personnel manager has found that historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 36.4 points. A random sample of 16 test scores from the current group of applicants had mean 185.3 points. Based on these sample results, a statistician found for the population mean a confidence interval running from 167.5 to 203.1 points. What’s the probability content of this interval.

Q: A random sample of 59 four-year-olds attending daycare centers provided a yearly tuition average of…

A:

Q: 4. Felician University uses hundreds of fluorescent light bulbs each year. The brand of bulb it…

A: The mean lifetime of current brand that it uses is of 900 hours. The mean and standard deviation of…

Q: The XYZ business school has undergraduate programs at its Korea Campus. Courses are the same as are…

A: Given that  Number of students = 55 mean score = 83 standard deviation of score = 7.2  Fairfax…

Q: Dana is a math professor who usually teaches in-person but has recently started teaching online.…

A: Given that, mean , μ=76.5standard deviation,σ=19.1and sample mean(class-average),x =68.4 and sample…

Q: Suppose you want to test if left-handed individuals have a higher IQ than right-handed individuals.…

A: State the hypotheses. That is, the left- and right-handed individuals have the same IQ. That is,…

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: A consumer organization inspecting new cars found that many had appearance defects​ (dents,…

A: For the given data  Find the expected number of appearance defects in a new car and the standard…

Q: A psychological study found that men who were distance runners lived, on average, five years longer…

A: Given information- We have given two samples of distance runners and non-distance runners. For…

Q: he weights of toilet paper rolls are normally distributed with a mean of 7 ounces and a standard…

A: mu = 7 s = 0.6

Q: b) A bottled water company has found in the past that 2% of their bottled water does not meet the…

A:

Q: In a survey, 45 people were asked how much they spent on their last partners birthday gift. The…

A: Given information- Sample size, n = 45 Significance level, α = 0.10 Sample mean, x-bar = $90 Sample…

Q: A study on the lifestyles of visually impaired students was conducted by asking them to keep a diary…

A: From the information, given thatLet X denotes the number of hours of sleep for these visually…

Q: A study was commissioned to find the mean weight of the residents in certain town. The study…

A: Given: n=58, x=174 and s=38. Now,Degrees of freedom=n-1=58-1=57 Then, at 95% confidence level, the…

Q: The length of an episode of the hit TV show, Fake Blood, is normally distributed with a mean of 62…

A: Given that  X~Normal(μ=62 , ?=4.5) Mean=μ=62 , Standard deviation=?=4.5)

Q: Females in a random sample have an average height of 63 inches with a standard deviation of 1.5…

A: Confidence interval: Confidence interval is an interval such that the probability of the unknown…

Q: We are trying to test whether, a new low fat diet actually helps obese people lose weight. 150…

A: Solution: Hypothesis testing:   From the above hypothesis test we can conclude that the low fat…

Q: A certain company breaks down their metal and distributes them as pellets to their customers. Their…

A: Let- sample size is given to be 2. To find- Now, by properties of sampling-

Q: A developmental psychologist would like to know whether success in one specific area can affect a…

A:

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

A:

Q: A manufacturer of a lightbulb claimed that its lightbulbs have a mean lifetime of 700 hours with a…

A: Given Mean=mu=700 Standard deviation=sigma=120 n=144

Q: A consumer organization inspecting new cars found that many had appearance defects​ (dents,…

A: Given -  A consumer organization inspecting in new car found defects are, 8 % had exactly three ,…

Q: A small group of 15 hummingbirds has been under study. The average weight for these birds is found…

A:

Q: In a certain university, a student can qualify for a masteral degree program in Business…

A: Given info: The test scores is normally distributed with mean of 175 and standard deviation of 20.

Q: Fran is training for her first marathon, and she wants to know if there is a significant difference…

A: Given data,n1=40x1=46.6σ1=4.6n2=45x2=48.8σ2=2.4Compute value of test statistic?

Q: We have developed a series of questions to measure job satisfaction of bus drivers in London,…

A:

Q: You are the human resources director for a corporation and want to implement a health improvement…

A: Since this is a multiple part question; only 1st 3 parts are answered.

Q: Suppose that, in 1995, the weight of 16-year old males in the United States was normally distributed…

A: Thank you for posting this question ! You have correctly chosen that a z test needs to be performed…

Q: Zia intends to buy a brand-new phone with a battery life of more than six hours for her mother. Most…

A: 1 hour = 60 minutes 6 hours = 60 * 6= 360 minutes The probability that battery life is more than 6…

Q: An existing inventory for a test measuring self-esteem indicates that the scores have a standard…

A: Mean()=61standard deviation()=12sample size(n)=70confidence level=90%

Q: According to PSA, the probability of a randomly selected 90-year old Filipino survives for at least…

A: Given information: n=20p(success=survive another year)=82% or 0.82q(failure= not survive another…

Q: A random sample of 30 words from Jane Austen's Pride and Prejudice had a mean length of 4.08 letters…

A: Given Jane Austen's P&P Sample size of words, n1=30 Mean length, x1=4.08 Standard Deviation,…

Q: Suppose we want a 99% confidence interval for the average amount spent on books by freshmen in their…

A: Standard Deviation = σ = 31 Margin of Error = E = 3 Confidence Level = 99 Significance Level =…

Q: After post-graduate study, Mike found a job as HR analyst in London. The company is currently…

A:

Q: The dean randomly selected 33 students who took the calculus final exam and looked at their scores…

A:

Q: Newborn elephant calves usually weigh between 200 and 250 pounds-until October 2006, when an Asian…

A: given data normal distributionμ = 227σ = 48P(x≥384) = ?

Q: BEING SPECIFIC, what kind of statistical analysis should you perform, and WHY? Three parts of your…

A: Given is the question to decide which statistical should be performed.

Q: An energy study found that household use of electricity had a mean of 682 and a standard deviation…

A: I am solve this by using standard normal table

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

A: