Percentage of scores falling between a z of 1.54 and the mean.
=P( z > 1.54) - P (z > 0)
=0.4382 - 0.000
= 0.4382
So percentage of score falling between a z of 1.54 and the mean is 43.82%.
What is the percentage of cases falling between the pair of z scores of -2.58 and 1.05?
Question 4 10 pts Percentage of scores falling between z's of 50 and 1.25. Question 5 10 pts Percentage of scores falling between z's of -53 and +84 Question 6 10 pts On a normal distribution with a mean of 200 and a standard deviation of 50, what percentage of cases will fall between a raw score of 185 and 195?
What percentage of z-scores in the standard normal distribution are between z = -0.33 and z = 0.33? a. 25.86% b. 37.07% c. 12.93% d. 50.00%
For each of the following questions: a. Calculate the z-scores (show your work) b. Draw the theoretical normal curve and locate the raw scores on the curve. c. Shade the area under the curve appropriate to the question or probability of interest. d. Write a complete sentence interpretation. If a distribution of scores has a mean of 75 and a standard deviation of 5 then: 1. What is the probability of a score falling between a raw score of 70...
(12 pts) Use the table of z-scores and percentiles to find the percentage of data items in a normal distribution that: a. Lie above z=.3 b. Lie below z=-0.9 c. Lie between z=-2 and z=-0.6
5. Suppose a set of math test scores is normally distributed with a mean of 100 (you do not need to know the standard deviation to answer this question, but you may find it helpful to plug in a standard deviation of your choice). If you randomly select a sample of scores from this distribution, which of the following probabilities is higher? Explain your answer. • The probability of the sample mean falling between 100 and 105 with a sample...
The scores on a lab test are normally distributed with mean of 200. If the standard deviation is 20, find: a) The score that is 2 standard deviations below the mean b) The percentage of scores that fall between 180 and 240 c) The percentage of scores above 240 d) The percentage of scores between 200 and 260 e) The percentage of scores below 140
Psych 2100 (Statistical Methods) Z-scores and Percentile practice problems се A statistician studied the records of rainfall for a particular geographical locale She found that the average monthly rainfall (in inches) was normally distribut with a mean 8.2 and a standard deviation ơ: 2.4. Please answer the following ed 1. What percentage of scores are at or below 12.4? 2. What percentage of scores are at or above 14.3? 3. What percentage of scores are at or above 3.5? 4....
Approximately what percentage of people would have scores lower than an individual with a z-score of 1.65 in a normally distributed sample? Question 5 options: a) 95% b) 98% c) It is not possible to calculate this unless the mean and standard deviation are given d) 1%
7. Differentiating normal z scores from all z scores Aa Aa Recall that z scores have the same shape as the original raw scores. That is, if the the raw scores are normally distributed, then when you transform them to z scores, these z scores are also normally distributed. Here we will cal such normally distributed z scores "normal z scores. Consider the following statements. Some of these statements are necessarily true for all z scores, some of these statements...