An experimenter wants to determine that the mean number of characters in one text message is more than 125. To prove the claim, the experimenter samples 43 text messages and the sample mean number of characters he/she observed was 131.2. Assume that the population s.d is known to be o = 20. Test at 5% significance level Some parts need Rguroo. Refer to the activity instructions for guidance. a) State the null and alternative hypotheses: The null hypothesis is Ho : [ Select ] VS. Ha : H [ Select ] b) The observed value is [ Select ] c) P-value=P(x > 131.2) = [ Select ] d) Conclusion: Since the p-value is [ Select ] than the significance level a , we can conclude that [ Select ] e) We reject the null for any [ Select ]