stat251 wint06 quiz2 - Quiz#2 Stat 251 5/6 Wilma Name...

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

View Full Document Right Arrow Icon
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Quiz #2 Stat 251 __ 5/6 Wilma Name —|—u—-—‘ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. 1) The amount of corn chips dispensed into a 15—ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 15.5 ounces and a standard deviation of 0.3 ounce. Suppose 100 bags of chips were randomly selected from this dispensing machine. Find the probability that the sample mean weight of these 100 bags exceeded 15.6, ounces. A) .6915 \g M B) .1915 C) .3085 .approximately 0 “7‘65 222:0; ~ 0“ D- 7) “ . r55 57 ’ memo - . .. /e.ae\ 5—)) «r/fi' 005 2) The tread life of a particular brand of tire is a random variable best described by a normal distribution with a mean of 60,000 miles and a standard deviation of 1700 miles. What warranty should the company use if they want 96% of the tires to outlast the warranty? , A) 58,300 miles ‘3, 7,025 miles C) 61,700 miles @975 miles Z: ) 715 V- " l ' moo sea—"lw ‘ I _ 1:»- '3 81405091”; .— 113 2%6 (Demo 2 me; x wopoo "Ll/u. ‘ (01,47 5 = K 3) Suppose that repeated samples were selected from a population and the sample variance was calculated for each. The distribution of these sample variances would be called the A) sampling distribution of ; ‘tandard error @ampling distribution of 52 D) mean of the sampling distribution 4) Find a value of the standard normal random variable 2, called 20, such that P(-—zo s z s 20) = 0.98. @353 B) 0.99 C) 1.96 D) 1.645 V7.04?) ”3H4 2.33 A-l 1) SHORT ANSWER. Solve the problem 9) A new drug has been synthesized that is designed to reduce a person's blood pressure. 9) O I 1% (01+ Nineteen randomly selected hypertensive patients receive the new drug. Suppose the WW a \ probability that a hypertensive patient's blood pressure drops if he or she is untreated is vm 0.8. Then what is the probability of observing~17 or more blood pressure drops in a random sample of 19 treated patients if the new drug is in fact ineffective in reducing blood pressure? to“ Wm?) WM VW (IA—5‘ (0'39”(0 a)” = :0 M ; ' f(l'l)’t FU‘ZDW W51): 0.29361" V 4’\’°“b”"” Pm: ‘1‘}(s‘m‘mw’:brow ‘ l rm —~ ( {2VWVJJ'4M = (LOW-t 0‘00 10) It has been stated that 0.1 of the general population donate their time and energy to 10) \ \ D working on community projects. Suppose 15 people have been randomly sampled from a community and asked if they donated their time and energy to community projects. Let x be the number of them that do donate their time and energy to community projects. Find the probability that more than five of the 1 do donate eir time and energy to community projects. ('9 7 (b,”l,l0( lift} ,‘15 Nil“; 906%) ' ’ ' ' ' {w VS‘G \\ l) O O ...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern