Independent random samples of n₁ 1,265 and n₂=USE SALT1,618 observations were selected from binomial populations 1 and 2, and X₁= 869 and X2= 980 successes were observed.(a) Find a 99% confidence interval for the difference (P₁-P₂) in the two population proportions. (Round your answers to three decimal places.)X to

Answered: Independent random samples of n₁ =…

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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for a two tailed test, if z=2.04, find the p value
Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
19A) Solve the following using Statistic materials: A) A student takes a 10-question multiple-choice exam, but did not study and randomly guesses each answer. Each question has three possible choices. Find the probability that the student guesses 50% correct. B) It is known that 15% of the seniors in a large high school enter military service upon graduation. If a group of 20 seniors are randomly selected, what is the probability of observing at least two who will be entering military service? C) It has been estimated that only about 30% of California residents have adequate earthquake supplies. Suppose you randomly survey 11 California residents. We are interested in the number who have adequate earthquake supplies. Is it more likely that none or that all of the residents surveyed will have adequate earthquake supplies? Explain why using mathematical justification.
A sample of 8 adult elephants had an average weight of 12,300 pounds. the standard deviation for the sample was 22 pounds. find the 95% confidence interval of the population mean for the weights of adult elephants. (the t distribution, table F, must be used for the confidence interval.)
A simple random sample of size n=40 is drawn from a population. The sample mean is found to be x=120.5 and the sample standard deviation is found to be s=13.4. Construct a 99% confidence interval for the population mean. What is the lower and upper bound?
A researcher has obtained the following scatter plot depicting the relationship between Y and X. On the graph, you can see three possible regression lines, which have a common y-intercept of bo = 35.48. Lines A, B and C cross the y-axis at coordinates (52, 106.78), (52, 66.52) and (52, 36.67), respectively. Given the confidence interval is (0.333, 1.122), choose the correct answer(s). rise Hint: Calculate slope of each line using known formula slope = run 35.48 0 Line A Line B Line C O O O 60 X 8 00 52 106.78 66.52 36.67 Select one or more: ✔a. The slope of Line A is within the confidence interval. ✓b. The slope of Line B is within the confidence interval. ✓ C. The slope of Line C is within the confidence interval.
As a bonus assignment a former student checked if your professor gave a statisticallysignificant difference in grades between his male and female students. She based herstudy based on grades assigned in intermediate Econ courses (Econ 303, 305 and 317)and her sample included nm = 485 male students and nf = 264 female students. Theaverage grades received were xm = 84.6 and xf = 85.8 The population standad deviation were σ m = 12.0 and σ f = 11.4 8. From the same extra-credit study as in question 7 see above, this former student found that the proportion of female students in principle courses (Econ 203, 205) was ?̅? = 0.380, while the proportion of female students in intermediate courses (Econ 303, 305, 317) was ?̅? = 0.352. The principle courses sample size was np = 782, while the intermediate courses sample size was ni = 749. Test the hypothesis that female students are less in intermediate courses using a 90% confidence level and the p-value approach.
Answer A through d
J 2
A sample of n = 7 scores is selected from a population with an unknown mean ( µ). The sample has a mean of M = 40 and a variance of s 2 = 63. Which of the following is the correct 95% confidence interval for µ?
A researcher reports t(22) = 5.30, p < .01 for an independent-measures experiment. How many individuals participated in the entire experiment? Question 15 options: 20 21 23 24
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