Indagine sulla frequenza dei controlli negli autobus: realtà e aspettative dei passeggeri

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(118) Two-sample t test with equal variances -----------------------------------------------------------------------------Group |. Obs. Mean. Std. Err.. Std. Dev.. [95% Conf. Interval]. ---------+-------------------------------------------------------------------0 |. 82. 37.80488. 2.783324. 25.20408. 32.26694. 43.34282. 1 |. 77. 22.48052. 2.681078. 23.52636. 17.14069. 27.82035. ---------+-------------------------------------------------------------------combined |. 159. 30.38365. 2.023325. 25.51316. 26.38739. 34.3799. ---------+-------------------------------------------------------------------diff |. 15.32436. 3.873013. 7.674426. 22.97429. -----------------------------------------------------------------------------diff = mean(0) - mean(1) Ho: diff = 0. t =. 3.9567. degrees of freedom =. 157. Ha: diff < 0. Ha: diff != 0. Ha: diff > 0. Pr(T < t) = 0.9999. Pr(|T| > |t|) = 0.0001. Pr(T > t) = 0.0001. 2XWSXW FRQIURQWRGHOOH PHGLH GHOOH SRSROD]LRQL LWDOLDQDH VWUDQLHUD ULVSHWWR ODSHUFH]LRQHGHLFRQWUROOL ,O WHVW ULILXWD O¶LSRWHVL QXOOD FRQ XQ SYDOXH SDUL D LO FKH FRPSRUWD XQD VLJQLILFDWLYDGLIIHUHQ]DWUDODSHUFH]LRQHGHJOLLWDOLDQLHGHJOLVWUDQLHULDULSURYD GL FLz VL SRVVRQR QRWDUH FRVD GLFKLDUDQR LQ PHGLD L GXH VRWWRFDPSLRQL *OL LQWHUYLVWDWL FKH QRQ VRQR GL QD]LRQDOLWj LWDOLDQD ULWHQJRQR FKH LQ PHGLD OD IUHTXHQ]DGHLFRQWUROOLVLDGHOXQULVXOWDWRQHWWDPHQWHVXSHULRUHULVSHWWR D TXDQWR GLFKLDUDWR GDJOL LWDOLDQL VHFRQGR L TXDOL LQ PHGLD OD IUHTXHQ]D q VROR GHO &LVLqSRLGRPDQGDWRVHO¶DYHUULFHYXWRDOPHQRXQDYROWDODPXOWDSRVVDLQIOXLUH VXOOD SHUFH]LRQH GHL FRQWUROOL ,Q UHDOWj HPHUJH FKH QRQYLq GLIIHUHQ]D FKL KD ULFHYXWRXQDVDQ]LRQHGLFKLDUDLQPHGLDXQDSHUFH]LRQHGHOPHQWUHFKL QRQqPDLVWDWRPXOWDWRTXDVLGHO. 41.

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(123) 6LqSRLULVFRQWUDWDO¶DVVHQ]DGLVLJQLILFDWLYDGLIIHUHQ]DWUDLWDOLDQLHVWUDQLHULQHO GHWHUPLQDUH OD SHUFHQWXDOH GL SHUVRQH FKH YLDJJLDQR VHQ]D WLWROR GL YLDJJLR LQIDWWL VH JOL LWDOLDQL LQ PHGLD VWLPDQR FKH VLDQR LO GHL YLDJJLDWRUL JOL VWUDQLHULGLFRQRLO. Two-sample t test with equal variances -----------------------------------------------------------------------------Group |. Obs. Mean. Std. Err.. Std. Dev.. [95% Conf. Interval]. ---------+-------------------------------------------------------------------0 |. 80. 59.0375. 2.848853. 25.48092. 53.367. 64.708. 1 |. 76. 58.77632. 2.818896. 24.57457. 53.16079. 64.39184. ---------+-------------------------------------------------------------------combined |. 156. 58.91026. 1.998642. 24.96304. 54.96216. 62.85835. ---------+-------------------------------------------------------------------diff |. .2611842. 4.011506. -7.663498. 8.185866. -----------------------------------------------------------------------------diff = mean(0) - mean(1) Ho: diff = 0. t =. 0.0651. degrees of freedom =. 154. Ha: diff < 0. Ha: diff != 0. Ha: diff > 0. Pr(T < t) = 0.5259. Pr(|T| > |t|) = 0.9482. Pr(T > t) = 0.4741. 2XWSXWFRQIURQWRGHOOHPHGLHGHJOLLWDOLDQLHGHJOLVWUDQLHULULVSHWWRODVWLPD SHUFHQWXDOHGHLYLDJJLDWRULLUUHJRODUL ,QDVSHWWDWDPHQWHVLqHYLGHQ]LDWDXQDGLIIHUHQ]DVLJQLILFDWLYDWUDOHPHGLHGHOOH VWLPH GL YLDJJLDWRUL VHQ]D ELJOLHWWR IRUQLWH GDJOL LQWHUYLVWDWL VROL H GD TXHOOL FKH HUDQRLQFRPSDJQLDGLTXDOFXQR'LVHJXLWRqULSRUWDWRLOFDOFRORGHOWHVW Two-sample t test with equal variances -----------------------------------------------------------------------------Group |. Obs. Mean. Std. Err.. Std. Dev.. [95% Conf. Interval]. ---------+-------------------------------------------------------------------0 |. 70. 65.17143. 2.88194. 24.11204. 59.42212. 70.92074. 1 |. 84. 53.08333. 2.655017. 24.33363. 47.80261. 58.36405. ---------+-------------------------------------------------------------------combined |. 154. 58.57792. 2.006288. 24.89738. 54.61432. 62.54153. ---------+-------------------------------------------------------------------diff |. 12.0881. 3.921788. 4.339843. 19.83635. -----------------------------------------------------------------------------diff = mean(0) - mean(1) Ho: diff = 0. t =. 3.0823. degrees of freedom =. 152. Ha: diff < 0. Ha: diff != 0. Ha: diff > 0. Pr(T < t) = 0.9988. Pr(|T| > |t|) = 0.0024. Pr(T > t) = 0.0012. 44.

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