1.A test score of 48.4 on a test having a mean of 66 and a standard deviation of 11. Find the z-score corresponding to the given value and use the z-score to determine whether the value is significant. Consider a score to be significant if its z-score is less than −2.00 or greater than 2.00.
2.A certain group of test subjects had pulse rates with a mean of 70.2 beats per minute and a standard deviation of 11.4 beats per minute. Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high. Is a pulse rate of 123.0 beats per minute significantly low or significantly high?