A professor in the psychology department would like to determine whether therehas been a significant change in grading practices over the years. It is known thatthe overall grade distribution for the department in 1985 had 14% As, 26% Bs,31% Cs, 19% Ds, and 10% Fs. A sample of n=200psychology students from lastsemester produced the following grade distribution:C DF64 61 12A B32 61Do the data indicate a significant change in the grade distribution? Test at the .05level of significance.

Answered: Image /qna-images/answer/6683fc01-39c8-4dba-84b4-5c4af2e96ebc.jpg

Answered: A professor in the psychology…

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 midterm and final exam grades for a statistics course are provided in the data set below. Jaymes, a student in the class, scored 86 on both exams. Treat the given data sets as samples. Midterm: 80, 78, 85, 82, 79, 79, 78, 86, 80, 84, 78, 84, 80, 84, 81, 78, 81, 82, 78, 84 Final: 81, 88, 68, 69, 69 81, 82, 86, 76, 71, 72, 68, 77, 86, 68, 83, 84, 71, 81, 87 z-score for midterm: 1.857 z-score for final: 1.181 Based on the z-scores calculated above, which of Jaymes's grades is more unusual, the midterm grade or the final exam grade? Select the correct answer below: A. The absolute value of the z-score for the final exam grade is greater than for the midterm grade, so the final exam grade is more unusual. B. The absolute value of the z-score for the midterm exam grade is less than for the final grade, so the midterm grade is more unusual. C. The absolute value of the z-score for the midterm exam grade is greater than for the final grade, so the midterm grade is more…
The following are 30 UAS scores for the UT Statistics Student PPD Course. 75 89 47 80 65 59 60 75 84 61 63 78 92 85 79 56 64 90 Present the data in graphical form as follows. a. Make a Boxplot diagram b. Make a Histogram 55 79 55 78 64 68 90 50 70 59 56 84
Car manufacturers produced a variety of classic cars that continue to increase in value. Suppose the following data is based upon the Martin Rating System for Collectible Cars, and shows the rarity rating (1-20) and the high price ($1,000) for 15 classic cars. Model Rating Price ($1,000) A 18 1,600.0 B 17 450.0 19 3,975.0 15 77.5 18 350.0 17 140.0 16 125.0 16 250.0 14 87.0 19 1,300.0 16 375.0 19 2,650.0 13 45.0 17 375.0 18 1,000.0 00 с D E LL F G H I J L M N O
What is one indication that there are paired samples in a data set? Choose the correct answer below. O A. Knowing the value that a subject has in one group gives one no information about the value in the second group. OB. Each observation in one group is coupled with one particular observation in the other group. OC. The researcher is comparing two populations. O D. The researcher is working with two distinct groups in the data set.
The following data said shows the bank account balance for a random sample of 17 IRSC students. Round solution to two decimal places if necessary. What is the mean of this data set? Mean= What is the median of this data set? Median= What is the mode of this data set if no modes exist type DNE. if multiple modes exist enter the values in a comma separated lists Mode=
Suppose we have the following data available for the average number of hours spent in the Santa Fe College Math lab. Male Female 1.50 0.75 1.20 0.82 1.30 0.91 1.05 0.84 0.75 0.59 0.80 1.02 1.00 1.90 0.95 2.10 0.925 2.20 2.50 2.50 3.00 3.50 3.50 2.20 4.01 1.80 Use Data Displays to comment on the shape of the distribution, measures of center and spread, possible skew, and outliers for both genders. (Hint: Use as many displays as needed.)
A. For which data set is the sample correlation coefficient r closest to −1? B. For which data set is the sample correlation coefficient r closest to 0? C. For which data set is the sample correlation coefficient r equal to 1?

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