You may need to use the appropriate technology to answer this question.In order to determine whether or not a driver's education course improves the scores on a driving exam, a sample of 6 drivers were given the exam before and after taking the course. The results are shown below. Assume the population of differences is normally distributed.Driver123456Score Beforethe Course849194768679Score Afterthe Course878891779383Let d = Score After Score Before.(a) Compute the test statistic. (Round your answer to three decimal places.)(b) Using a = 0.05 and the p-value approach, test to see if taking the course actually increased scores on the driving exam.Calculate the p-value. (Round your answer to four decimal places.)p-value=What is your conclusion?O We do not reject H. There is no significant difference.O We do not reject Ho. There is a significant difference.O We reject Ho. There is no significant difference.O We reject Ho. There is a significant difference.

The number of paired sample observation is The sample data on drivers scores before and after taking…

Answered: In order to determine whether or not a…

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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The data below show a sample of grades of students on their final exam in a statistics class. Grades 81 84 83 69 80 70 74 67 71 64 63 68 79 a) Find the average final exam grades for this class. [Round your answer to two decimal places.]The mean of midterm exam for the class was 83.31. Did the students tend to perform better on their final exam or midterm exam? Select an answer Final Exam Midterm Exam b) Find the sample standard deviation of the final exam grades. [Round your answer to two decimal places.]The standard deviation of the midterm grades was 5.31. Did the student's final grades tend to have more or less variation than their midterm grades? Select an answer more variation less variation
Blood pressure: A blood pressure measurement consists of two numbers: the systolic pressure, which is the maximum pressure taken when the heart is contracting, and the diastolic pressure, which is the minimum pressure taken at the beginning of the heartbeat. Blood pressures were measured, in millimeters, for a sample of 8 adults. The following table presents the results. Systolic Diastolic 125 85 108 85 103 78 114 78 119 67 118 88 131 75 116 71 Send data to Excel The least-squares regression line y = b,+b,x= 89.6478 – 0.0966x and E (x-x) = 551.5000 are known for this data. Use the critical value method to test H,: B, = 0 versus H, : B, <0. Can you conclude that systolic blood pressure is useful in predicting diastolic blood pressure? Use the a = 0.05 level of significance. Part: 0/ 4 Part 1 of 4 Find the critical value(s). Round the answer to three decimal places. If there is more than one critical value, separate them with commas. Critical value(s):
The calorie counts for the 17 poultry brands are 129 112 102 106 94 101 97 99 141 113 115 132 86 133 302 146 134 a. Find the mean of the data set. b. Find the Five-number summary of the data set. c. From part (a) and (b), describe the overall distribution of the data set for a non-statistician employer. For example, do you see any kind of skewness in the data set? Is there any outlier? Why?
Blood pressure: A blood pressure measurement consists of two numbers: the systolic pressure, which is the maximum pressure taken when the heart is contracting, and the diastolic pressure, which is the minimum pressure taken at the beginning of the heartbeat. Blood pressures were measured, in millimeters, for a sample of 8 adults. The following table presents the results. Systolic Diastolic 125 85 108 85 103 78 114 78 119 67 118 88 131 75 116 71 Send data to Excel = 551.5000 are known for this data. Use the The least-squares regression line y = b,+b,x 89.6478 – 0.0966x and E (x-x) P-value method to test H:B, =0 versus H, : B, <0. Can you conclude that systolic blood pressure is useful in predicting diastolic blood pressure? Use the a = 0.10 level of significance and the TI-84 calculator.
