Acar company is testing a new type of tire. they want to determine the average stopping distance in light rain, light snow and dry conditions. they test out tires on four randomly selected cars from the lot. they want to know if the stopping distance is significantly different under the three conditions. what is the factor? -road conditions - stopping distance -four cars

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

How many real-number solutions does the equation have? -4x^2 + 10x + 6 = 0 a. no solutions b. two solutions c. infinitely many solutions d. one solution