If an item is administered to 100 individuals has a difficulty index of 0.20, this item has a variance of(a)_. This suggests that the item regroups the individuals into two groups: a group composed of_(b)people having correctly responded to the item in question and another group of (c)_people_ not havingcorrectly responded to the item.

The number of people to whom the item is administered = 100 that is n = 100 The difficulty index is…

Answered: If an item is administered to 100…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The culinary herb cilantro, Coriandrum sativum, is very polarizing: some people love it and others hate it. A genetic component is suspected in this phenomenon. A survey of American adults of European ancestry found that 1129 of 7295 women and 865 of 7309 men said that cilantro tastes soapy. We want to know if women and men in this population differ in how they perceive the taste of cilantro. What is the pooled sample proportion of women and men who say that cilantro tastes soapy? Conduct a hypothesis test, and state the test statistic and p-value and give the conclusion. How much differ? Construct a 95% confidence interval for the difference of the proportions of women and men who say that cilantro tastes soapy. Interpret your interval in the context.
During the exam you will be using a sample of 500 adults with the following variables: ● genhelf - variable recording general self-reported health coded 1 = very good, 2 = good, 3 = fair, 4 = poor ● sbp - variable recording systolic blood pressure age - age of the respondent in years • sex-coded 1 = male and 2 = female ● hi_sbp - indicator of high blood pressure coded 1 if the respondent's sbp is 130 or higher and 0 otherwise What type of variable is genhelf? O Discrete Continuous Nominal O Ordinal
ific Calculator Of30shg/ckivdfk1p00003g5tgeftOid1 Agroup of researchers in New York wants to test if there is any relationship between living in California and preferring warm weather to cold weather. The researchers send out an online questionnaire to 200 randomly chosen people in the US asking several questions including: "Do you live in California?" and "Do you prefer warm weather to cold weather?". The results are summarized in the table below: Prefers Warm Weather 80 Prefers Cold Weather 42 Lives in California Doesn't Live in California 35 43 Test the null hypothesis that the choices on these two questions are independent versus the alternative that they are dependent. What are the p-value and conclusion of this test if the test is performed at the alpha =0.1 level? %3D p-value = 0.0091; Fail to reject the null hypothesis %3D p-value = 0.0039; Reject the null hypothesis p-value = 0.0039; Fail to reject the null hypothesis p-value = 0.0911; Reject the null hypothesis NEXT
Out of the attacks that took place in 2018, was the mean number of fatalities greater in bombing/explosion attack types than in all other attack types? i need to come up with a correct statistical test to test this research based on the data that i gathered i have this. i gathered a sample of 80 ATTACKS. 33 of the attacks were sucessful attacks using BOMBINGS/EXPLOSIONS 35 of them were sucessful attackd by all other types of attacks need a way to use a statistical research method
According to IT department of leading financial firm, 50% of emails received by their employees are spam. They are planning to install a software which filters the spam emails. A reputable cybersecurity brand has launched a software which claims to detect 99% of spam emails. However, they have also reported 5% as the chance of detecting a non-spam email as spam. If an email is detected as spam, what is the probability of it in fact being a non-spam email?
please do everything correct!! i will upvote!!
Suppose that a health researcher is interested in determining whether the distance between the patient’s residence and source of care, and # of disability days significantly predict the number of visits at a local hospital. At the 5% significance level, determine if # of disability days and distance between patient’s residence and source of care significantly predict the number of visits. Visits Distance Disability days 7 1 8 7 1 9 2 10 1 4 4 3 5 2 5 3 9 2 2 10 1 9 2 10 6 3 7 2 11 2 4 2 3 7 2 8 3 14 2 2 16 1 8 2 9 4 4 2 6 2 5
Suppose that Kim is a participant in a study that compares several coaching methods to see how they affect math Scholar Aptitude Test (SAT) scores. The grand mean of math SAT scores for all participants (My) in the study is 550. The group that Kim participated in had a mean math SAT score of 565. Kim’s individual score on the math SAT was 610. What was the estimate residual component 'eij' (of Kim’s score, that is, the part of Kim’s score that was not related to the coaching method? (Both parts of this question call for specific numerical values as answers). What was that “effect” (ai) component of Kim's score?
In the table are the grade distributions of boys who have and have not played video games (a) At the 5% significance level is there sufficient evidence that gaming and grades are dependent (or associated)? (b) Association does not prove causation. Explain why you can’t conclude from this study that playingvideo games improves grades for boys.

Recommended textbooks for you

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

MATLAB: An Introduction with Applications

Statistics

ISBN:

9781119256830

Author:

Amos Gilat

Publisher:

John Wiley & Sons Inc

Probability and Statistics for Engineering and th…

Statistics

ISBN:

9781305251809

Author:

Jay L. Devore

Publisher:

Cengage Learning

Statistics for The Behavioral Sciences (MindTap C…

Statistics

ISBN:

9781305504912

Author:

Frederick J Gravetter, Larry B. Wallnau

Publisher:

Cengage Learning

Elementary Statistics: Picturing the World (7th E…

Statistics

ISBN:

9780134683416

Author:

Ron Larson, Betsy Farber

Publisher:

PEARSON

The Basic Practice of Statistics

Statistics

ISBN:

9781319042578

Author:

David S. Moore, William I. Notz, Michael A. Fligner

Publisher:

W. H. Freeman

Introduction to the Practice of Statistics

Statistics

ISBN:

9781319013387

Author:

David S. Moore, George P. McCabe, Bruce A. Craig

Publisher:

W. H. Freeman

SEE MORE TEXTBOOKS