week-10-practice-quiz-with-explanation-and-correct-answer

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Pop. Mean Stand. Dev. Sample size 1 73.00 10.00 6.00 14 2 62.50 8 1.Independent random samples are selected from two populations. Below are selected summary statistics. (a) Construct the 95% confidence interval for μx-µY. (b) Obtain the P-value for the alternative µx =µY.

Calculate the range, population variance, and population standard deviation for the following data set. If necessary, round to one more decimal place than the largest number of decimal places given in the data. 12, 12, 12, 12, 12, 12, 12, 12, 12, 12

2 3 Lunch Spending ($) = x; 28 10 1 15 5 8 606 7 10 618 Z-Scores

Hello! I need help with the following stats questions. 1. What is a confidence interval? 2. What is a confidence coefficient? 3. What do statisticians mean by the term accuracy?

10. Student A in our class ECON 2210 tried to estimate the average marks of the midterm held in March, 2022. Based on a random sample of 30 students' marks and with a 95% confidence level, the student arrived at an interval estimate for the average marks of between 50 and 80. (a) After receiving this result, student B in the same class claimed that there was a 95% chance that the true average marks of the midterm were between 50 and 80. How would you respond to this statement? Is it correct? Why or why not? (b) Student C in the same class did not agree with student B and he claimed that there was a 95% chance that the true average marks of the next midterm were between 50 and 80. How would you respond to this statement? Is it correct? Why or why not?

Supposed a study using a random sample of postgraduate students in Sydney found that the average amount of time spent using a mobile phone per day is 5.5 hours. Indicate whether the quantity described above is a population parameter or a sample statistic, and write down the notation.      Hints: You may type in how you read the notation, instead of using the symbol itself. E,g. you can write "mu" or "xbar" or "phat" or "rho" or "sigma" for the Greek alphabet or special symbol.

b) A small-town mechanic says that 8% his customers come in for an oil change. When 1000 samples were drawn from his records, it was found that 6.5% of these came in for an oil change. What is the target population? Does the value 8% refer to the parameter or to the statistic? Is the value 6.5% a parameter or a statistic? i. ii. iii.

A teacher gave the same test to two classes. In the class with 50 students, the mean score was 75. In the class with 30 students, the mean was 83. What was the mean score for all students?

1. The manager at Bell's Gym wants to know the proportion of members who use the Cardio Machines. A sample of 260 members showed that 40 of them use cardio machines. Calculate a 97% confidence interval for the proportion of members who use the cardio machines.

Suppose you apply an estimator to sample data and you get an estimate of 5 forwhatever sample you draw from the population. Is this estimator the most efficient because itsvariance is zero? Why or why not?

Focusing on government spending as a percentage of GDP in the U.S., we observed that between 1820 and 1929 the: minimum value was 3.13%; mean value was 6.83%; and maximum value was 29.03%. In contrast, between 1930 and 2021 , the a) None of the above answers are correct. B) maximum value was 10.94%.c) minimum value was 2.12%. D) mean value was 30.56%. Note:- Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. Answer completely. You will get up vote for sure.

(Ch8) True or False? With a given sample, when we lower the confidence level, it will reduce the width of a confidence interval of the population proportion.

Assuming normality, contruct and interpret a 90% confidence interval for the average monthly earning from Toyota Vehicles.

Each of a sample of 176 residents selected from a small town is asked how much money he or she spent last week on state lottery tickets. 130 of the residents responded with $0. The mean expenditure for the remaining residents was $21. The largest expenditure was $210. Step 3 of 5: What is the mode of the data?

18 We can make a confidence interval more precise (narrower) by, a increasing the sample size.       b reducing the confidence level.       c increasing the confidence level.       d both (a) and (b) are correct.

Ca = 40 + 0.80 (Y-T) Ig = 30 Xn= 10 T=20 G=20 DI-Y-T

The birthweight (in kg) of 55 babies are tabulated in the frequency distribution below: Birthweight (kg) Class Midpoint Frequency M (1– 1.5| (1.5-2 1.25 6. 1.75 10 (2- 2.5) 2.25 1 (2.5-3) 2.75 15 10 (3-3.5] 3.25 3. (3.5- 4) 3.75 55 Total Calculate the relative frequency of the class interval (2 - 2.5).

Question 1 The distance between the sample mean and the true population is the sampling error, O True False

Is it true or false that the least absolute deviations (LAD) estimator minimizes the sum of the absolute value of the population errors.

a) For each, find the expressions for marginal utilities and the marginal rate of substitution, and determine whether monotonicity and convexity are met.

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please answer fast please arjent help please

Zip Code, Age and Number of Dogs by Person in Petland Person Zip Code Number Age of Dogs Ann 402 20 0 Bill 805 35 55 2 Carmelo 805 40 5 Dan 402 50 1 Eric 402 20 20 Ferdinand 402 35 55 3 3 Gert 402 20 2 Homer 402 20 0 In-choi 805 100 3 Jimmy 805 60 1

Manufacturers of tires report that car tires should be able to last an average of 50,000 miles. A new tire company produces a different type of tread and tests 100 randomly selected tires. This sample of 100 tires lasted an average of 51,500 miles. Assuming the new type of tread does not improve the mileage of the tire, 200 sample means were simulated and displayed on the dotplot. Simulated Tire Mileage +++ +++H 47,000 48,000 49,000 50,000 51,000 52,000 53,000 Mean mileage Using the dotplot and the sample mean mileage, is there convincing evidence that the new type of tread improves the mileage of the tire? Yes, because a mean mileage of 51,500 or more occurred only 14 out of 200 times, the mean mileage is statistically significant. There is convincing evidence the new type of tire tread improves mileage of the tire. Yes, because a mean mileage of 51,500 or less occurred 186 out of 200 times, the mean mileage is statistically significant. There is convincing evidence the new type of…

Question: In a certain factory there are two independent processes manufacturing the same item. The average weight in a sample of 250 items produced from one process is found to be 120 ozs. with a standard deviation of 12 ozs. while the corresponding figures in a sample of 400 items from the other process are 124 and 14. Obtain the standard error of difference between the two sample means. Is this difference significant ? Also find the 99% confidence limits for the difference in the average weights of items produced by the two processes respectively.

10. 7 students were asked how many pencils they had. The responses were 2, 5, 8, 3, 1, 6, and 4. a. Calculate the sample mean 8. Find the sample standard deviation C Find the Q1, Q3, and the interquartile range.