What is the expected sign of the critical value(s) for a two-tailed hypothesis test?Select one:O a. negativeO b. both positive and negativeO c. positiveO d. cannot be determined

Answered: What is the expected sign of the…

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 this problem, assume that outcome O1has frequency 1/a, outcome O2 has frequency 10/a and outcome O3 has frequency 8/a What is the value of a
Match each Test Situation with the correct Critical Value. For a two-sided test, find only the positive value. Test Situation Ha: P1 P2 + 0 and a = 0.001 Ha:Pi – P2 7 0 and a = 0.02 Ha:P1 – p2 0 and a = 0.005 Ha: P1 – P2 > 0 and a = 0.04 Critical Value a. 1.751 b. 2.326 с. 2.576 d. -1.960 е. 3.291
An SAT prep course claims to improve the test score of students. The table below shows the scores for seven students the first two times they took the verbal SAT. Before taking the SAT for the second time, each student took a course to try to improve his or her verbal SAT scores. Do these results support the claim that the SAT prep course improves the students' verbal SAT scores? Let d = (verbal SAT scores prior to taking the prep course)-(verbal SAT scores after taking the prep course). Use a significance level of α = 0.05 for the test. Assume that the verbal SAT scores are normally distributed for the population of students both before and after taking the SAT prep course. Student 1 2 3 4 567 Score on first SAT 380 440 470 490 440 Score on second SAT 420 530 530 550 460 420 410 490 430 Step 1 of 5: State the null and alternative hypotheses for the test. Answer 0 Ho: Md 0 Ha IVA A VI Copy Data Tables Keypad Keyboard Shortcuts
A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of n = 9 college students is obtained and each student’s performance on a familiar video game is measured before and after eating a traditional Thanksgiving dinner including roast turkey. The average score dropped by M = 14 points after the meal with SS = 1152 for the difference scores. A. Is there is significant difference in performance before eating versus after eating? Use a two-tailed test with α = .05. SMD = ___________________________ tcritical = ________________________ tcalculated = ________________________ Decision = _______________________ B. Compute r2 to measure the size of the effect. r2 = _____________________________ C. Write a sentence demonstrating how the outcome of the test and the measure of effect size would…
A special diet is fed to adult turkeys to see if they will gain weight. The before and after weights in pounds are shown. At α= 0.05, test the claim to see if the diet results in a higher weight. Before 28 24 29 30 32 33 25 26 28 After 30 29 31 32 32 35 29 25 31 A. What is the test statistic? B. What is the critical value?
Indicate for each which type of t test is appropriate (independent, dependent). An educator would like to assess the effectiveness of a new instructional program for reading. The control group consist of n= 4 second grade students who are provided with the traditional instruction used at school. Later these students are given the experimental instruction and measured again on reading.
Fill in the blanks in the following source tables... Is F significant? If it is significant, at what alpha level?
Are Republicans less likely than Democrats to display the American flag in front of their residence on the Fourth of July? 409 of the 660 Republicans surveyed display the flag on the Fourth of July and 472 of the 687 Democrats surveyed display the flag on the Fourth of July. What can be concluded at the a = 0.05 level of significance? For this study, we should use Select an answer a. The null and alternative hypotheses would be: Ho: Select an answer v Select an ahswer vSelect an answer v (please enter a decimal) H1: [Select an answer Select an answer v Select an answer v (Please enter a decimal) b. The test statistic ? v (please show your answer to 3 decimal places.) !! c. The p-value (Please show your answer to 4 decimal places.) d. The p-value is ? va e. Based on this, we should Select an answer v the null hypothesis.
The management of the local zoo wants to know if all of their animal exhibits are equally popular, If there is significant evidence that some of the exhibits are not being visited frequently enough, then changes may need to take place within the zoo. A tally of visitors is taken for each of the following animals throughout the course of a week, and the results are contained in the following table. At a = 0.10, determine whether there is sufficient evidence to conclude that some exhibits are less popular than others. Animal Exhibits at the Zoo Elephants Lions/Tigers Giraffes Zebras Monkeys Birds Reptiles Number of 128 161 162 128 165 163 132 visitors Copy Data Step 1 of 4: State the null and alternative hypotheses in terms of the expected proportion for each animal exhibit. Enter your answer as a fraction or a decimal rounded to six decimal places, if necessary. Ho P = H Some exhibits are less popular than others. The management of the local z00 wants to know if all of their animal…
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1st Class 2nd Class 3rd Class Perished 117 163 526 Survived 187 112 186 Total 304 275 712 The table contains data on the survival numbers for passengers by known ticket class for the RMS Titanic when it sunk. Does this data suggest that ticket class and survivability were dependent using α = 0.01?

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What is the expected sign of the critical value(s) for a two- Select one: O a. negative O b. both positive and negative O c. positive O d. cannot be determined