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Out of all the students that attend Yale University, 1,982 were selected to participate in a school survey about their commute to school. 70% said that their commute to school was fine, while the others were dissatisfied with their commute. Calculate a 90% confidence interval for the proportion of students at Yale who feel their commute to school is fine the way it is.
CI = (67. 35%, 72. 65%)
CI = (67. 98%, 72. 02%)
CI = (68. 76%, 71. 98%)
CI = (68. 31%, 71. 69%)
Let's say you took a sample of 445 voice-activated smart TVs. The mean rate at which these TVs need to be serviced or replaced is every 3. 5 years, with a standard deviation of 0. 8 years. Given a confidence level of 95%, what is the maximum error of estimate?
7. 43%
32. 52%
12. 54%
0. 35%
There are 2,367 teachers in a certain school district. 600 were polled asking if they felt computers in the classroom were beneficial to. 85% of the teachers polled felt that computers in the classroom were beneficial to students. What is the confidence interval for the population mean of teachers in this district that feel computers in the classroom are beneficial to students, using a 99% confidence level?
CI = (82. 14%, 87. 86%)
CI = (82. 60%, 87. 40%)
CI = (81. 98%, 88. 21%)
CI = (81. 25%, 88. 75%)
Out of 1,500 licensed drivers, 900 admitted that they do not like to drive at night. What is the 92% confidence interval for the population mean of drivers that do not like driving at night?
CI = (56. 90%, 61. 76%)
CI = (56. 74%, 63. 26%)
CI = (57. 79%, 62. 21%)
CI = (57. 21%, 62. 87%)
