A study of working actors looked at age and gender. One sample of 55 male actors had a mean age of 32 and a standard deviation of 2. The other sample included 55 female actors with a mean age of 28 and a standard deviation of 4. Estimate with 90% confidence the difference between the average ages of working male (μ1) and female (μ2)actors. Round answers to the nearest hundredth. < μ1 - μ2 <

Q: he ages of people living in a retirement community are normally distributed with a mean age of 68…

A: Let X denote the ages of people living in a retirement community and it follows normal distribution…

Q: To estimate the mean height μμ of male students on your campus, you will measure an SRS of students.…

A: The formula of to compute z score is,. The empirical rule 68-95-99.7 states that 68% of the data…

Q: The mean score on a standardized test is 540 with a standard deviation of 55. What percent of…

A: Given mean= 540 Standard deviation=SD= 55 We have to find the z value of 625.

Q: On a recent quiz, the class mean was 77 with a standard deviation of 2. Calculate the z-score (to 2…

A: Solution-: Given: μ=77,σ=2,X=78 We want to find Z-score=?

Q: After hundreds of samples, you have determined that the mean and standard deviation of the iron…

A: The question is about continuous probability distribution.Given :Mean of the iron content in a…

Q: support the scientist’s estimate

A: A scientist estimates that the mean nitrogen dioxide level in Westman is greater than 28 parts per…

Q: A sample of 100 individuals has a mean depression score of  20 with an SD of 2. What is the standard…

A: The formula for calculating the standard error of the sample is,

Q: You are a researcher studying the lifespan of a certain species of bacteria.  A preliminary sample…

A: The provided information are: Population standard deviation σ=4 Margin of error (E) = 0.5 Confidence…

Q: Scores on a test have a mean of 86 and a standard deviation of 13. Jerrica has a score of 94.…

A:

Q: The time married men with children spend on child care averages 6.1 hours per week (Time, March 12,…

A: The hypotheses can be constructed as: H0: µ = 6.1 H1: µ ≠ 6.1 Sample size (n) = 40 Assume level of…

Q: The scores on a test are normally distributed with a mean of 70 and a standard deviation of 14, find…

A:

Q: The effect of a medication can be evaluated by how many days the patient recovered. 10 patients are…

A: Test for Standard deviation: The χ2 Chi-Square test is used to test the significance difference…

Q: The scores on a mathematics exam have a mean of 71and a standard deviation of 8. Find the x-value…

A: Let X denote the scores on a mathematics exam and it follows normal distribution with mean of…

Q: The scores on a standardized test are normally distributed with a mean of 80 and standard deviation…

A:

Q: what percent of the students scored higher than 68?

A: It is given thatMean, μ = 70Standard deviation, σ = 3Z-Score, Z = ( X - μ )/σwhere, Z be the…

Q: To estimate the mean height μ of male students on your campus, you will measure an SRS of students.…

A: From the provided information, The height of young men are approximately normal with standard…

Q: It takes an average of 9.9 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: From the provided information,

Q: Researchers measured the waist sizes of 230 men in a study on body fat. The true mean and standard…

A: Suppose researchers measured the waist sizes of  men in a study on body fat. The true mean:…

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

A:

Q: A normal population has a mean= 61 and standard deviation=16. what proportion of the population is…

A: From the provided information, Mean (µ) = 61 Standard deviation (σ) = 16 X~N (61, 16)

Q: The mean grade on a statistics exam is/M=82, the standard deviation is=12. What actual grade has a…

A: The normal distribution  in the center are generally denser and basically less denser at tails.…

Q: A random sample of 100 male students is drawn from a particular class. The mean and standard…

A:

Q: Your medical research team is investigating the standard deviation of the cost of a​ 30-day supply…

A:

Q: If the scores on a test have a mean of 43 and standard deviation of 1.5, what is z score of 45?

A: In order to solve for the equivalent z score, we will use the z score formulaFormula:z =…

Q: a male polar on average weighs 525 kg the population of standard deviation is 58 kg suppose that the…

A: Given information- Population mean, µ = 525 kg Population standard deviation, σ = 58 kg Let X be the…

Q: In a population of exam scores, a score of X = 88 corresponds to z = 2 and a score of X = 79…

A: From the provided information, A score of X = 88 corresponds to z = 2 A score of X = 79 corresponds…

Q: It takes an average of 9.1 minutes for blood to begin clotting after an injury. An EMT wants to see…

A: The sample size is .The sample mean is .The sample standard deviation is .The significance level is…

Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A: Let k is 0.6 standard deviation below the mean.  That means -0.6 is the z score of the value.…

Q: The mean score in a test is normally distributed with mean 30 and standard deviation 10. What is…

A: Given :  Mean, μ = 30 standard deviation, σ = 10 x = 55

Q: It takes an average of 8 minutes for blood to begin clotting after an injury. An EMT wants to see if…

A: Solution:- from given information claim:  if the average of 8 minutes will increase if the patient…

Q: The ages of people living in a retirement community are normally distributed with a mean age of 68…

A:

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

A: The test score is 0.6 standard deviations above the mean is obtained below: From the given…

Q: It takes an average of 8 minutes for blood to begin clotting after an injury. An EMT wants to see if…

A:

Q: standardized test has a pop. mean of 152 and a standard deviation of 16. Jenny has a z score of…

A: Given that n=500, z=-0.56

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Given,standard deviation(σ)=8margin of error(E)=2α=1-0.94=0.06α2=0.03Z0.03=1.8808       (from…

Q: A researcher named liza wants to estimate the mean age of pilots in an airline company. The…

A: Given: σ=6.30Length of the interval=3.2

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…