Telephone Company
Telephone Company
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 Kellogg S S Co antique black receiver for candlestick phone wired $52.00 Time Remaining: 44m |
 Vintage Chicago Telephone Supply Co Telephone Generator $100.00 Time Remaining: 12d 19h 15m Buy It Now for only: $100.00 Buy It Now |
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 VINTAGE 1904 ORG WESTERN ELEC CO 349 CANDLE STICK PHONE $151.00 (10 Bids) Time Remaining: 1d 20h 43m |
 Kellogg elec supply co oak hand crank telephone $25.00 Time Remaining: 1d 23h 37m |
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 1904 Farr Telephone Supply Co Chicago Catalog $74.99 Time Remaining: 9d 13h 21m Buy It Now for only: $74.99 Buy It Now |
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 1940s New Jersey Telephone Company Repair Manual Station Apparatus Switching $19.99 (1 Bid) Time Remaining: 2d 4h |
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 ANTIQUE C 1900 NORTHERN ELECTRIC COMPANY Wood TELEPHONE $740.00 Time Remaining: 5d 13h 58m Buy It Now for only: $740.00 Buy It Now |
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 Very Old Phone from Vought Berger Co La Crosse Wis $150.00 Time Remaining: 2d 19h 32m |
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 1891 111 year oldMichigan Bell Telephone Companysigned FRAMEABLE document $0.99 Time Remaining: 2d 19h 35m |
 1891 Pontiac Michigan Telephone Telegraph Construction Companysigned letter $0.99 Time Remaining: 2d 19h 39m |
 1909 OmahaNebraska Telephone CoWAPixleyYostLymanMcFarlandletter $0.99 Time Remaining: 2d 20h 42m |
 VtgCira 1900 Antique KJOBenhavns Telefon AKTIESELSKAB Telephone Co $45.00 Time Remaining: 29d 13h 32m Buy It Now for only: $45.00 Buy It Now |
 1948 Western Electric Company Identification Employee Badge Card Phone Tube Amp $15.00 (1 Bid) Time Remaining: 2d 21h 5m |
 Vintage Antique 1913 American Tel Tel Co 323 Candlestick Rotary Telephone $89.00 (12 Bids) Time Remaining: 2d 21h 46m |
 Bell System Pacific Northwest Bell Company Leather Linemans Technicians Wallet $9.99 Time Remaining: 2d 22h 25m |
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 Vintage TELEPHONE BOOTH WOOD FLIP DOWN SEAT Chicago Hardware Foundry CoPatAppl $47.97 (1 Bid) Time Remaining: 2d 22h 28m |
 Retro Ericofon Telephone 1960s North Electric Co Galion Ohio $10.99 (3 Bids) Time Remaining: 3d 24m |
 1931 Bell Telephone American Telephone And Telegraph Co Annual Report $9.00 Time Remaining: 25d 11h 30m Buy It Now for only: $9.00 Buy It Now |
 1958 Almanac New York Telephone Company Bell Systems Info Facts Ingenuity $2.99 Time Remaining: 3d 3h 1m |
 Vintage MAGNETO for Antique Telephone WESTERN ELECTRIC Co made it Cooool $19.99 (1 Bid) Time Remaining: 3d 15h 20m |
 Vintage LONG Telephone Mouthpiece S H COUCH Co $19.99 Time Remaining: 3d 15h 35m |
 Small wood telephone box 6x5x3 no idea what company $7.50 Time Remaining: 3d 20h 57m Buy It Now for only: $7.50 Buy It Now |
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 Antique Oak Wall Telephone Julius Andrae Sons Co $250.00 Time Remaining: 3d 19h 25m |
 Michigan STATE Telephone Company Photo ID CARD 1930s BELL Badge $143.99 Time Remaining: 18d 4h 31m Buy It Now for only: $143.99 Buy It Now |
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 Brilliant Holographic NEW YORK Telephone A NYNEX COMPANY Calling Card 1988 $4.95 Time Remaining: 3d 21h 34m |
 WESTERN ELECTRIC Co COMPANY FORK SPOON FLATWARE by THOR STAINLESS $19.99 Time Remaining: 3d 21h 56m |
 1901 Marion Alabama Telephone Company Receipt $9.00 Time Remaining: 15d 4h 27m Buy It Now for only: $9.00 Buy It Now |
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 5 Vintage Telephone COMPANY PROPERTY PHONE SWITCH BOARD BAKELITE BELL SYSTEM $14.99 Time Remaining: 3d 23h 12m |
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 Vintage Pacific Bell Pac Telephone Phone Company Mens Work Jacket Coat $15.99 Time Remaining: 3d 23h 25m |
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 Victorian wall phone Leich Electric Co Genoa IL WOW $225.00 Time Remaining: 9d 21h 51m Buy It Now for only: $225.00 Buy It Now |
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 Old New York Telephone Co Private Branch Exchange Switch Board Operation Booklet $9.99 Time Remaining: 4d 18h 7m |
 1950s Western Electric Co Desk Table Top Rotery Dial Telephone Black Bakelite $115.00 Time Remaining: 1d 21h 47m Buy It Now for only: $115.00 Buy It Now |
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 TEST SET FOR WESTERN ELECTRIC STEP SWITCH CO STEPPER SXS $25.00 (1 Bid) Time Remaining: 4d 19h 19m |
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 Automatic Electric Company 1968 Black Space Saver Dispatcher Phone 183 $45.00 Time Remaining: 4d 20h 25m Buy It Now for only: $60.00 Buy It Now |
A telephone company wants to estimate the mean number of minutes people in a city spend talking long distance?
with 95% confidence. From past records, an estimate of the standard deviation is 12 minutes. What is the minimum sample size required if the desired widtch of the confidence interval is 10 minutes
95% confidence interval for the mean is
( sample mean - 1.96*std_dev/sqrt(n), sample mean + 1.96*std_dev/sqrt(n) )
n:sample size
so width of confidence interval is 3.92 * std_dev/sqrt(n),
3.92 * 12/sqrt(n) = 10
sqrt(n)=3.92*12/10=4.704
n=22.1276 --> minimum 23 samples