In a study of cell phone usage and brain hemispheric dominance, an internet survey was e-mailed to 6968 subjects randomly selected from an online group involved with ears. there were 1291 surveys returned. use a 0.01 significance level to test the claim that the return rate is less than 20%. use the p-value method and use the normal distribution as an approximation to the binomial distribution. identify the null hypothesis and alternative hypothesis.

How to solve a simultaneous equation involved with fractions?

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.

For what values of x is x2 + 2x = 24 true?