All else constant, which combination of factors would increase the width of a confidence interval most? a smaller sample size and a smaller confidence interval O a larger sample size and a smaller confidence interval O a smaller sample size and a larger confidence interval O a larger sample size and a larger confidence interval If a treatment is expected to decrease scores on a variable for which the mean is expected to be = 50, what is the null hypothesis? Hwith treatment > 50 Hwith treatment < 50 Hwith treatment 50 Owith treatment 50