According to an almanac, 70% of adult smokers started smoking before turning 18 years old. (a) Compute the mean and standard deviation of the random variable X, the number of smokers who started smoking before 18 based on a random sample of 300 adults. (b) Interpret the mean.

Q: For this exercise, round all regression parameters to four decimal places. The following table…

A: In this case, year (t) is the independent variable and income from sales (S) is the dependent…

Q: Assume that adults have iq scores that are normally distributed with a mean of 100 and a standard…

A: Solution: Let X be the adults IQ score has normally distributed with mean μ=100 and standard…

Q: In New York State, the population of teachers is known to have an average of 12.2 years of classroom…

A:

Q: A score that is 9 points above the mean corresponds to a z score of +1. What is the population…

A: As given: A score is 9 points above the mean.  It corresponds to a z score of +1.  It is required…

Q: A recent poll found that 59% of adults believe the state of moral values is poor. For 400 randomly…

A: Here, n = 400 and p = 0.59

Q: The distribution of scores for the third exam in a statistics course has a mean of 74 and a standard…

A: Given Information: Mean, μ=74 Standard Deviation, σ=15 Sample Size, n=36

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A: The sample mean and the standard deviation are μ = 80 and σ = 12 respectively.Let X denotes the…

Q: A study of commuting times reports the travel times to work of a random sample of 20 employed adults…

A: Given information- Sample size (n) = 20 Sample mean x̅ = 31.25 minutes Sample standard deviation (s)…

Q: In 1999, the murder rates (per 100,000) for the 50 states and the District of Columbia had a mean of…

A:

Q: According to an almanac, 70% of adult smokers started smoking before turning 18 years old. (a)…

A: The mean of the Binomial distribution is given by Mean=n*p

Q: Suppose the prevalence of type II diabetes in a community is 36%. Researchers want to sample 16…

A:

Q: A simple random sample of 100 observations was taken from a large population. The sample mean and…

A: Given that ,                    sample size n=100                    Mean u=80…

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

A:

Q: A random sample of 18 light bulbs is drawn from a normally distributed population. The population…

A:

Q: According to the American Red Cross, 11.6% of all Connecticut residents have Type B blood. A random…

A: The question is about discrete probability distributionGiven :Probability of all CT residents have…

Q: For a random sample of 9 women, the average resting pulse rate is x-bar = 76 beats per minute, and…

A:

Q: (b) What is the 95% confidence interval estimate of the population mean examination score if a…

A:

Q: Do female college students spend more time than male college students watching TV? This was one of…

A: Let μMales be the mean time spent watching TV per day by males and μFemales be the mean time spent…

Q: For a random sample of 9 women, the average resting pulse rate is x̅ = 76 beats per minute, and the…

A: Given: Sample size (n) = 9 Sample mean x¯=76 Sample standard deviation (s) = 5

Q: Can the standard deviation of a data set be zero

A: Standard deviation can not be negative.

Q: a survey found that 21% of Americans watch fireworks on television on July 4.  Find the mean,…

A: According to the given question, a survey found that 21% of Americans watch fireworks on television…

Q: A simple random sample of 36 observations was taken from a large population. The sample mean and the…

A:

Q: The average number of customers that visited a particular store during the past year is 160 per day…

A: It is given that the standard deviation is 25.

Q: According to an​ almanac, 80​% of adult smokers started smoking before turning 18 years old. ​(a)…

A: From the provided information, 80​% of adult smokers started smoking before turning 18 years old…

Q: The average score of all golfers for a particular course has a mean of 74 and a standard deviation…

A:

Q: As an electrical engineer, you have designed a new efficient light bulb. In order to predict its…

A: Formula  Used: Mean X = ∑FX∑F Standard deviation = ∑FX2-nX2∑F-1

Q: University students' blood pressure can be expected to follow a normal distribution with a mean of…

A:

Q: The average score of all pro golfers for a particular course has a mean of 70 and a standard…

A: It is given that, The average score of all pro golfers for a particular course has a mean of 70 and…

Q: probability that a patient recovers from a rare blood disease is 0.4. If 15 people are known to have…

A: Given problem is binomial distribution Let, X: Patient recovers from a rare blood disease p=Prob. of…

Q: A sociologist found that in a sample of 45 retired men, the average number of jobs they had during…

A: Given : population mean ,u = 7.2  population standard deviation,σ = 2.3

Q: 5 will be drawn from a population of test takers with a mean of 150 and standard deviation 9. Find…

A: Given that  Sample size (n) = 75 Population mean (μ) = 150 Standard deviation (σ) = 9   We know that…

Q: A study of commuting times reports the travel times to work of a random sample of 1068 employed…

A: Given data,  x = 54.0  s = 60.9 minutes n=1068 standard error of the mean=?

Q: According to a study of TV viewing habits, the average number of hours an American over the age of 2…

A: Given data,Standard deviation is σ=16If n=64 standard error of the mean(σx)=?

Q: A population of scores has a mean of 56. In this population, a raw score of 40 corresponds to a z…

A: Given Information: A population of scores has a mean of 56. μ=56 Raw score X = 40 corresponds to a z…