Waiting times (in minutes) of customers at a bank where all customers enter a single waiting line and a bank where customers wait in individual lines at three different teller windows are listed below. Find the coefficient of variation for each of the two sets of data, then compare the variation. Bank A (single line): 6.4 6.7 6.7 6.8 7.1 7.3 7.3 7.6 7.7 7.7 o 4.3 5.3 5.9 6.3 6.7 7.6 7.8 8.5 9.3 9.8 Bank B (individual lines): The coefficient of variation for the waiting times at Bank A is %. (Round to one decimal place as needed.) The coefficient of variation for the waiting times at the Bank B is %. (Round to one decimal place as needed.) Is there a difference in variation between the two data sets? O A. There is no significant difference in the variations. O B. The waiting times at Bank B have considerably less variation than the waiting times at Bank A. O C. The waiting times at Bank A have considerably less variation than the waiting times at Bank B. Ans
fill in blank, there are only 3 options, decreases, increases or remain the same.
K Students in an experimental psychology class did research on depression as a sign of stress. A test was administered to a sample of 30 students. The scores are shown below. 43 51 11 90 77 36 64 37 42 72 54 62 36 75 51 72 37 28 38 61 47 63 36 41 22 37 51 46 85 13 To find the 10% trimmed mean of a data set, order the data, delete the lowest 10% of the entries and the highest 10% of the entries, and find the mean of the remaining entries. Complete parts (a) through (c). (a) Find the 10% trimmed mean for the data. The 10% trimmed mean is (Round to the nearest tenth as needed.)
A student must have a B average or better for all courses to qualify for any athletic team at Jefferson High School. The table below shows the distribution of students' grades in three sports at the school. Students with Students with a Sport an A Average B Average Field hockey 15 4 Basketball 7 13 Football 2 22
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Students in an experimental psychology class did research on depression as a sign of stress. A test was administered to a sample of 30 students.The scores are shown below. 43 51 11 91 77 36 64 37 42 72 54 62 36 75 51 D 72 37 29 39 61 48 63 36 41 21 37 51 47 86 14 To find the 10% trimmed mean of a data set, order the data, delete the lowest 10% of the entries and the highest 10% of the entries, and find the mean of the remaining entries. Complete parts (a) through (c). (a) Find the 10% trimmed mean for the data. The 10% trimmed mean is (Round to the nearest tenth as needed.) (b) Compare the four measures of central tendency, including the midrange. Mean = (Round to the nearest tenth as needed.) Median = Mode = (Use a comma to separate answers as needed.) The midrange is found by the following formula. (Maximum data entry) + (Minimum data entry) Midrange = (Round to the nearest tenth as needed.) (c) What is the benefit of using a trimmed mean versus using a mean found using all data…
The following data lists the ages of a random selection of actresses when they won an award in the category of Best Actress, along with the ages of actors when they won in the category of Best Actor. The ages are matched according to the year that the awards were presented. Complete parts (a) and (b) below. Actress (years) 27 Actor (years) 61 29 35 28 31 36 39 36 33 25 27 34 47 41 41 31 37 35 D 43 a. Use the sample data with a 0.01 significance level to test the claim that for the population of ages of Best Actresses and Best Actors, the differences have a mean less than 0 (indicating that the Best Actresses are generally younger than Best Actors). In this example, H is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the actress's age minus the actor's age. What are the null and alternative hypotheses for the hypothesis test? Ho Hd= 0 year(s) H₁ Hd< 0 year(s) (Type integers or decimals. Do not round.)…
The following data lists the ages of a random selection of actresses when they won an award in the category of Best Actress, along with the ages of actors when they won in the category of Best Actor. The ages are matched according to the year that the awards were presented. Complete parts (a) and (b) below. Actress (years) 26 Actor (years) 26 32 28 38 29 29 45 27 31 D 60 37 40 40 28 36 50 35 41 43 a. Use the sample data with a 0.01 significance level to test the claim that for the population of ages of Best Actresses and Best Actors, the differences have a mean less than 0 (indicating that the Best Actresses are generally younger than Best Actors). In this example, Hd is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the actress's age minus the actor's age. What are the null and alternative hypotheses for the hypothesis test? Ho: Ha year(s) year(s) (Type integers or decimals. Do not round.)

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