A study of working actors looked at age and gender. One sample of 55 male actors had a mean age of 34 and a standard deviation of 3. The other sample included 55 female actors with a mean age of 40 and a standard deviation of 2. Estimate with 95% confidence the difference between the average ages of working male (μ1μ1) and female (μ2μ2) actors. Round answers to the nearest hundredth. < μ1−μ2<

Q: A health care prifessional wishes to estimate the birth weights of infants. How large a sample must…

A: Given Information :  A health care professional wishes to estimate the birth weights of infants. He…

Q: According to a survey, the mean height for men is 69.1 inches. In a sample of 280 men between the…

A: given data claim : μ &lt; 69.1n = 280x¯ = 68.9σ = 2.88

Q: The mean wingspan of a sample of 31 birds of a particular species is 30 inches.  The standard…

A: Sample size n =31 Sample mean=30 Population standard deviation =4

Q: A sample has a mean M = 55. In the sample, a score of X = 48 corresponds to z = -1.20. What is the…

A:

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 261.5…

A: Given data, Mean=261.5 sd=17.6 In what range would you expect to find the middle 68% of most…

Q: A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1025 h with a…

A: Mean = 1025 Standard deviation = 85 Raw score = 950

Q: Fluorescent lighbulbs have lifetimes that are normally distributed with a mean of 6.1 years and a…

A: Step 1:The lifetime of fluorescent lightbulbs is normally distributed.mean(μ)=6.1 yearstandrad…

Q: The number of minutes spent reading in one day is normally distributed with a mean of μ = 23 and a…

A: The normal distribution:A continuous random variable X is said to follow normal distribution if the…

Q: The human population has a mean IQ score of µ = 100 and a standard deviation of σ = 15. Find the…

A: From the given information, µ = 100 and σ = 15.

Q: Assume that adults have IQ scores that are normally distributed with μ=38 and a standard deviation…

A:

Q: study of working actors looked at age and gender. One sample of 75 male actors had a mean age of 25…

A: Given that  Sample Mean 1 (\bar X_1)(Xˉ1​) = 2525 Sample Standard Deviation 1 (s_1)(s1​) = 22…

Q: The life of a 9-volt battery is normally distributed with a mean of U = 2000 hours and a standard…

A: Percentiles: If the elements in the data set are arranged in ascending order of magnitude, then the…

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: Assume that adults have IQ scores that are normally distributed with μ=105 and a standard deviation…

A: Assume that adults have IQ scores that are normally distributed with μ=105 and a standard deviation…

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A: The confidence level is 0.98 The margin of error  ME=2 The population standard deviation σ=8 The…

Q: A distribution of values is normal with a mean of 235 and a standard deviation of 14.4. Find P63,…

A:

Q: A distribution of values is normal with a mean of 141.6 and a standard deviation of 44. Find P65,…

A: Given Information: Mean μ=141.6 Standard deviation σ=44 To find Percentile P65: Using a standard…

Q: The weight of newborn babies is normally distributed, with a mean of 3.7 kilograms and a standard…

A: GivenThe weight of new born babies are normally distributed.The mean =3.7 KgThe standard deviation…

Q: Assume that 11.7% of adults consider being a professional athlete their dream job. Find the…

A: It is given that p = 0.117 and n =2,760.

Q: Suppose that the hemoglobin levels among healthy females are normally distributed with a mean of…

A: It is required to find the standard deviation of the distribution of hemoglobin levels in healthy…

Q: The Central Intelligence Agency (CIA) has specialists who analyze the frequencies of letters of the…

A: Obtain the mean and standard deviation for the number of times the letter a will be found on…

Q: The standard deviation of pulse rates of adult males is  less 11 bpm. For a random sample of  128…

A:

Q: A schoolteacher average concentration of 5.4 pCI/L with a standard deviation of 1 pCi/L. Calculate…

A:

Q: A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1026 h with a…

A: Given :- A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1026…

Q: A population has a mean of 17 with a standard deviation of 2. A sample of 50 items from that…

A:

Q: Fluorescent lighbulbs have lifetimes that are normally distributed with a mean of 6.9 years and a…

A: According to the given information, we have Mean = 6.9 Standard deviation = 1

Q: The Central Intelligence Agency (CIA) has specialists who analyze the frequencies of letters of the…

A:

Q: At a hair salon, customers arrive at the rate of 3 customers per hour. The standard deviation of the…

A: Standard Deviation: A standard deviation is a unit of measure of data spread in proportion to the…

Q: The human population has a mean IQ score of µ = 100 and a standard deviation of σ = 15. Find the…

A: The normal distribution is the most useful theoretical distribution for continuous variables.…

Q: A population of score has μ = 90. In this population, a score of X = 100 correponds to z = 5. what…

A: