Suppose a multiple choice test contains 40 questions. If each question has 5 answer choices only one of whichis correct, what is the expected number of questions to be answered correctly by guessing?The SAT used to penalize wrong answers by subtracting 1/4 a point from each incorrect answer. If eachquestion on the SAT has 5 answer choices only one of which is correct, what is the expected number of pointsawarded by guessing on 40 questions?

Answered: Image /qna-images/answer/74a37377-8ab7-426e-801f-6097b99ed08e.jpg

Answered: Suppose a multiple choice test contains…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Lilo wants to know if equal proportions of students in her class know how to surf well, know how to surf a little or do not know how to surf. She randomly samples 60 students in her class and asks them if they know how to surf. Twenty students indicate that they do not know how to surf 'don't know', while 30 students indicate they know how to surf well 'know well,' and 10 students indicate they know how to surf ‘a little’. State the hypothesis being tested by Lilo (H0 and HA)? Test Lilo's hypothesis at α of .05. Enter the test statistic, critical value, and decision as part of your answer. Test statistic = Critical value = Do you reject or retain the null hypothesis that the slope is not different from zero? (Enter "Reject" or "Retain"):
On a 20 question multiple choice test, if there are 5 possible responses for each question and you randomly guess on every question, how many can you expect to get right? Thank you!
The reaction times of ten subjects was measured. The median reaction time was 3.7s seconds. The reaction times of nine of the subjects were 3.5s, 3.5s, 3.5s, 3.6s, 3.7s, 3.8s, 3.8s, 3.9s, 3.9s. Was the tenth reaction time?
A consumer agency wants to determine which of two laundry detergents, A or B, cleans clothes better. Fifty pieces of fabric are subjected to the same kinds of stains (grass, mud, coffee). Then 25 pieces are randomly assigned to be cleaned with detergent A and the remaining 25 pieces are cleaned with detergent B. After being laundered, the pieces of fabric are rated on a scale from 1–10, with 1 being the least clean to 10 being the most clean. The difference in mean ratings (A – B) was determined to be 1.5. Assuming there is no difference in the two detergents, 200 simulated differences in sample mean ratings are displayed in the dotplot. Using the dotplot and the difference in mean ratings from the samples, is there convincing evidence that the one detergent is better than the other? Yes, because a difference in mean rating of 1.5 or more occurred only 23 out of 200 times, meaning the difference is statistically significant and there is convincing evidence that A is more effective…
What are the two types of incorrect decisions?
Work this problem involving a true/false and multiple choice test. Assume that the test has 7 true/false questions, and 11 muiltiple choice questions (3 options per questions), each with exactly one correct answer. If a student guesses randomly on each question, what is her expected score?
8 students took a test. 3 of them scored 4, 4 and 7 marks respectively. Given that the median and mode is 5, the upper quartile is 8 and the largest score is thrice the smallest score, find the scores of the other 5 students.
A survey was conducted at University where 80 students were randomly asked whether they liked hamburgers or spaghetti for their snacks. 52 of the students say they like hamburgers, 40 like spaghetti and 10 do not like either of the hamburger or spaghetti. How many students like only hamburger or only spaghetti?
The mean of 5 numbers is 20. If one number is excluded their mean is 15. Then the excluded number is O a. 20 Ob. O b. 40 О с. 5 O d. 10
A consumer group wanted to determine if there was a difference in customer perceptions about prices for a specific type of toy depending on where the toy was purchased. In the local area there are three main retailers: W-Mart, Tag, and URToy. For each retailer, the consumer group randomly selected 5 customers, and asked them to rate how expensive they thought the toy was on a 1-to-10 scale (1= not expensive, to 10 = very expensive). The toy was priced the same at all retail stores. 1. What kind of statistical test should be used to test the consumer group's research goal, assuming that the researcher wanted to use the 1-to-10 scale as a numerical interval measure? A. Repeated-measures t-test B. One-way Independent Measures ANOVA C. Repeated-measures ANOVA D. Independent-measures t-test 2. State the hypothesis that aims to test the consumer group’s research goal (i.e., what is H0 and HA).
Professor Ramos will participate in the lottery that will be played by 500 participants he buys a ticket for 5 dollars.the lucky randomly selected winner will get 100 dollars as a prize what would Ramos expected winnings or losses be. Show your calculations and interpret your results

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