Matrix a below gives the fraction of the earth's area and the projected fraction of its population for five continents in 2050. matrix b gives the earth's area (in square miles) and its projected 2050 population.† fraction of area fraction of population 0.162 0.047 north america 0.119 0.086 south america a = 0.066 0.065 europe 0.298 0.582 asia 0.202 0.215 africa area population b = 57,850,000 0 area 0 9,322,000,000 population find the area (in square miles) and population of each given continent by finding ab.

The survey of study habits and attitudes (ssha) is a psychological test that measures the motivation, attitude toward school, and study habits of students, scores range from 0 to 200. the mean score for u.s. college students is about 115, and the standard deviation is about 30. a teacher who suspects that older students have better attitudes toward school gives the ssha to 55 students who are at least 30 years of age. the mean score is 113.2. assume the population standard deviation is 30 for older students what is the margin of error for a 95% confidence interval for the population mean score for a. older students? b. compute the 95% confidence interval for the population mean score for older students. c. compute the 99% confidence interval for the population mean score for older students. d. compute the 88% confidence interval for the population mean score for older students.