Calculate the standard deviation of the following scores. Use the formula for the population standard deviation. You can find it in Keyton's online appendix to your test. (Click on the pdf in the new window, then scroll down to page 4. It will give you two ways to compute the SD--we'l| cover both in class.) Or you can use the online calculator I showed you in class. Make sure that your answer goes out to two decimal places even if it is a round number (e.g., 4.00). The scores for the variable X are below: hO-bUINUIWCDQCD Your Answer: :1 Answer [> View hint for Question 1 Question 2 (4 points) Consider the mean and standard deviation from the first question. Is the mean an accurate predictor or estimate of the scores in the sample? Why or why not? Question 3 (4 points) Provide the z-score for the following data. The formula is (scoremean)/sd, and is in your notes. mean = 60 standard deviation = 20 raw score = 41 Your answer should be rounded to 2 decimal places. Your Answer: :l Answer Question 4 (4 points) This is a new one for you but it's not that hard and illustrative of how informative 2 scores are. In this case, you are given the z-score, standard deviation, and the mean, and you have to calculate the raw score. The formula is x=z*sd+mean (remember your order of operations). 2 = 1.10 standard deviation = 1.10 mean = 3.50 Your answer must be rounded to 2 decimal places (e.g., 4.00). Your Answer: "Eyeball" (look at) the previous question. Can you tell just by looking at the z-score if the raw score should be greater, equal to, or less than the mean? How can you tell (or not)? Question 6 (4 points) For the following data, compute the percentage of cases that lie below or to the left of the z-score that is obtained when X = 200, sd = 40, and mean = 160. Your answer must be in decimal form (e.g., .50) or else D2L will mark it wrong. Your Answer: :l Answer Question 7 (4 points) For the following data, compute the percentage of cases that lie above or to the right of the z-score that is obtained when X = 90, sd = 20, and mean = 110. Your answer must be in decimal form (e.g., .50) or else D2L will mark it wrong. Your Answer: For the following data, compute the percentage of cases that lie above or to the right of the z-score that is obtained when X = 75, sd = 10, and mean = 70. Your answer must be in decimal form (e.g., .50) or else D2L will mark it wrong. Your Answer: Answer Question 9 (4 points) For the following data, compute the percentage of cases that lie above or to the right of the z-score that is obtained when X = 140, sd = 20, and mean = 150. Your answer must be in decimal form (e.g., .50) or else D2L will mark it wrong. Your Answer: Answer Question 10 (4 points) Consider a data set that has a mean = 10 and SD = 2. What is the percent of case that lie between X1=8 and X2=12? Your answer must be in decimal form (e.g., .50) or else D2L will mark it wrong