Study on how much time people spend with family in a day shows that the time spending distribution is approximately normally distributed with a mean of 86 minutes and a standard deviation of 32 minutes. Q: Suppose a random sample of 20 people is obtained, describe the sampling distribution of the sample mean time people spend with family in a day.

Q: hat is the Normal Distribution Probability where X is more than 268.66 for a mean of 145, and…

A:

Q: In India, four-year-olds average three hours a day unsupervised. Most of the unsupervised children…

A: Determine the Z score for the random variable X equals 10. The Z score for the random variable X…

Q: n the state of Ohio, data has shown that 9% of adults are illiterate (lack basic reading and writing…

A: Solution: Given information: n1=300 Sample size of adults from Alabama n2=250 Sample size of adults…

Q: In a normal distribution, find the mean if the standard deviation is 100, and 70.19% of the total…

A: Given that the standard deviation is 100 and 70.19% of the total area lies to the right of 500. That…

Q: In a sample of 250 student GPAs, the mean is 3.25 with a standard deviation of 0.22. Use the…

A: From the given information, there are 250 student GPAs with the sample mean 3.25 and the standard…

Q: 7.) Assume that the speed of automobiles on an expressway during rush hour is normally distributed…

A:

Q: Decide if the statement is True or False. A sampling distribution of sample means has a standard…

A: The standard deviation of the sampling distribution of sample means is given by:

Q: Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the…

A: Given data,μ=180000σ=39000

Q: a) What percent of the SAT verbal scores are less than 675​? (b) If 1000 SAT verbal scores are…

A: mean = 503 s = 109

Q: A company carries out copier maintenance repairs. According to the records, a service time average…

A: Given, Mean, mu= 75 Standard deviation, sigma= 20 We know z score=(X-mu)/sigma

Q: At Intel, the sizes of processor chips have a mean of 1 cm with a standard deviation of 0.2 cm.…

A:

Q: A manufacturer produces ball bearing with a mean diameter of 3.00 mm and a standard deviation of…

A: Given information: Mean diameter of ball bearing μ=3.00 mm Standard deviation of ball bearing σ=0.20…

Q: A study has shown that 15% of all college textbooks have a price of $178.52 or higher.  It is known…

A: From the provided information Standard deviation (σ) = $32.55 Let X be a random variable which…

Q: A population has a mean of u = 30. If 3 points are added to each score, what is the mean for the new…

A: Given :  Mean(μ)=30 and N=3

Q: Convert score 46 to z-score if the mean is 40 and the standard deviation is 4.

A: The definition of a z-score is:   z = (X - μ) / σ

Q: Use the normal distribution of SAT critical reading scores for which the mean is 512 and the…

A: Here the verbal SAT scores are normally distributed with mean=512 and SD=111. We need to compute the…

Q: the time it takes a student to complete the statistics exam follows a normal distribution with a…

A:

Q: The proportion of all high school students who watch national news is p = 0.57. A random sample of…

A: Given  p=0.57 n=60

Q: r air travelers, one of the biggest complaints is of the waiting time between when the airplane kis…

A: NOTE: As per the guidelines, we are supposed to solve the first and one question at a time. Please…

Q: The time that a customer takes to complete a transaction in a business line at the bank follows a…

A: Given data,Mean μ=5.4sd    σ=1.7How many minutes will 20% of the customers spend completing a…

Q: 25. Assume that the hourly cost to operate a commercial airplane follows the normal distribution…

A: The random variable hourly cost follows normal distribution. The population mean is 2100. The…

Q: Use the normal distribution of SAT critical reading scores for which the mean is 508 and the…

A: Given that X follows Normal distribution with mean = 508 and SD = 116, then Z = (X - mean)/SD = (X -…

Q: Assume the credit card balances of younger college educated employed persons are normally…

A:

Q: In a distribution where the mean is 80 and the standard deviation is 3​, find the largest fraction…

A: Given

Q: Twenty percent of the students in a class of 100 are planning to go to graduate school. The standard…

A: Given:  Let n represents the number of students in the class (n=100). Let p represents the…

Q: The percent fo Coloradans that own a Subaru is 56%. If you were to take a random sample of size 70,…

A: We have given that,  Let X be the random variable from binomial distribution with probability (p) =…

Q: In a normal distribution, 31% of the items are under 45 and 8% are over 64. Find the mean and the…

A: Given Data: Let X represent the variable P(x<45)=0.31 P(x>64)=0.08   X~ Normal μ, σ2   To…

Q: Use the normal distribution of SAT critical reading scores for which the mean is 513 and the…

A:

Q: What position [how many standard deviations] in the distribution corresponds to z-score of z= -1.00?

A:

Q: Use the standard normal distribution to compare two other normal distributions. 25. Blood pressure…

A: (25) Determine the Z score value of the participant being measured using the systolic pressure,…

Q: In a standardized exam the mean score is 400 with a standard deviation of 50. If a random sample of…

A: Given that  μ= 400 , σ= 50 , n = 25

Q: In a job fair, 5,000 applicants applied for a job. Their mean age was found to be 28 with a standard…

A:

Q: boulder 10k race was 1.78 standard deviations faster than women's average group. 405 women ran ,…

A: Given See the handwritten solution

Q: A recent study done on college students found that the mean time they spend on homework assignments…

A: Given data,Mean μ=6.5sd     σ=1.2n=50Describe the sampling  distribution of sample mean

Q: a sample of n=300 male college freshmen has a mean weight of 160 with a standard devation of 11. how…

A: It is given that the weight of freshmen follows normal distribution with mean of 160 and standard…

Q: High school students across the nation compete in a financial capability challenge each year by…

A: Given: Students who score in the top 19 percent are recognized publicly for their achievement by the…

Q: A politician takes an SRS of 75 citizens in a county to see what proportion of citizens sampled are…

A: A politician takes an SRS of 75 citizens in a county to see what proportion of with their standard…

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.53.…

A:

Q: Suppose that the distance of fly balls hit to 268 feet and a standard deviation of 43 feet a. What…

A: Given Data Population Mean,μ = 268.0 Population Standard Deviation,σ = 43.0

Q: Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires.…

A:

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.62.…

A: Solution: From the given information, the true proportion of voters in the county who support a new…

Q: As the sample size n increases, the standard deviation of the sampling distribution decreases.

A: The standard error (SE) of a statistic is approximately the standard deviation of a statistical…

Q: A recent article in a business journal reported that the mean annual salary for graduates from 30…

A: Given,sample size(n)=75mean(x¯)=$275,000population standard…

Q: In a normal distribution, it is known that 27.34% of all the items are included from 100 up to the…

A: X~N(μ,σ2)Then,Z=X-μσ~N(0,1)Given, P[100<X<μ]=0.2734and,…

Q: Use the normal distribution of SAT critical reading scores for which the mean is 508 and the…

A: Given μ=508 and σ=109   Use standardization to calculate probability asz=x-μσ

Q: For a large Internet seller their average customer spent $51.28 during the Black Friday sale with a…

A: Solution

Q: a. Find the probability that an individual distance is greater than 214.30cm.? b. Find the…

A: a. Let x be the overhead reach distances of adult females which follows normal distribution with…

Q: A final exam in math 160 has a mean of 73 with a standard deviation of 7.73. Assume that a random…

A:

Q: Assume all populations are normally distributed. A travel analyst claims that the mean price of a…

A:

Q: Among third year students at AUM, scores in Probability and Statistics follow a normal distribution…

A: Given: Population mean  = 82 Population standard deviation = 4 Consider X be the random variable…

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.