The experimenter uses a coin to choose either the right hand or the left hand and then asks the therapists to choose the selected hand by placing their hand under her hand without seeing or touching it. As there are two sides to a coin and two hands from which to choose, the probability of choosing the correct hand is or 0.50 or 50%.

We are given that of 324 trials, the therapists were correct 147 times.What would be the best point estimate of the success rate? Please calculate it and explain your choice.

We next calculate the 95% confidence interval. For 95% confidence, zalpha/2 = 1.96 from page 302.

What would be the 95% confidence interval in this case? Is the expected proportion of 0.5 in the confidence interval calculated? Can touch therapists choose the correct hand by sensing energy fields?Please explain.