In: Statistics and Probability
Credit Card Purchase Amounts ($) |
887.95 |
359.87 |
1186.26 |
319.77 |
1075.23 |
1097.77 |
430.93 |
91.51 |
419.39 |
209.65 |
17.69 |
14.55 |
707.58 |
311.09 |
42.53 |
682.24 |
45.61 |
1153.03 |
427.54 |
60.14 |
1163.06 |
59.74 |
1086.84 |
156.89 |
37.09 |
125.36 |
420.76 |
167.65 |
58.33 |
147.75 |
50.97 |
356.96 |
480.08 |
10.49 |
55.55 |
385.94 |
1145.87 |
94.15 |
9.89 |
91.55 |
44.65 |
664.52 |
27.46 |
900.03 |
46.95 |
57.42 |
852.98 |
389.79 |
551.74 |
69.23 |
896.29 |
1181.19 |
484.76 |
28.46 |
16.46 |
67.37 |
1124.64 |
896.59 |
454.13 |
89.29 |
15.94 |
1089.87 |
131.74 |
39.93 |
591.93 |
447.48 |
36.18 |
352.06 |
660.99 |
20.78 |
33.92 |
1006.53 |
235.82 |
44.37 |
10.14 |
734.09 |
488.57 |
11.21 |
320.57 |
39.59 |
91.21 |
964.54 |
241.26 |
94.83 |
865.56 |
758.44 |
469.68 |
179.64 |
1092.28 |
395.07 |
62.15 |
1021.83 |
121.67 |
69.34 |
626.32 |
78.35 |
22.69 |
169.85 |
77.15 |
1187.23 |
The data set in the accompanying table contains last month's credit card purchases of
100
customers randomly chosen from a segment of a major credit card issuer. The marketing department is considering a special offer for customers who spend more than
$1000
per month on their card. From these data construct a
90%
confidence interval for the proportion of customers in this segment who will qualify.
The 90% confidence interval is: