Q4. To see how much of a difference time of day made on the speed at...

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Q4. To see how much of a difference time of day made on the speed at which he could download files, a second-year university student performed an experiment. He placed a file on a remote sever and then proceeded to download it at three different time periods of the day. He downloaded the file 48 times in all, 16 times at each time a day, and recorded the time in seconds that the download took. Early (7 a.m.) Evening (5 p.m.) Late night (12 a.m.) Time (sec) Time (sec) Time (sec) 68 299 216 138 367 175 75 331 274 186 257 171 68 260 187 217 269 213 93 252 221 90 200 139 71 296 226 154 204 128 166 190 236 130 240 128 72 350 217 81 256 196 76 282 201 129 320 161 2 (a) State the null and alternative hypotheses, being careful to talk about download time and time of day as well as parameters. (b) Perform an ANOVA on these data. What can you conclude? (c) Check the assumptions and conclusions for an ANOVA. Do you have any concerns about the experimental design or the analysis? Q4. To see how much of a difference time of day made on the speed at which he could download files, a second-year university student performed an experiment. He placed a file on a remote sever and then proceeded to download it at three different time periods of the day. He downloaded the file 48 times in all, 16 times at each time a day, and recorded the time in seconds that the download took. Early (7 a.m.) Evening (5 p.m.) Late night (12 a.m.) Time (sec) Time (sec) Time (sec) 68 299 216 138 367 175 75 331 274 186 257 171 68 260 187 217 269 213 93 252 221 90 200 139 71 296 226 154 204 128 166 190 236 130 240 128 72 350 217 81 256 196 76 282 201 129 320 161 2 (a) State the null and alternative hypotheses, being careful to talk about download time and time of day as well as parameters. (b) Perform an ANOVA on these data. What can you conclude? (c) Check the assumptions and conclusions for an ANOVA. Do you have any concerns about the experimental design or the analysis?