3. A high school math teacher claims that students in her class will score higher on math portion of the NAT than students in a colleague’s math class. The mean NAT Math score for 49 student in her class is 22.1 and the standard deviation is 4.8. On the other hand, the man NAT Math score for 44 of the Colleague’s students in 19.8 and the standard deviation is 5.4. At alpha = 0.10, is there enough evidence to support the claim of the teacher that her students will score better on math portion of the NAT than students in her colleague’s math class? 4. The amount of a certain trace element in blood is known to vary with a standard deviation of 14.1 ppm (parts per million) for male blood donors and 9.5 ppm for female donors. Random sample of 75 male and 50 female donors yield concentration means of 28 and 33 ppm, respectively. Is it correct to conclude that the population means of concentrations of the element significantly differ for male and female donors. Test at alpha = 0.01.
3. A high school math teacher claims that students in her class will score higher on math portion of the NAT than students in a colleague’s math class. The mean NAT Math score for 49 student in her class is 22.1 and the standard deviation is 4.8. On the other hand, the man NAT Math score for 44 of the Colleague’s students in 19.8 and the standard deviation is 5.4. At alpha = 0.10, is there enough evidence to support the claim of the teacher that her students will score better on math portion of the NAT than students in her colleague’s math class?
4. The amount of a certain trace element in blood is known to vary with a standard deviation of 14.1 ppm (parts per million) for male blood donors and 9.5 ppm for female donors. Random sample of 75 male and 50 female donors yield concentration means of 28 and 33 ppm, respectively. Is it correct to conclude that the population means of concentrations of the element significantly differ for male and female donors. Test at alpha = 0.01.
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