You want to estimate the proportion of kids between the ages of 12 and 15 who have tried marijuana. you take a random sample of 130 maryland students and find that 23% of the sample report having tried marijuana. last year, the federal government ran a much larger survey of 10,000 students and found that 29% reported ever using marijuana. test the null hypothesis that the true population proportion of maryland students who have smoked marijuana is 29% versus the alternative hypothesis that it is different than that. use a 3% significance level. interpret your result.

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above