Statistics Chapter 5

A therapist goes through her records and finds that 200 of her 400 patients showed significant improvement in mental health over the past year. Hence, the probability of her patients showing significant improvement in mental health is .05 .50 200 400

.50

The standard normal distribution is normally distributed with a mean of ____ and a variance of ____. 0; 1 1; 0 any value; any positive value any positive value; any value

0; 1

A parent decides to reward her child if he eats an average of at least five bites of his vegetables at dinner during the first week. She finds that her child ate 4 + 0.8 (M + SD) bites per meal for the first week. Assuming these data are normally distributed, should this parent reward her child? Yes, because the z score for 5 bites is greater than 0. Yes, because the z score for 5 bites is less than 0. No, because the z score for 5 bites is greater than 0. No, because the z score for 5 bites is less than 0.

No, because the z score for 5 bites is greater than 0.

The ________ converts any normal distribution with any mean and any variance to a standard normal distribution with a mean of 0 and variance of 1. normal distribution standard normal distribution standard normal transformation unit normal table

standard normal transformation

The mean can take on any value and the standard deviation can take on any positive value. Therefore, scores above the mean are distributed the same as scores below the mean extreme scores are possible in a normal distribution there are an infinite number of possible normal distributions this characteristic has no practical implication

there are an infinite number of possible normal distributions