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- The graph of a normally distributed random variable is given. Use the graph to answer the questions that follow. What is the mean?What is the standard deviation?What percentage of values should fall between 39 and 45?%Which value has a z-score of -2?+ + 69 78 87 96 105 114 Based on the graph of this normal distribution, a. The mean is b. The median is c. The mode is d. The standard deviation is + 123ASK YOUR TEACHER PRACTICE ANOTH The method of tree-ring dating gave the following years A.D. for an archaeological excavation site. Assume that the population of x values has an approximately normal distribution. 1,222 1,180 1,243 1,187 1,268 1,316 1,275 1,317 1,275 n USE SALT (a) Use a calculator with mean and standard deviation keys to find the sample mean year x and sample standard deviation s. (Round your answers to four decimal places.) X = A.D. S = yr (b) When finding an 90% confidence interval, what is the critical value for confidence level? (Give your answer to three decimal plāces.) t = What is the maximal margin of error when finding a 90% confidence interval for the mean of all tree-ring dates from this archaeological site? (Round your answer to the nearest whole number.) E = Find a 90% confidence interval for the mean of all tree-ring dates from this archaeological site. (Round your answers to the nearest whole number.) lower limit A.D. upper limit A.D. Need Help? Watch It…
- I only need B and CSuppose you calculate a z-score of -2.2 and the distribution is normal. Then which of the following is a correct interpretation? Group of answer choices None of the above are justified interpretations The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 2.5% of the observations. The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 5% of the observations The observation is about 2.2 times the variance less than the mean. This means it is less than all but roughly 2.5% of the observations. The observation is about 2.2 standard deviations less than the mean. This means it is less than all but roughly 5% of the observations.Which is NOT true about median? O It is not affected by extreme scores O It is used for skewed distributions O It is used for skewed and normal distribution O It is halfway between the two middle scores if there is an even number of scores
- KINDLY ANSWRR ALL scores of 800 children is given which follows a normal distribution with mean = 75 and variance = 25 1 if a child is chosen randomly , find the prob that the score is greatr tnan 72 2 what % of children have score less than 70 3 if 10 % of children obtian the best grades .find the lowest score the child can get to obtain the best gradeMa4. As a researcher, you want to see if limiting the amount of time students spend on Facebook each semester raises their GPA. You want to compare students GPA in the fall semester when there we no limitations on Facebook to their GPA in winter semester when each students is limited to no more than 1 hour a week on Facebook. After running the data, you see that student GPA violates the normal distribution. Which type of statistical test should you run to evaluate these data? Select one: a. Two sample t-Test b. Wilcox Signed Rank c. Paired t-Test d. Analysis of VarianceColleg 6.1.13 Question Help ?) Не Find the indicated z score. The graph depicts the standard normal distribution with mean 0 and standard deviation 1. Click to view page 1 of the table. Click to view page 2 of the table. ne 0.9871 The indicated z score is (Round to two decimal places as needed.)
