Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired students averaged 9.38 hours of sleep, with a standard deviation of 1.63 hours. Assume that the number of hours of sleep for these visually impaired students is normally distributed. (a)  What is the probability that a visually impaired student gets less than 66 hours of sleep? (b)  What is the probability that a visually impaired student gets between 6.7and 7.79 hours of sleep? (c)  Fourty percent of students get less than how many hours of sleep on a typical day?

Q: Medical research has concluded that people experience a common cold roughly two times per year.…

A: The mean of the normal distribution, The standard deviation of the distribution,

Q: At a large department store, the average number of years of service was 13.5 years with a standard…

A: The objective of this question is to find the probability that a randomly selected employee has…

Q: A Texas Instrument calculator operating life is normally distributed with a mean of 3,850 hours, and…

A: Given information- Population mean, μ = 3850 hours Population standard deviation, σ = 350 hours…

Q: The fares received by Uber Drivers working in the City line are normally distributed with a mean of…

A: Let X be a continuous random variable of fares received by Uber Drivers working in the City line are…

Q: The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket…

A: 1] μ=3852] σ=1103] X: Domestic AirfaresX~N μ=385, σ2=1102

Q: Deforestation along the Sierra Madre mountains have been especially notorious. The average number of…

A: It is given that  Mean, μ = 4115 Standard deviation, σ = 610 Z-Score, Z = ( X - μ )/σ

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: GivenMean(μ)=1.8standard deviation(σ)=0.95sample size(n)=50

Q: SAT Verbal Scores...Do students who learn English and another language simultaneously score worse on…

A: Denote μ as the mean SAT critical reading exam score.

Q: In it's Fuel Economy Guide, the Environmental Protection Agency gives a variety of data on 2016…

A:

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: We want to find the probability of sample mean is 1.77 or more  P(x̄≥1.77)

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: In a study of work patterns, data from 669 subjects were collected. For the time spent in child…

A: We have given that,  Let X be the random variable from normal distribution with mean (μ) = 23.08,…

Q: A survey showed that 75% of adults need correction (eyeglasses, contacts, surgery, etc.) for their…

A: From the provided information, Sample size (n) = 11 75% of adults need correction for their eyesight…

Q: A set of final examination grades in an introductory statistics course is normally​ distributed,…

A: Given that, A set of final examination grades in an introductory statistics course is normally​…

Q: The starting salaries of individuals with an MBA degree are normally distributed with a mean of…

A: According to the given information in this question We need to find the probability that MBA degree…

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: We have to find out given probability..

Q: The mean cost of domestic airfares in the United States rose to an all-time high of $395 per ticket.…

A: Hey, since there are multiple sub-part questions posted, we will answer first three questions. If…

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: airfares in the United States rose to an all-time high of $375 per ticket. Airfares were based on…

A: Comment: As per the our company guidelines we are supposed to answer only three subparts. Kindly…

Q: in a recently conducted study, families reported using an average of 70 gallons of gasoline per…

A:

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: To find: what is the probability that the mean weight loss after one week on this pill for a random…

Q: IUSS pill advertises that people who use the pill lose, after one week, an average (mean) of 1.8…

A: We have given that  X~N( μ , ?^2 )   Z-score =( x - μ )/?

Q: Data from the Bureau of Labor Statistics’ Consumer Expenditure Survey show that annual expenditures…

A: Given information- For the year 2001- Population mean, µ = $235 Population standard deviation, σ =…

Q: Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted.…

A: It is given that the mean is 8.41 and the standard deviation is 2.53.

Q: suppose the walking step lengths of an adult males are normally distributed with a mean of 2.7 feet…

A: Given that  Mean=μ=2.7 Standard deviation=σ=0.3 Sample size=n=70 X~Normal(μ=2.7,σ=0.3)

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: An ecologist is examining whether the number of fish caught in a large river basin has changed since…

A:

Q: The amounts of time students study for an exam follows a normal model with a mean of 6 hours and a…

A: Obtain the standard z-score for the random variable X equals 3.5. The standard z-score for the…

Q: In a study investigating the effect of car speed on accident severity, 5,000 reports of fatal…

A: given dataN = 5000normal distributionμ = 45 mphσ = 14 mph

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

Q: Researchers doing a study comparing time spent on social media and time spent on studying randomly…

A:

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A: Given that mean =1.85,s.d =1.02,n=55,x bar =1.88

Q: In a recently conducted study, families reported using an average of 70 gallons of gasoline per…

A:

Q: The starting salaries of individuals with an MBA degree are normally distributed with a mean of…

A: From the provided information, Mean (µ) = $40,000 Standard deviation (σ) = $5,000

Q: The monthly utility bills in a city are normally​ distributed, with a mean of $100 and a standard…

A:

Q: Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted.…

A: It is given that  Mean, μ = 8.2 Standard deviation, σ = 2.2 Z-Score, Z = ( X - μ )/σ

Q: In its fuel economy economy guide, the EPA gives a variety of data on 2016 model year vehicles.  If…

A: Let X denote the highway gas mileage is approximately normally distributed with mean 23.0 mpg and…

Q: What is the probability that a randomly selected student will drink less than the suggested amount…

A:

Q: The amount of money that college students spend on food each week during the academic year is…

A: Given,mean(μ)=31.28standard deviation(σ)=11.42sample size(n)=10

Q: The producer of a weight-loss pill advertises that people who use the pill lose, after one week, an…

A:

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.