sample mean was 23.70 and the…

A:

Q: Suppose that grade point averages at one university have a bell-shaped distribution with a mean of…

A: Let, X denote the grade point average.It is given that:X follows the bell-shaped distribution with…

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A:

Q: random sample of 20 data points has a sample mean of 375 and a sample standard deviation of 81.…

A: Given that  Sample size n =20 Sample mean=375 Sample standard deviation =81

Q: The owner of Limp Pines Resort wanted to know the average age of its clients. A random sample of 25…

A: We have given that Sample size (n) = 25Sample mean (x̅) = 46Standard deviations (s) = 5Confidence…

Q: Men hoping to have children are encouraged to avoid hot tubs or saunas because heating the scrotum…

A:

Q: Suppose that that the average BMI of the patients at Beth Israel Deaconness Medical Center is 30…

A:

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.9…

A: State the hypotheses That is, the mean age of smokers equals 13. That is, the mean age of smokers…

Q: 95% confidence interval of the population mean

A: Given : Sample Size, n = 40 Sample Mean, x̄ = 500 sample standard…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 2…

A: Given that  The mean age when smokers first start is 13 years old with a population standard…

Q: The mean age when smokers first start is 13 years old with a population standard deviation of 1.8…

A: mu = 13xbar = 12.2s = 1.8n = 32

Q: A popular weight loss program claims users will lose weight each month. Linda samples 25 dieters and…

A: We have given that,  Sample mean (x̄) = 10 pounds, standard deviation (s) = 2 pounds and sample size…

Q: In a random sample of six mobile​ devices, the mean repair cost was ​$65.00 and the standard…

A:

Q: Using 1% level of significance, test if the population average is not 73.

A: A normally distributed standardized English test is known to have a mean score of 73 and a standard…

Q: A credit counseling agency wants to estimate the mean amount of credit card debt held by Americans.…

A: Here we need to construct a 90% confidence interval for the population mean.

Q: random sample of 100 commute times is collected from the entire population of commuters in the…

A: mean = 45 standard deviation = 30 n = 100

Q: The mean age when people got married for the first time in the year 2000 was 26 years old with a…

A: Given, Mean μ = 26 Standard deviation σ = 6 Sample size n = 50 Sample mean x¯ = 27.7 Confidence…

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.