quiz%206C - Stat 119 Qniz 6C Name: Red id: Use the...

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

View Full Document Right Arrow Icon
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Stat 119 Qniz 6C Name: Red id: Use the following to answer Questions 1-3: A 90% confidence interval for the proportion of drivers who change CD5 while they are driving is {0.633. 0.667) 1. (2 points) What is the point estimate of the true proportion of drivers who change CD5 while driving? (i point) The margin of error for the confidence interval is: .saa retire $0 is m3” Answer 3. (i point) What is the best interpretation of the above intervai? A. 90% of the time the sampie proportion of drivers who change CDs while driving wili be within the intervai. B. 90% of the time the true proportion of drivers who change CD5 while driving will be within the interval. C. We are 90% confident that the sample proportion of drivers who change CD5 ._ whiie driving will be within the intervai. We are 90% confident that the tree proportion of drivers who change CDs while ' driving wiii be within the interval. Use the following information for problems 4-7 “a A survey conducted at SDSU interviews a random sample of 267 female students and 190 P :2 __ admitted to dieting within the past 12 months. " 4. (3 points) Construct a 99% confidence intervai for p, the population proportion of female SDSU students who have been on rant i: Meet ens a. car 6 NW; 333$) 5. (1 point) Give a onewsentence interpretation of yo r confidence intervai. an M; W gig g W? rite. earth sg fame anger gm _ a3 mm mvg .. a éégvg 2‘ es risen. are, a, éi: fir?“ wig 6. {2 points) How many female students wonid we need to survey in order to reduce the margin of error to 0.03? m 5 mi :3 is”; a» is. 7. (1 point} Suppose the researcher decided that he wanted to obtain a shorter confidence intervai than the one caiculated above. This couid be accomplished by: A Using a lower level of confidencee’ Using a smaller sampie size. X B. C. Using a higher levei of confidence. sf D. Both A) and B) % Answer: Use the foliowing information for problems 8-9 An article in the Annals offite Association of American Geographers revealed that only E13 of 337 randomly seiected residences in Les Angeies County were protected by earthquake insurance. Do the data provide sufficient evidence to show that less than 40% of the residents of Los Angeles County are protected by earthquake insuraaee‘? Use a 0.05 Eevel of significance. 8. (1 point) Give two assumptions that must be met in order for a hypothesis t to be valid yet? We eegeito “ gag sagaeete at Q. mt at? eeeetaase a. 9. Conduct a hypothesis test: I. (2 points) State the nut} and alternative hypotheses. II. (2 points) Caicuiate the test statistic. is: ‘Eggg “" 'ié-g E .... x u 3;: ‘ gfiegg " .. 5 2 {is 2“ HI. (2 points) Caiculate the corresponding p-Value. 3" Vales e; We eel, tats 3 .eeeg ...
View Full Document

This note was uploaded on 05/04/2008 for the course STAT 119 taught by Professor Helen during the Spring '07 term at San Diego State.

Page1 / 2

quiz%206C - Stat 119 Qniz 6C Name: Red id: Use the...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online