To test the efficacy of a new cholesterol-loweringmedication, 10 people are selected at random. Eachhas their LDL levels measured (shown below asBefore), then take the medicine for 10 weeks, andthen has their LDL levels measured again (After).SubjectBefore After1124114178152188158123135120936167160718918681871829.17113610139120Give a 93.3% confidence interval for HB - Hal thedifference between LDL levels before and after takingthe medication.Confidence Interval =N 34)

Given that Before After 124 114 178 152 188 158 123 135 120 93 167 160 189…

Answered: To test the efficacy of a new…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A sample of freshman takes a reading comprehension test and their scores are summarized below. Sample scores: 16, 8, 8, 6, 9, 11, 13, 9, 10 a. if the mean for the general population on this test is m=12, can you conclude that this sample is significantly different from the population. Test with a=.05 b. Calculate a 90% confidence interval around your mean.
Confidence level=99%, degrees of freedom=19
Having done poorly on a particular exam in a junior high school, 24 students decide to write the exam again to try and improve their mark. Results are given in the following table. ITT Student Attempt 1 (A1) Attempt 2 (A2) Difference (d= A1 - A2) Average Standard deviation 24 55 3.0 24 58 4.4 24 -3.0 2.4 (a) Find an 80% confidence interval for the difference in mean scores between attempt 1 and attempt 2. (Round your answers to 4 decimal places, if needed.) (b) Based on this confidence interval, can we conclude there is a difference in mean scores between attempt 1 and attempt 2? O Yes, since the interval is completely below 0. O No, since the interval contains 0. O Yes, since the interval contains 0. O No, since the interval is completely below 0.
A new postsurgical treatment is being compared with a standard treatment. Seven subjects receive the new treatment while seven others (the controls) receive the standard treatment. The recovery times in days are as follows: Treatment X 12 13 15 19 20 21 27 Control Y 18 23 24 30 32 35 40 calculate a 95% confidence interval for each set of data. Determine the error in the sample mean
A certain test preparation course is designed to help students improve their scores on the LSAT exam. A mock exam is given at the beginning and end of the course to determine the effectiveness of the course. The following measurements are the net change in 33 students' scores on the exam after completing the course: −6,11,18−6,11,18 Using these data, construct a 90%90% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal. Copy Data Step 4 of 4 : Construct the 90%90% confidence interval. Round your answer to one decimal place.
Use the given set of points to construct a 95% confidence interval for β1. No need to interpret the results. x 9 6 5 9 6 12 17 11 y 25 18 15 21 21 28 30 24
To test the efficacy of a new cholesterol-lowering medication, 10 people are selected at random. Each has their LDL levels measured (shown below as Before), then take the medicine for 10 weeks, and then has their LDL levels measured again (After). Subject 1 2 3 4 5 6 Before After 188 202 110 77 184 176 133 97 171 151 131 92 183. 7 8 159 9 168 10 120 Give a 91.6% confidence interval for Ha-HA, the difference between LDL levels before and after taking the medication. Confidence interval= (0.61568,23.3843] 185 170 149 128
At what age do infants speak their first word of English? Here are 20 data of children (age in month) 15 26 10 9 15 20 18 11 8 20 7 9 10 11 11 10 12 17 11 10 whAt is 99% confidence interval for the mean age at which children speak first words? Upper limit? lower limit?

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