1.Choose the answer(s) that is(are) correct.

___Decreasing the confidence level increases the width of a confidence interval.

___Increasing the confidence level increases the width of a confidence interval.

___Decreasing sample size decreases the width of a confidence interval.

___A confidence interval with a 100% confidence level can be computed.

___Increasing sample size decreases the width of a confidence interval.

2...With 80% confidence, for sample proportion 0.56 and sample size 22, what is the upper confidence limit with 2 decimal places?

3.What is the margin of error for the population mean at 90% confidence level for the information in DATA (link)?

A B C Wait Time (minutes) 2.1 8.0 4.6 2.5 3.5 4.3 LD 3.9 10 5.0 11 6.5 12 3.4 13 5.6 14 6.6 15 4.3 16 4.9 17 9.3 18 5.5 19 4.3 20 11.9 21 5.2 22 4.8 23 5.2 24 7.8 25 8.0 26 4.6 27 4.0 28 5.9 29 8.7 30 3.1 31 4.9 32 11.6 33A B C Wait Time (minutes) 1.1 6.8 1.9 0.1 0.4 3.1 1.9 2.0 5.1 1.3 3.6 3.6 2.7 1.9 7.5 3.8 2.3 9.2 3.0 3.3 1.8 4.9 6.0 4.1 1.8 5.7 6.7 2.4 3.3 8.6A C D Time Air Quality 0 :00 00 0:00:30 0 :01 :00 0:01:30 0:02:00 0 :02:30 0:03:00 0:03:30 0:04:00 12 0:04:30 13 0:05 :00 14 0:05:30 0 :06 :00 0 :06:30 17 0:07:00 0 :07:30 19 0:08:00 20 0:08:30 0:09 :00 0:09:30 0:10 :00 0:10:30 0:11:00 0:11:30 0:12 :00 0:12:30 29 0:13:00 0:13:30 0:14:00 0:14:30 0:15:00 0:15:30 0:16 00 0:16:30 0:17:00 0:17:30 19 0:18:00 0:18:30 0:19:00 0:19:30 0:20 :00 0:20:30 0:21 :00 0:21:30 0:22 :00 0:22:30 19 0:23:00 0:23:30\fCustomer Traffic With Program Without Program 136 140 228 233 111 110 38 42 332 332 132 135 150 151 35 33 189 178 141 147 175 162 253 243 144 149 49 48 356 346Valley Foothills 109 82 116 161 106 163 157 112 147 222 105 137 173 226 153 200 137 154 110 176Ovservation Portland Houston Jacksonville 85 71 61 75 75 66 82 73 64 76 74 71 71 69 77 85 82 69