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**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
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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
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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
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'(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
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& 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% ...

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