12, 15, 13,14,15,16,17,18
(a) Find the mean, write down the formula, follow by the answer
(b)Variances, write down the formula and answer
(b) Standard deviation write down the formula and answer
12, 15, 13,14,15,16,17,18 (a) Find the mean, write down the formula, follow by the answer (b)Variances,...
12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve.
For the follow ing scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation. 1,382; 1,376, 1,405; 1,216, 1,415 qo (a) Find the mean
12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve. 13. This question is worth 4 points...
Use the formula to find the standard error of the distribution of differences in sample means, x¯1-x¯2. Samples of size 110 from Population 1 with mean 94 and standard deviation 12 and samples of size 70 from Population 2 with mean 76 and standard deviation 15 Round your answer for the standard error to two decimal places.
Use the formula to find the standard error of the distribution of differences in sample means, x¯1-x¯2. Samples of size 120 from Population 1 with mean 81 and standard deviation 12 and samples of size 85 from Population 2 with mean 78 and standard deviation 15 Round your answer for the standard error to two decimal places. standard error =
218, 211, 215, 211, 215 a. Find the mean and the standard deviation (using either formula) b. Now change the score of 218 to 88 and find the new mean and standard deviation (using either formula). c. Describe how one extreme score influenced the mean and standard deviation.
12 Suppose the mean IQ score of people in a certain country is 105. Suppose the director of a college obtains a simple random sample of 40 students from that country and finds the mean IQ is 105 2 with a standard deviation of 13.7. Test the claim that the mean IQ score of people is more than 105 at the a = 0.05 level of significance. a. Write both null and alternative. Indicate the tail. b. Find test statistics...
12 and 13
12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve. 13. This question is...
Given the following formula: C 12 If the standard deviation is 1.7 and the mean is 43. what is the probability that the next data point will be greater than 2.097 Standard Normal Distribution Table POX 2.09) 0.0000 Excess your answer as a decimal value. Round Norden den
12-13 show work
12. Using a normal distribution and z score formula answer the following questions: a. Find the Z-score that cuts off the top 35% of the nornval curve b. Find the data value to the nearest whole number that cuts off the bottom 20% of the curve given that the mean is 75 and sample standard deviation is 5. c. Find the z scores that cut off the middle 50% of the normal curve. 13. This question is...