MATH 225N Week 6 Statistics Quiz Solutions 2021

MATH 225N Week 6 Quiz Statistics- Question and Answers A statistics professor recently graded final exams for students in her introductory statistics cours e. In a review of her grading, she the mean score out of … 100 points was a x¯=77, with a margin of error of 10……Construct a confidence interval for the mean score (out of 100 points) on the final exam. A random sample of adults were … whether they prefer reading an e-book over a printed book. The survey resulted in a sample proportion of p′=0.14, with a sampling standard deviation of σp′=0.02, who … preferred reading an e-book……Use the empirical rule to construct a 95%confidence interval for the true proportion of adults who prefer e-books. The pages per book in a library are normally … with an unknown population mean. A random sample of books is taken and … results in a 95%confidence interval of (237,293) pages……What is the correct interpretation of the 95% confidence interval? The population standard deviation for the heights of dogs, in inches, in a city is 7 inches. If we want to be 95% … that the sample mean is within 2 inches of the true population mean, what is the minimum sample size that can taken? Round up to the nearest integer. Clarence wants to estimate the percentage of students who live more than three miles from the school. He wants to create a 98%confidence interval which has an error bound of at most 4%. How many students should polled to create the confidence interval? The average score of a … random sample of 87 senior business majors at a university who took a certain standardized test follows a normal distribution with a standard deviation of 28. Use Excel to determine a 90% confidence interval for the mean of the population. Round your answers to two decimal places and use ascending order.. A random sample of 28 statistics tutorials was from the past 5 years and the percentage of students absent from each … one recorded. The results are given below. Assume the percentages of students’ absences are approximately normally distri...

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