A random sample of 12 shearing pins is taken in a study of the Rockwell hardness of the head on the pin. Measurements on the Rockwell hardness were made for each of the 12 , yielding an average value of 48.5 with a sample standard deviation of 1.5. Assuming the measurements to be normally distributed, construct a 90% confidence interval for the mean Rockwell hardness.

Q: You may need to use the appropriate appendix table or technology to answer this question. Consider t...

A:

Q: Can you a modified formula for E(S) and Var(S), where Sis the total claim size,  the number of claim...

A: In the given situation, S represents the total claim size. The number of claims per year follows a N...

Q: The amount of sodium sulfate, in mg, found in the bottled water follows a normal distribution with a...

A:

Q: For the following data, what is SSbetween treatments? ​Treatments Subject        I           II   ...

A: The formula of SS due to treatments is,  

Q: How does statistical methods improve the quality of processes?

A: Statistical methods are used to improve and control the quality of process.

Q: An instructor is administering a final examination. She tells her class that she will give an A to t...

A:

Q: why do we study or use 5 averages in statistics? Elaborate

A: The 5 types of averages we use in statistics are: 1- Arithmetic mean 2-Mode 3- Median 4-Root mean sq...

Q: The accompanying table describes results from groups of 10 births from 10 different sets of parents....

A:

Q: In a family with 10 children the p = probability of a boy = 0.5. Find the binomial exact probability...

A: Givensample size(n)=10probability of a boy(p)=0.5x≅Binomial(n=10,p=0.5)P(X=x)=(nx)×px×(1-p)x    ; x=...

Q: Powerball numbers are drawn from two sets of numbers. Five numbers are drawn from one set of 69 numb...

A:

Q: O b. There is a strong negative correlation between the number of hours spent by the learners in stu...

A: Correlation: Correlation a measure which indicates the “go-togetherness” of two data sets. It can be...

Q: A textile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mea...

A: Given : A textile fiber manufacture is investing a new drapery yarn Company claims that : Claim : Po...

Q: Scores on the Wechsler Adult Intelligence Test are normally distributed with a mean of 100 and a sta...

A: Given:' Mean = μ=100 Standard deviation = σ= 10

Q: Structural Engineers in an iron manufacturing company describe the results of deformation on the nat...

A: Formula :

Q: An international trade commission obtained a random sample of Chinese consumers to determine whether...

A: Given that  We have to conduct Chi square test and find that  Test statistic, Critical value, Decis...

Q: O A. No. The correlation between the expected z-scores and the observed data, does not exceed the cr...

A: z-score is the value decreased by mean, divided by the standard deviation. The z-score for a sample ...

Q: The average time it takes to be vaccinated is 5 minutes with the standard deviation of 1 minute. Wha...

A: The four steps to calculate probability of more than 6 min average time to be vaccinated where mean ...

Q: The function g (x) is shown below. Over which interval does g have a positive average rate of change...

A:

Q: What value for k allows the following f(y) to qualify as a continuous probability function? f(y) 2k ...

A:

Q: mpany that TV network A garnered 31% audience satisfaction. To test the claim, TV network A conducte...

A:

Q: 1. If the joint PDF of X and Y is -1<x<y<1 otherwise c, fxx(x, y) = {6" {o,

A:

Q: A well-known university is interested in how salary (in thousands of dollars) is predicted from year...

A: Given regression equations are : Faculty (n = 170): ŷ = 60 + 1.1x Admin. (n = 155): ŷ = 57 + 1.5x  

Q: During a blood-donor program conducted during finals week for college students, a blood-pressure rea...

A:

Q: Calculate the following by hand. Round values to four decimals places, if necessary r= Regression eq...

A:

Q: 27. An enquiry into the budgers of the middle class families in Mumbai gave the following informatio...

A:

Q: Iilustraiion 19.28. A correlation ;coefficient of 0.2 is obtained from a random sample of 1,600 pair...

A:

Q: Based on the data shown below a statistician calculates a liner model Y= -0.92x +21.65 Use the mode...

A: We have given that,  The mode Y= -0.92X + 21.65 Then,  We will find the y-estimates when x= 1 , x= 2...

Q: G The following table gives the prices and quantities of four commodities A, B. C and D Go the years...

A:

Q: A certain test contains 10 multiple-choice problems. For five of the problems, there are four possib...

A:

Q: What is the value of c given the joint probability density function:

A:

Q: View Policies Current Attempt in Progress The standard deviation for a population is o = 14.3. Asamp...

A:

Q: You may need to use the appropriate appendix table or technology to answer this question. Given are ...

A:

Q: doesn't the mean of a sample population equal the true proportion?

A: Yes, the sample population is equal to true proportion.

Q: A random sample of size 40 was drawn from a normal distribution with the mean 50 and standard deviat...

A:

Q: We are interested in estimating the proportion of graduates at a mid-sized university who found a jo...

A: From the provided information, 340 out of 430 graduates found jobs within one year. Sample size (n) ...

Q: A survey-taker asks the age of each person in a random sample of 20 people. X is the age for the ind...

A:

Q: а) Suppose that Game store in Polokwane donated a lot of 8 computer sets that includes 3 which are m...

A: Given : No. of computer sets (N) = 8 Let Y : No. of defective or malfunctioning computer sets Here Y...

Q: We are interested in estimating the proportion of graduates at a mid-sized university who found a jo...

A:

Q: Suppose that Jerry (a baker) wants to find a 95% Confidence Interval for the mean baking time for al...

A:

Q: Given the data (Xi) and (Yi), we will assume that a regression model Y = B1Xị + E; is appropriate wi...

A: Note: As per the student's request, answer has been provided for Q2. i X Y Y2 X2 XiYi 1 7 128 ...

Q: About locating percentile under the normal curve. Direction: Solve the following.

A: The z score is used to determine the number of deviation from the mean. It is calculated by the comb...

Q: A random sample of 25 books is taken from a publisher's stock.  On average, each sampled book has 30...

A:

Q: If X, Y are normally distributed independent random variables, then show that W = 2X - Y is normall...

A: From the given information, X and Y are normally distributed independent random variables. Let us co...

Q: Given that a random person just tested positive, determine the probability of having this illness.

A: here from given information , define event  having illness = L person tested positive = A person tes...

Q: We are interested in estimating the proportion of graduates at a mid-sized university who found a jo...

A: From the provided information, Sample size (n) = 430 From which 340 graduates found jobs within one ...

Q: The quantities below are calculated from a sample of data set Determine the lease square regression ...

A: We have given that data  Regression equation.  Y^ = a + bx  

Q: The mean water temperature downstream from a discharge pipe at a power plant cooling tower should be...

A:

Q: A restaurant chain's owners are trying to decide if they want to open up a franchise in your town. T...

A: Introduction: It is required to discuss if there is any bias in the sampling method.

Q: A textile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mea...

A: The claim is that the mean thread elongation is 12 kilograms with the standard deviation of 0.5 kilo...

Q: Determine the mean, variance, and the pgf of the zero-truncated Pois: distribution.

A: