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Z follows standard
Find p(2.1<Z<2.4)?
Round answer to 3 decimal places
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- A company that manufactures batteries used in electric cars is reporting that their newest model of battery has a mean lifetime, µ, of 18 years. To test the company's claim, a competitor has selected 56 of these batteries at random. The mean lifetime of the sample is 18.9 years. Suppose the population standard deviation of these lifetimes is known to be 4.8 years. Is there enough evidence to reject the claim that the mean lifetime of the newest model is 18 years? Perform a hypothesis test, using the 0.05 level of significance. (a) State the null hypothesis H, and the alternative hypothesis H,. Ho: 0 Onormal distribution with a mean of u = 23.8 in, and a standard deviation of a = 1.1 in. These data are often used in the design of different Suppose that the sitting back-to-knee length for a group of adults has seats, including aircraft seats, train seats, theater seats, and classroom seats. Instead of using 0.05 for identifying significant values, use the criteria that a value x is significantly high if P(x or greater)50.01 and a value is significantly low if P(x or less) s0.01. Find the back-to-knee lengths separating significant values from those that are not significant. Using these criteria, is a back-to-knee length of 26.0 in. significantly high? Find the back-to-knee lengths separating significant values from those that are not significant. Back-to-knee lengths greater than in. and less than (Round to one decimal place as needed.) in. are not significant, and values outside that range are considered significant. Using these criteria, is a back-to-knee length of 26.0 in.…Systolic blood pressure readings are normally distributed with a mean of 121 and standard deviation of 15. If a person from the population was selected at random, find the probability that their blood pressure is in the acceptable range (between 114 and 140) for an athletic activity. A. Label and shade the normal distribution curve to model this problem.Testing:H0:μ=38.5H1:μ<38.5Your sample consists of 35 subjects, with a mean of 38.3 and a standard deviation of 1.93.Calculate the test statistic, rounded to 2 decimal places. t =Scores on a standardized exam are known to follow a normal distribution with standard deviation σσ = 17. A researcher randomly selects 85 students and computes their average score. He reports that the mean score is 76.3, with a margin of error of 2.792. How confident are you that the mean score for all students taking the exam is in the interval (73.508, 79.092)? Confidence =Two thousand students took an exam. The scores on the exam have an approximate normal distribution with a mean μ=79μ=79 points and standard deviation σ=15σ=15 points. Round your answers to one decimal place. (a) Calculate the first- and third-quartile scores for this exam. Q1=Q1= pointsQ3=Q3= points (b) The middle 50%50% of the exam scores are between what two values?Enter your answers in increasing order.The middle 50%50% of the exam scores are between points and points. Submit AssignmentA distribution of values is normal with a mean of 60 and a standard deviation of 3. Find the interval containing the mid-68% of the values. Please show your answer to 1 decimal place. Interval = (,)Using Excel to calculate to 2 decimal places, if X follows a normal distribution with mean 55 and variance 16 and PDX > y) = 0.401294 then pic 5A random sample of size n=593n=593 from a population whose parameter is p=0.4p=0.4. What is the mean of the distribution of sample means? Round the answer accurate to 2 decimal places. What is the standard deviation of the distribution of sample means? Round the answer accurate to 2 decimal places.SEE MORE QUESTIONS
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