A lumber company is making boards that are 29432943 millimeters tall. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 1414 boards is made, and it is found that they have a mean of 2940.52940.5 millimeters with a variance of 144144. Is there evidence at the 0.0250.025 level that the boards are too short and unusable? State the null and alternative hypotheses for the above scenario

Q: School district (group 1) compared to the Beaverton School district (group 2). Assume the ations are…

A: Given Group 1 n1=26 Xbar1=33 S1=6 Group 2 n2=25 Xbar2=36  S2=2

Q: An office manager claims that the mean time required to handle a customer complaint is less than 30…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: Assume a researcher recruits 150 African American and Caucasian individuals taking warfarin to…

A: Given: n1 = 75 X1 = 6.1 S1 = 1.7 n2 = 75 X2 = 4.3 S2 = 0.9 Sp = 1.10 Formula Used: Sp =…

Q: Find a 99% confidence interval in the difference of the means. Use technology to find the critical…

A:

Q: An analysis of variances produces dftotal = 29 and dfwithin = 27. For this analysis, what is…

A: Given information- We have to find-

Q: A population of Senior High School consits of number 1,2,3,4 and 5 .Compute the mean ,variance and…

A:

Q: Suppose samples are taken from a population of heifers with known mean and standard deviation of…

A:

Q: By what numerical value should SS be divided in order to compute an unbiased variance?

A: The variance is obtained using ratio of squared deviations and sample size.

Q: A supplier sells ropes. He claims that the ropes have a mean strength of 34 pounds and a variance of…

A:

Q: A school administrator wants to see if there is a difference in the number of students per class for…

A: using excel we find critical value

Q: 32 students from Batangas National High school shows a mean 1Q of 111 while 30 students from…

A: We want to test the hypothesis

Q: If the number of dust particles in a square meter on a surface follows a Poisson distribution with a…

A:

Q: A lumber company is making doors that are 2058.0 millimeters tall. If the doors are too long they…

A: Population mean, μ = 2058.0 millimeters Sample mean,  = 2044.0 millimeters Sample size, n = 20…

Q: For its "Music 360" survey, Nielsen Co. asked teenagers and adults how each group has listened to…

A: Solution

Q: Data is collected to compare two different types of batteries. We measure the time to failure of 10…

A: Given that, Mean1, X1 bar= 8.65 Mean2, X2bar=11.23 Variances are equal so standard deviations will…

Q: stimated that only 2% of high school athletes receive even a partial athletic scholarship to…

A: Given data,p=2% =0.02n=500Find variance and standard deviation?

Q: 12) If the standard deviation of a data set is (17.2); the variance will be (295.84).   Select…

A:

Q: Suppose you want to find if there is any diffference between the mean (average) lifetime of two…

A:

Q: A school administrator wants to see if there is a difference in the number of students per class for…

A: The confidence interval measures the range where the true parameter occurs. It has two parts, they…

Q: 9. 32 students from Batangas National High school shows a mean IQ of 111 while 30 students from…

A: Given Data : For Sample 1 x̄1 = 111.0 σ1 = 64 =  8.0 n1 = 32 For…

Q: Highway engineers in Ohio are painting white stripes on a highway. The stripes are supposed to be…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

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: An analysis of variances produces dftotal = 35 and dfwithin = 32. For this analysis, what is…

A: A one-way analysis of variances produces dftotal = 35 and dfwithin= 32. For this analysis, what is…

Q: A school administrator wants to see if there is a difference in the number of students per class for…

A: The confidence level is 99%. The degrees of freedom is 40.3378. Computation of critical value: The…

Q: a. With two hard disk drives, the probability that catastrophe can be avoided is (Round to four…

A: here use binomial distribution  each trial independent(failure of disk indpendent) finite number of…

Q: An article about “Relative Controllability of Dissimilar Cars” reported a study in which 14 subjects…

A: sample mean, x = 1.21 sample variance = 160.7824 sample standard deviation, s = 160.7824 = 12.68…

Q: A simple random sample of heights of 6400 Englishmen has a mean of 67.85 inches and SD 2.56 inches,…

A: Since the sample size is large so we can assume normality.Null hypothesis: H0: Australians are same…

Q: Assuming that the height of male students in a large university is normally distributed with mean…

A: Mean is given to be μ=172.7 and standard deviation is σ=57.76=7.6 The sample mean μx=μ=172.7…

Q: Give a 99.8% confidence interval, for ₁ - 2 given the following information.

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A lumber company is making boards that are 2777.0 millimeters tall. If the boards are too long they…

A: We have to find test statistic. Formula : t = x¯ -μsn Where , x¯ is sample mean. s is sample…

Q: Suppose a researcher pbserves a population of 12 people and computes SS=204. What is the variance?…

A: The population size is N=12. The sum of squares is SS=204. Need to obtain: the variance and the…