8) Suppose you take a 10 question multiple choice test for which there are 5 possibleanswers (exactly one is correct). Suppose you guess on each question. What is theexpected number of correct answers? What is the variance of the number of correctanswers?

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Answered: 8) Suppose you take a 10 question…

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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One thousand customers entering a mall, in a city, were randomly selected and asked to rank the variety of stores. The results are given in the following incomplete table. Response Excellent Very good Good Fair Poor Frequency 50 152 255 Answer: Relative frequency 0.4250 0.1180 What proportion of customers did not rank the store variety as very good or excellent? (Type your final answer in decimal form, like 0.25)
A multiple-choice test contains 10 questions, each with four choices, and you guess at each question. Let X = the number of questions answered correctly(p-0.25) then the probability of guessing two questions is 0.3615 1.32 0.9920 0.2816
A multiple-choice test consists of 27 questions with possible answers of a, b, c, d. Estimate the probability with random guessing, the number of correct answers is at least 13.
Which of the following is the domain of a random variable? Choose the correct answer: a. set of whole numbers b. sample space c. set of real numbers d. subset of the outcomes of the experiment
Each question on a multiple-choice exam has four choices. One of the choices is the correct answer, worth 6 points, another choice is wrong but still carries partial credit of 4 points, and the other two choices are worth 0 points.If a student picks answers at random, what is the expected value of his or her score for a problem? pointsIf the exam has 90 questions, what is his or her expected score?
Find tests statitic and p-score.
Ramos has a spinning wheel. The Spining wheel has 18 blue numbers 18 white numbers and 2 yellow numbers the table provided shows the frequency with which the ball landed on each color in 200 trials. color blue frequency 18 white frequency 18 yellow frequency 2 . At the 5% significance level do the data suggest that the wheel is out of balance?you will need to compute the expected counts to do your calculations remember that the expected counts can be computed with the formula E = np, where n is the number of trials and P is the probability of each color.
A box contains 70% of tickets labeled 1 and 30% of tickets labeled 0. We draw 500 times with replacement from this box. What is the standard error of the sample percentage of 1's? Group of answer choices 0.46% 1.08% 2.05%
You want to see if it makes a difference which lane to be in when there is traffic. You randomly observe 372 cars as they pass by on the four lane freeway. The results are displayed in the table below. Use a level of significance of a = 0.01. a. Complete the rest of the table by filling in the expected frequencies: of Cars in Each Lane Frequency Outcome Frequency Expected Frequency Lane 1 89 Lane 2 98 Lane 3 92 Lane 4 93 b. What is the correct statistical test to use? Select an answer Y C. What are the null and alternative hypotheses? Ho: OThe distribution of traffic is not uniform. O The traffic and lanes are independent. O The distribution of traffic is uniform. KO The traffic and lanes are dependent. Hi : OThe distribution of traffic is uniform. OThe traffic and lanes are independent. O The traffic and lanes are dependent. O The distribution of traffic is not uniform.
ind the number of successes x suggested by the given statement: From a CNN/USA Today/Gallup poll: Among 1299 survey subjects, 13.7 % say that the opinion of a celebrity would influence their own opinion. x = nothing (round off to a whole number)
A die is rolled 120 times to see if it is fair. The table below shows the frequencies for each of the six possible outcomes. Use a level of significance of αα = 0.05. Complete the rest of the table by filling in the expected frequencies (enter your answers in fraction form):Frequency of Dice Values Outcome Frequency Expected Frequency 1 18 2 17 3 25 4 15 5 26 6 19 What is the correct statistical test to use? What are the null and alternative hypotheses?H0:H0: The distribution of die rolls is uniform. The die rolls are dependent. The die rolls are independent. The distribution of die rolls is not uniform. H1:H1: The die rolls are dependent. The distribution of die rolls is uniform. The die rolls are independent. The distribution of die rolls is not uniform. The degrees of freedom = The test-statistic for this data = (Please show your answer to three decimal places.) The p-value for this sample = (Please show your answer to four…

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8) Suppose you take a 10 question multiple choice test for answers (exactly one is correct). Suppose you guess on e: expected number of correct answers? What is the varianc answers?