Suppose that a study is carried out on the performance of the companies WM and TX for which two independent random samples of size 12 of the daily returns are taken fo
Q: c) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: There are two independent samples which are active and inactive African men. We have to test whether…
Q: c) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: There are two independent samples which are active and inactive African men. We have to test whether…
Q: Suppose the length of the pregnancies of a certain animal are approximately normally distributed…
A: It is given that Mean, μ = 285 Standard deviation, σ = 27 Sample size, n = 18
Q: he university data center has two main computers. The center wants to examine whether computer 1 is…
A: GivenFor computer -1Mean(x¯1)=62standard deviation (s1)=16sample size(n1)=11For…
Q: 4. Researchers working for a sports drink company would like to know if a new blend if its popular…
A: now will use T-DISTRIBUTION table to calculate following t-values corresponding given p-value and…
Q: 4. Researchers working for a sports drink company would like to know if a new blend if its popular…
A: The Alternative hypothesis is define as that you might believe to be true or hope to prove true
Q: A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: There are two independent samples which are active and inactive African men. We have to test whether…
Q: to use one-way anova, it is assumed that k independent random samples are drawn from k specific…
A: It is given that K independent random samples ate drawn from some populations.
Q: If the standard deviation of a random variable X is 20 and a random sample of size n =17, is…
A: From the provided information, Standard deviation of a random variable X (σ) = 20 Sample size (n) =…
Q: 5. A bolt manufacturer makes a type of bolt to be used in airtight containers. The manufacturer…
A:
Q: If the random variable X distributed according to the normal distribution with known variance = W ,…
A:
Q: If x represents a random variable with mean 110 and standard deviation 14, then the standard…
A: If x represents a random variable with mean 110 and standard deviation 14. μ=110σ=14 sample…
Q: 5. A manufacturer claims that the mean tensile strength of thread A exceeds the average tensile…
A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts. In case…
Q: 8) A soft-drink dispensing machine is said to be out of control if the variance of the contents…
A: Given n=25 Population variance=1.15 Sample variance=2.03
Q: busy restaurant on Wednesdays follows a Normal distribution with mean 4,365 and standard deviation…
A:
Q: A population has a variance of 867. We take a random sample of size 47 from this population. Let…
A:
Q: If x represents a random variable with mean 117 and standard deviation 40, then the standard…
A: Given : Mean , u = 117 standard deviation, σ = 40
Q: 11. Suppose the average lifetime of a certain type of car battery is known to be 60 months. Consider…
A: The objective of this question is to calculate the probability of a type II error (failing to reject…
Q: 1.A research conducted by a dietitian indicates that running increases the lifespan among African…
A: In hypothesis testing, there are always two hypotheses. These are null and alternative hypotheses.…
Q: The average running times of disks produced by Company X is 88.1 minutes and a standard deviation of…
A: Normal Distribution: A continuous random variable X is said to follow Normal distribution with…
Q: The number of customers served at a busy restaurant on Wednesdays follows a Normal distribution with…
A:
Q: Suppose that replacement time for washing machines are normally distributed with mean 9.3 years and…
A:
Q: a) If we take a random sample of size 17 from this population distributi for wind speeds what…
A: Given: Mean, μ=13.7 Standard deviation, σ=5.8 (a) Sample size, n = 17 If a random sample of size 17…
Q: Assume that all of a company’s job applicants must take a test, and that the scores on this test are…
A: The scores of the test taken by the company’s job applicants have a normal distribution.If the…
Q: If a population of scores is normally distributed and if samples taken from this population have a…
A: Given : If a population of scores is normally distributed and if samples taken from this population…
Q: 4. Researchers working for a sports drink company would like to if its popular sports drink can help…
A: Given: n= 20.0 ,x̄= 270.0 ,s= 20.0 µ= 300.0 ,significance level(∝)= 0.05 ,degree of freedom= 19.0…
Q: c) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: There are two independent samples which are active and inactive African men. We have to test whether…
Q: c) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: Given information: x¯1-x¯2=34%s12=110.25%s22=104.04%n1=31n2=31
Q: A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: Solution: LetX1 be the lifespan of active African men and X2 be the lifetime of inactive African…
Q: A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: Given information: x¯1-x¯2=34%s12=110.25%s22=104.04%n1=31n2=31
Q: c) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: In hypothesis testing, there are always two hypotheses. These are null and alternative hypotheses.…
Q: A certain mutual fund invests in both U.S. and foreign markets. Let x be a random variable that…
A: A) Using the central limit theorem we can say that x has an approximately normal distribution. (As…
Q: The university data center has two main computers. The center wants to examine whether computer 1 is…
A: The null and alternative hypotheses are stated as follows: It is assumed that samples coming from…
Q: C) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that…
A: In hypothesis testing, there are always two hypotheses. These are null and alternative hypotheses.…
Q: 1. The daily waste amount produced from a factory can be modeled with normal distribution with a…
A: Compute the standard deviation by substituting δx=0.15 and μx=12 in the formula: σx=δxμx σx=0.1512…
Q: The number of words in the active vocabulary of children of a particular age is normally distributed…
A: Obtain the minimum number of words the child would have to know to be in the top 2%. The minimum…
Q: Lower limit: Upper limit:
A: Given: Level of significance = 0.01 Populations are normally distributed with equal variances.…
Suppose that a study is carried out on the performance of the companies WM and TX for which two independent random samples of size 12 of the daily returns are taken for each of the companies. It is assumed that the returns have a
a) Calculate the
b) What is the minimum
Step by step
Solved in 2 steps
- c) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that running increases the lifespan among African men. The mean lifespan of 31 African men runners was 34.0% more than the mean lifespan of 31 inactive African men, with variances reported to be 110.25% and 104.04%, respectively. Assuming the populations to be approximately normally distributed with equal variances. i) Can you conclude that there is a significant increase in the lifespan of the men runners over the inactive men at a = 0.05? ii) Construct a 95% confidence interval for μ₁-M₂-Suppose an airline claims that its flights are consistently on time with an average delay of at most 15 minutes. It claims that the average delay is so consistent that the variance is no more than 15 minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the delays for his next 25 flights. The average delay for those 25 flights is 22 minutes with a standard deviation of 15 minutes.Given two normally distributed populations with equal means and variances of 100 and 80, what is the probability that samples of size n1 = 25 and n2 = 16 will yield a value of mean "x1 - "x2 greater than or equal to 8?
