Your score of 90 on a calculus class gave you a z-score of +2.00. If the class Mean was 80.00, what was the Standard Deviation?
Your score of 90 on a calculus class gave you a z-score of +2.00. If the...
This discussion introduces you to normal probability via the calculated z-score. A z-score converts a non-standard normal distribution into a standard normal distribution; a standard normal distribution has a mean of zero and standard deviation of one. This discussion introduces you to normal probability via the calculated z-score. A z-score converts a non- standard normal distribution into a standard normal distribution; a standard normal distribution has a mean of zero and standard deviation of one. Additional z-score properties and details...
One college class had a total of 90 students. The average score for the class on the last exam was 86.3 with a standard deviation of 4.4. A random sample of 39 students was selected. a. Calculate the standard error of the mean. b. What is the probability that the sample mean will be less than 88? c. What is the probability that the sample mean will be more than 87? d. What is the probability that the sample mean...
What z-score corresponds to a score that is 2 standard deviation units ABOVE the mean? (PLEASE SHOW WORK) A). z= +1.50 B). z= -1.50 C). z= -2.00 D). z= +2.00
Using a computer or calculator that provides proportions falling below a specified z-score, determine the approximate proportion for each of the following situations. In each case, assume the values are approximately bell-shaped. (Round your proportions to four decimal places.) (a) The proportion of SAT scores falling below 430 for a group with a mean of 500 and a standard deviation of 100. ______ (z-score) ______ (approximate proportion) (b) The proportion of boys with heights below 36.4 inches for a group with...
Suppose your statistics professor reports test grades as z-scores, and you got a score of 1.79 on an exam. a) Write a sentence explaining what that means b) Your friend got a z-score of-1. If the grades satisty the Nearty Normal Condition, about what percent of the class scored lower than your fiend? a) Choose the corredt answer belaw O A. The score was 1.79 points lower than the mean score in the ciass O B. The score was 1.79...
7. z-scores and standardized scores Is a standardized score necessarily a z-score? Yes No Consider the following distribution of scores with a mean of 90 and a standard deviation of 30. For the letters A, B, C, and D in the boxes beneath the line labeled "z" give the z-scores corresponding to each position in the distribution. One z-score is already filled in (-1) Suppose you also want to standardize these scores to a "k" scale where the mean of...
On a recent quiz, the class mean was 69 with a standard deviation of 2.5. Calculate the z-score (to 2 decimal places) for a person who received score of 78 2-scoro Is this unusual? Yes or No On a recent quiz, the class mean was 69 with a standard deviation of 2.5. Calculate the z-score (to 2 decimal places) for a person who received score of 78 2-scoro Is this unusual? Yes or No
Part A. Score on 25 point test is normally distributed with mean 22 and standard deviation 5. You took a sample of 9 students. The mean for this group is 19.111111 Test the hypothesis that the performance of this group is different than the regular group. Use α=.05. What is the alternative hypothesis? What is the rejection region? Calculated z What is your decision? Yes or no? You believe that the group from an honors and would perform better than...
For an exam given to a class, the students' score ranged from 30 to 90, with a mean of 60. Based on the Empirical Rule for symmetric and bell-shapped data, which of the following is the most plausible value of the standard deviation? A. 0 OB. -5.3 C. 3 D. 56 E. 12
1. What position in the distribution corresponds to a z-score of z = .50? A. Below the mean by a distance equal to 0.5 standard deviations. B. Below the mean by 0.5 points. C. Above the mean by 0.5 points. D. Above the mean by a distance equal to 0.5 standard deviations. 2. Which of the following z-score values represents the location closest to the mean? A. z=+1.50 B. z=+1.00 C. z=-0.75 D. z=-2.00 3. For a population with µ...