Does anyone know how to determine the 95% confidence interval for the difference of the sample means if I only know the standard deviation of the sample mean and the sample mean difference? I'm struggling lol. The standard deviation is 0.69 and the diff of sample means is 1.74 if that helps.

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*