- 4. It is known that the average weight of babies born in a maternity ward is 3.2 kg and the variance of 0.09 kg 2corresponds to the normal distribution. According to this; a) Assuming that an average of 200 babies are born a day, how many of these babies weigh more than 4 kg? b) What weight is the lightest 5% lighter than babies?3) A professor claims that the final exam grades are more widely dispersed in Principles classes compared to upper-level classes. In a sample of 101 Principles final exams, the standard deviation is 16 while in a sample of 30 upper-level class final exams the standard deviation is 13. Test the hypothesis at the 10% level of significance that the 2 variances are different.The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2 . A random sample of 12 processing times from computer 1 showed a mean of 69 seconds with a standard deviation of 19 seconds, while a random sample of 15 processing times from computer 2 (chosen independently of those for computer 1 ) showed a mean of 59 seconds with a standard deviation of 17 seconds. Assume that the populations of processing times are normally distributed for each of the two computers and that the variances are equal. Construct a 95% confidence interval for the difference −μ1μ2 between the mean processing time of computer 1 , μ1 , and the mean processing time of computer 2 , μ2 . Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your responses to at least…
- c) A research conducted by SSTA022 Class representative at the University of Limpopo indicates that running increases the lifespan among African men. The mean lifespan of 31 African men runners was 34.0% more than the mean lifespan of 31 inactive African men, with variances reported to be 110.25% and 104.04%, respectively. Assuming the populations to be approximately normally distributed with equal variances. i) Can you conclude that there is a significant increase in the lifespan of the men runners over the inactive men at a = 0.05? (6)Suppose a random sample of size 1000 is selected from a large population where the population mean is 470 and the population standard deviation is 25 find the standard error of the mean of the sampling distribution round answer to four decimal placesThe university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2. A random sample of 12 processing times from computer 1 showed a mean of 67 seconds with a standard deviation of 20 seconds, while a random sample of 11 processing times from computer 2 (chosen independently of those for computer 1) showed a mean of 70 seconds with a standard deviation of 16 seconds. Assume that the populations of processing times are normally distributed for each of the two computers and that the variances are equal. Construct a 90% confidence interval for the difference u, -4, between the mean processing time of computer 1, µ,, and the mean processing time of computer 2, µ„. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your responses to at least two decimal places. (If necessary,…
- 1. (No computer output is accepted) The running time of films of a company (in minutes) has a normal distribution with a mean of 120 mins and a variance of 9 mins?. a) Calculate the probability that a randomly selected film has a running time less than 110 minutes. b) Calculate the probability that a randomly selected film has a running time greater than 125 minutes. c) Calculate the probability that a randomly selected film has a running time between 115 minutes and 127 minutes.A research conducted by SSTA022 Class representative at the University of Limpopo indicates that running increases the lifespan among African men. The mean lifespan of 31 African men runners was 34.0% more than the mean lifespan of 31 inactive African men, with variances reported to be 110.25% and 104.04%, respectively. Assuming the populations to be approximately normally distributed with equal variances.i) Can you conclude that there is a significant increase in the lifespan of the men runners over the inactive men at ? = 0.05? ii) Construct a 95% confidence interval for ?1 − ?2.The university data center has two main computers. The center wants to examine whether computer 1 is receiving tasks that require processing times comparable to those of computer 2 . A random sample of 14 processing times from computer 1 showed a mean of 54 seconds with a standard deviation of 20 seconds, while a random sample of 9 processing times from computer 2 (chosen independently of those for computer 1 ) showed a mean of 61 seconds with a standard deviation of 19 seconds. Assume that the populations of processing times are normally distributed for each of the two computers and that the variances are equal. Construct a 95% confidence interval for the difference −μ1μ2 between the mean processing time of computer 1 , μ1 , and the mean processing time of computer 2 , μ2 . Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your responses to at least two decimal places. (If necessary, consult a…
