What type of interaction will change the waves speed the most reflection and refraction diffraction or interference

An insurance company wants to know if the average speed at which men drive cars is higher than that of women drivers. the company took a random sample of 27 cars driven by men on a highway and found the mean speed to be 72 miles per hour with a standard deviation of 2.2 miles per hour. another sample of 18 cars driven by women on the same highway gave a mean speed of 68 miles per hour with a standard deviation of 2.5 miles per hour. assume that the speeds at which all men and all women drive cars on this highway are both approximately normally distributed with unknown and unequal population standard deviations.

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.