Only 5 and 6 (in photo ) no part c

( Responses. ( = -1.3801. . . Part C: You calculate the standardized test statistic to be ( Responses: 1.645, -1.645, 1.645 ( Responses: sufficient, 1.4142) and the critical value to be f = This gives us ( Responses: do, do not) and - 1. 645, 1.96, -1.96, 1.96 and -1.96) insufficient) evidence to reject the null hypothesis. We have enough evidence that the mean life span of the lightbulbs differ from each other. 5. Which are the conditions that must be satisfied to use a z-test for the difference between population means? Select all that apply. A. The samples must be paired. B. The samples must be independent C. The samples must be randomly selected D. Each population has a normal distribution with a known standard deviation. E. The population must be less than 30. means? 6. What conditions are necessary in order to use a t-test to test the differences between two population A. The population standard deviations are unknown, the samples are randomly selected and independent, and the populations are either normally distributed or at least 30. B. The population standard deviations are unknown, and the populations are either normally distributed or at least 30. C. The population standard deviations are known, the samples are randomly selected and independent, and the populations are either normally distributed or at least 30. D. The population standard deviations are unknown, and the samples are randomly selected and independent