A group of scientists want to set up an experiment to have a power of 0.90 to detect mu_A=23. Their hypotheses are H_0: mu ≤ 20, H_A: mu > 20. They plan to do the test at alpha=0.05 and using the population assumptions of X-bar is approximately normal and sigma = 2. What sample size should be used?

Which of the following is true about the graph of f(x)=7^x. select all that apply. a= it intercepts the x axis b=it intercepts both axis c=it intercepts neither d=it intercepts the y axis

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.

Find the value of the variable and the length of each chord for #5 and #6.