Which of the following is not needed to compute t statistic?

1. a hypothesized value for the population mean
2. the value of the population variance or standard deviation
3. the value of the sample mean
4. the value of the sample variance or standard deviation

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given