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Title: On a multiple choice test with 15 questions, each question has four possible answers, one of which ... Post by: Geometro121 on Mar 3, 2018 On a multiple choice test with 15 questions, each question has four possible answers, one of which is correct. For students who guess at all answers, find the standard deviation for the random variable X, the number of correct answers.
A) 1.62 B) 1.643 C) 1.677 D) 1.587 Q. 2 True or False: The variance of a population is the arithmetic average of the squared deviations about the population mean. A) True B) False Q. 3 Identify the midpoint of the third class. A) 124 B) 125 C) 120 D) 130 Q. 4 Compare a graph of the normal density function with mean of 0 and standard deviation of 1 with a graph of a normal density function with mean equal to 4 and standard deviation of 1. The graphs would A) Have no horizontal displacement but one would be steeper that the other. B) Have the same height but one would be shifter 4 units to the left. C) Have no horizontal displacement but one would be flatter than the other. D) Have the same height but one would be shifted 4 units to the right. Q. 5 A researcher wants to determine what proportion of adults in one town regularly buy organic food. Obtain a sample size that will ensure a margin of error of at most 0.07 for a 90 confidence interval. In previous years, the proportion has been 0. 24. A) 303 B) 7 C) 90 D) 101 Q. 6 Given that 700 people were aged between 25 and 40, approximately how many had a systolic blood pressure reading less than 130? A) 518 B) 168 C) 74 D) 52 Q. 7 The _______________ is the easiest measure of dispersion to calculate. A) Mean absolute deviation B) Variance C) Standard deviation D) Range Title: On a multiple choice test with 15 questions, each question has four possible answers, one of which ... Post by: jfurs03 on Mar 3, 2018 C A B D D A D Title: On a multiple choice test with 15 questions, each question has four possible answers, one of which ... Post by: Geometro121 on Mar 3, 2018 All are answered correctly
Title: On a multiple choice test with 15 questions, each question has four possible answers, one of which ... Post by: jfurs03 on Mar 3, 2018 Happy to help
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