stat251 wint06 quiz1

# stat251 wint06 quiz1 - Quiz 1 Stat 251 ‘ ‘Zz 01:6...

• Homework Help
• PresidentHackerCaribou10582
• 2

This preview shows pages 1–2. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Quiz 1 Stat 251. ‘ . ‘Zz( 01:6 , woe </€’O ’ L‘ SHORT ANSWER. Name Solve the problem. 1) Various state and national automobile associations regularly survey gasoline stations to determine the current retail price of gasoline. Suppose one such national association decides to survey 200 stations in the United States and intends to determine the price of regular unleaded gasoline at each station. In the context of this problem, define the following descriptive measures with one sentence for each: u, o, x<s “Slim? i 6 me samptt (NP ﬁne zoo stanont SIN W“ \\(\ SUV \IQWN .' p ‘ . Tby: Atom will be -t\nc average gait unrest from mt WON. 2) The ages of professors in the biology department at a private university are 48, 46, 64, 40, 2) O , I . and 4%alculate the sample variance of these ages. Show all work. ((1.0 —4‘4 9).? _' L . 2 (0 1% ' ib’r‘iw-(o‘t T10...“ —. 44 .471 @(r‘t’l .492 - 0125b 7 S ”ﬁrs—d (4’! ~44 .92 2 ' .‘i l _ 0cm? audio-14.49,, 0.0‘ﬂ7 L :1 ) '3'“ 33 4'1 0.0411to,7’5g0+2_,‘2,\$’+2.2‘o*O.O\bg"ll/ip/l MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. V 3) A data set contains the observations 2, 7, 3, 8, 1. Find Ex 2 - Z: 2. 3) A LL); ,4 2 (LHMMmI-m) —— (11119”in C1); ‘ 44 v \21 - QﬁD S @3129, 01-31%. =%8’-%/ '(D 1 " \ (1198.8 B) 101.6 C) 352.8 D) 215.2 SHORT ANSWER. 4) A study was designed to investigate the effects of two variables — (1) a student's level of 4) D .5 QWVQ mathematical anxiety and (2) teaching method — on a student's achievement in a ‘ihe 2(COEC mathematics course. Students who had a low level of mathematical anxiety were taught ‘5 ’ using the traditional expository method. These students obt ' a mean score of 490 and a standard deviation of 20 on a standardized test. Find a d interpret he z-score of a student who scored 500 on the standardized test. 0 . / l S o O — O _ e z scoP—e. \ f ’4 ﬂ'élzfﬁ‘hcﬁ Z Z S fl‘lﬂJéx/C/ [/{Vicadéf‘ﬂ W'G & b CW/C’ M 9) A manufacturer of cellular phones has decided that an assembly line is operating satisfactorily if 9) less than 3% of the phones produced per day are defective. To check the quality of a day's production, the company decides to randomly sample 50 phones from a day's production to test for D defects. Define the population of interest to the manufacturer. -—1°r)-t-he 50 phones sampled and tested .ie 3% of the phones that are defective NQethe 50 responses: defective or not defective D) all the phones produced during the day in question 10) A study was designed to investigate the effects of two variables - (1) a student's level of 10) mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional % expository method. These students obtained a mean score of 440 with a standard deviation of 20 on i a standardized test. Assuming a mound—shaped and symmetric distribution, what percentage of scores exceeded 400? " A) approximately 100% i B) approximately 97.5% C) approximately 84% D) pproximately 95% ...
View Full Document

• Fall '06
• staff

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern