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Children in grade six take two exams each: one on math and one on vocabulary. For each exam, larger scores are better. One child, Donald, scores 55 on the math test and 75 on the vocabulary test. Betty says, “Donald’s two scores are equally good because each score is 5 points above its exam’s mean.
18.05 Introduction to Probability and Statistics (S22), Exam 1 Review: all questions: solutions
Question Bank for Statistics Part – 1 Chapter # 1: Introduction to Statistics 1. Define statistics. Ans: It is a branch of science that deals in collection, processing, presentation, analysis and interpretation of numerical data in order to make decision. 2. Define population and sample. Ans: Population:
Short Questions (each carry 2 Marks) 1. Define statistics. 2. Define primary and secondary data 3. Give the advantages of tabulation 4. Write a detail note on the types of classification 5. What are the essential characteristics of a good table? 6. What is the purpose of data presentation? 7. Explain the concept of a sample. 8.
Question 1 (**) The number of phone text messages send by 11 different students is given below. 14, 25, 31, 36, 37, 41, 51, 52, 55, 79, 112. a) Find the lower quartile, the median and the upper quartile of the data. b) Show clearly that there is only one outlier in the data.
Problem 1. In a ballroom dancing class the students are divided into group and group . There are six people in group and seven in group . If four s and four s are chosen and paired of, how many pairings are possible? Solution: Build the pairings in stages and count the ways to build each stage: 6. Stage 1: Choose the 4 from group : ( ). 4. 7.
1. (20) A reasonably random sample of 104 Duke students were asked how many hours, on average, they spend online networking per week and online reading the news per week. The sample means were 9.0 hours and 3.2 hours, respectively.
Model Question Paper-2 Probability and Statistics Answer All the questions [70 marks] 1 a) If the p.d.f of a r.v xis given by = ๐(1 − 2), 0 < < 1 0, ๐ โ ๐ find i) k and ii) the cumulative distribution function of x
NOTE: Regardless of your answers to part [i], complete all remaining parts. ii) (3 points) Using the information in the introduction of this question, create a 93% confidence interval for the proportion of all UT sophomores who regularly recycle.
Practice Exam Questions and Solutions for Midterm 1 Statistics 301, Professor Wardrop. Sarah performs a CRD with a dichotomous re-sponse. She obtains the sampling distribution of the test statistic for Fisher’s test for her data; it is given below. P (X = x)