Assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) find the criticalvalue tx/2, (b) find the critical value Zα/2, or (c) state that neither the normal distribution nor the t distribution applies.40-30-20-The confidence level is 99%, o is not known, and the histogram of 67 player salaries (in thousands of dollars) of footballplayers on a team is as shown.10-0-CSelect the correct choice below and, if necessary, fill in the answer box to complete your choice.OA. ta/2=(Round to two decimal places as needed.)O B. Za/2=(Round to two decimal places as needed.)O C. Neither the normal distribution nor the t distribution applies.T4000 8000 12000 16000 20000Salary (thousands of dollars)

The number of player salaries (n) is 67.

Answered: 40- Assume that we want to construct a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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I have only 30 min. Please help
One scientist wondered if there was a difference in the average daily intake of dairy products between men and women. He took a sample of n1 = 50 adult men and n2 = 50 adult women and recorded their daily intake of dairy products in grams per day. A summary of the sample results is presented in the table. Construct a 95% confidence interval for the difference in the average daily intake of dairy products for men and women. Can it be concluded that there is a difference in the average daily intakes for men and women?
If n=-22, (x-bar)=50, and s-6, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.
The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the two rear wheels of eight cars and runs the cars until the tires wear out. The data (in kilometers) follow. Find a 99% confidence interval on the difference in the mean life. Car Brand 1 Brand 2 1 36,925 34,318 2 45,300 42,280 3 36,256 35.548 4 32,100 31,950 5 37,210 38,015 6 48,360 47,800 7 38.200 37,810 8 33,500 33,215 Round your answer to 2 decimal places. Do not use commas.
If N = 25, ?̅= 135, s = 24 and assuming that the population is normally distributed,construct a 95% confidence interval estimate for the population mean.
Do AP Statistics students have higher GPA's than non AP Statistics students? Random samples of 20 AP Statistics students and 20 non AP Statistic students were taken. AP Statistics students had a mean GPA of 3.335 with a standard deviation of 0.557. Non AP Statistics students had a mean GPA of 3.04 with a standard deviation of 0.685. Assume the distribution of all AP Statistics scores are normally distributed. Use a 95% confidence interval for the true difference in average GPAS for AP Statistics and non AP Statistics students to determine if one group has a higher GPA than the other.
A chemical engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 15 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are i = 60,139.7 ands = 3645.94 kilometers. Find a 99% confidence interval on the mean tire life. Which t-distribution curve applies on the 99% confidence interval? Include your solution. O a. 57,336 sH S 62,914 O d. 57,337 Su S 62,942 t-2.947 O b. NONE O. 57,337 sH S 62,94
Helga is researching the IQ of a particular monkey species. She measured the IQ in 15 monkeys with a special monkey IQ test and it turned out to be 120 points on average. The standard deviation was 12 points. It can be assumed that the IQ follows a normal distribution. What is the upper limit of the 95% confidence interval for the average monkey species index?
Suppose a new standardized test is given to 108 randomly selected third-grade students in New Jersey. The sample average score Y on the test is 62 points, and the sample standard deviation, sy, is 10 points. The authors plan to administer the test to all third-grade students in New Jersey. The 95% confidence interval for the mean score of all New Jersey third graders is (.). (Round your responses to two decimal places.) Suppose the same test is given to 216 randomly selected third graders from lowa, producing a sample average of 66 points and sample standard deviation of 13 points. The 90% confidence interval for the difference in mean scores between lowa and New Jersey is -6.22.). (Round your responses to two decimal places.) The p-value of the test of no difference in means versus some difference is 0.0024. (Round your response to four decimal places.) Can you conclude with a high degree of confidence that the population means for lowa and New Jersey students are different? OA.…
The interval [40 50] represents a 90% confidence interval for a population mean. Which of the following is most likely to be the corresponding 95% confidence interval? (Hint: in a normal distribution, close to 90% of the values are within 1.65 standard deviations of the mean and close to 95% of the values are within 2 standard deviations of the mean) O A. [42 48] В. [36 54] OC. [40 54] D. [30 60]
10. We had two experimental conditions, each with 10 participants Set up a 99% confidence interval for the difference using the data below. Report your final answer for each question using proper APA notation. Write a sentence indicating what your answer means. X = 12.2 SS = 54.8 X = 13.8 SS, = 72,5
Albert, a student of statistics, considered a random sample of the duration of 100 phone calls. He constructed the confidence interval with 95% confidence. Veronica selected her own random sample of 100 phone calls and constructed a confidence interval with 95% confidence. Is it possible that the confidence interval she obtained is different from the one Albert obtained? Explain why or why not. Suppose that they do not have information about the standard deviation of the population

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