Li and jen went shopping. • li bought 5 pairs of earrings and 1 necklace for a total of $68. • jen bought 1 pair of earrings and 2 necklaces for a total of $55. each pair of earrings cost e dollars and each necklace cost n dollars. which system of equations can be used to find the cost, in dollars, of each pair of earrings and each necklace? a. 5e + n = $68 e + 2n = $55 b. 5e + n = $68 2e + n = $55 c. e + 5n = $68 e + 2n = $55 d. 5e + 2n = $68       e + n = $55

On a certain portion of an experiment, a statistical test result yielded a p-value of 0.21. what can you conclude? 2(0.21) = 0.42 < 0.5; the test is not statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 21% of the time, so the test is not statistically significant. 0.21 > 0.05; the test is statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 79% of the time, so the test is not statistically significant. p = 1 - 0.21 = 0.79 > 0.05; the test is statistically significant.