Written Assignment #1: To submit your assignment, click on the Written Assignment #1 link above. This will take you to a Preview Upload Assignment window. You'll need to scroll down to Assignment Submission. From here you can write a text submission or select Browse My Computer and find your file. Directions: Answer each of the following questions. Show your work or explain how you arrived at your conclusion whenever appropriate. Use your calculator. In a random sample of 175 community college students, the mean number of hours spent studying per week is 13.7 hours and the standard deviation is 4 hours. a) Find the standard score (z-score) for students who study the following hours in a particular week. Round Z to the nearest hundredth and interpret the meaning of each answer as it pertains to this problem. ()22 hours ii) 6 hours b)Assuming the distribution of the number of hours community college students study per week is normally distributed, approximately how many of the students in the sample study between 9.7 and 17.7 hours per week? c) Assuming the distribution of the number of hours community college students study per week is normally distributed, approximately how many of the students in the sample study less than 5.7 hours per week? d) Without assuming anything about the distribution of the number of hours community college students study per week, at least what percentage (approximately) of the students study between 7.3 and 20.1 hours per week? e) Without assuming anything about the distribution of the number of hours community college students study per week, at most what percentage of the students study less than 1.7 hours or more than 25.7 hours per week?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Written Assignment #1: To submit your assignment, click on the Written Assignment #1 link above. This will take you to
a Preview Upload Assignment window. You'll need to scroll down to Assignment Submission. From here you can write a text
submission or select Browse My Computer and find your file.
Directions: Answer each of the following questions. Show your work or explain how you arrived at your conclusion whenever
appropriate. Use your calculator.
In a random sample of 175 community college students, the mean number of hours spent studying per week is 13.7 hours and
the standard deviation is 4 hours.
a) Find the standard score (z-score) for students who study the following hours in a particular week. Round Z to the nearest
hundredth and interpret the meaning of each answer as it pertains to this problem.
i) 22 hours
ii) 6 hours
b)Assuming the distribution of the number of hours community college students study per week is normally distributed,
approximately how many of the students in the sample study between 9.7 and 17.7 hours per week?
c) Assuming the distribution of the number of hours community college students study per week is normally distributed,
approximately how many of the students in the sample study less than 5.7 hours per week?
d) Without assuming anything about the distribution of the number of hours community college students study per week, at
least what percentage (approximately) of the students study between 7.3 and 20.1 hours per week?
e) Without assuming anything about the distribution of the number of hours community college students study per week, at
most what percentage of the students study less than 1.7 hours or more than 25.7 hours per week?
Transcribed Image Text:Written Assignment #1: To submit your assignment, click on the Written Assignment #1 link above. This will take you to a Preview Upload Assignment window. You'll need to scroll down to Assignment Submission. From here you can write a text submission or select Browse My Computer and find your file. Directions: Answer each of the following questions. Show your work or explain how you arrived at your conclusion whenever appropriate. Use your calculator. In a random sample of 175 community college students, the mean number of hours spent studying per week is 13.7 hours and the standard deviation is 4 hours. a) Find the standard score (z-score) for students who study the following hours in a particular week. Round Z to the nearest hundredth and interpret the meaning of each answer as it pertains to this problem. i) 22 hours ii) 6 hours b)Assuming the distribution of the number of hours community college students study per week is normally distributed, approximately how many of the students in the sample study between 9.7 and 17.7 hours per week? c) Assuming the distribution of the number of hours community college students study per week is normally distributed, approximately how many of the students in the sample study less than 5.7 hours per week? d) Without assuming anything about the distribution of the number of hours community college students study per week, at least what percentage (approximately) of the students study between 7.3 and 20.1 hours per week? e) Without assuming anything about the distribution of the number of hours community college students study per week, at most what percentage of the students study less than 1.7 hours or more than 25.7 hours per week?
Expert Solution
Step 1

Que.
No: -130
Ans: - Let XHous spent studying
pet weekk
XNN ( 13.764), m 175
22-13.7
4
a scote
2.075
it Z 2-1 6-13.7--1.325
T

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