X 0 1 2 3 4 P(X) 0.2 0.2 0.11 0.43 ? Complete the distribution table and find Variance of X.
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- The dependent is variance inflation factor, make a decision whether it need to drop any variables.The mean of Binomial distribution is 3 and variance is. Find P(1 < x < 6)A distribution of scores is approximately normal with a mean of 78 and a standard deviation of 8.6. Which of the following equations can be used to find the score x above which 33 percent of the scores fall? (A) 0.44 = x – 78 (8.6)? (B) 0.67 x – 78 (8.6)? x – 78 8.6 (C) 0.33 x – 78 (D) 0.44 = 8.6 x – 78 8.6 (E) 0.67 %3D
- 1 Select one: ANB AUB NONE The variance of the following data equals: 0. 1 3 4 f (X) 1/ 3. 6/ Select one: NONE 4/3 6) 3.If Y is Normally distributed , and p(y < 170 ) = 0.14 p ( y > 200 ) = 0.03 then the values of the mean and variance of Y , respectively areCoffee with Meals A researcher wishes to determine the number of cups of coffee a customer drinks with an evening meal at a restaurant. X 0 1 2 3 4 PX 0.20 0.32 0.42 0.02 0.04 Find the mean. Round the answer to two decimal places as needed. Mean: μ= Find the variance. Round the answer to two decimal places as needed. Variance: σ^2= Find the standard deviation. Round the answer to two decimal places as needed. Standard deviation: σ=
- Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is the z-value for a score of 80? -2.0 -0.4 1.0 2.0 0.4Find x °x and Ps for all possible samples of 187 values taken from a Normally distributed population with u = 66.34 and o = 44.02 What is the mean of the population consisting of all possible sample means? %3D What is the standard deviation of the population consisting of all possible sample means? What is the variance of the population consisting of all possible sample means? %3D What is the mean of the population consisting of all possible sample variances? %3D (Round to 4 decimal places as needed) Vi (1,1) More Clear all Ask my instructorAssuming variance > 1, which of the following must be true? The sample variance is calculated based on the sample size rather than the degrees of freedom The data are normally distributed Standard deviation < variance The model will explain more than 50% of the variance of the dependent variable
- It is only appropriate and possible to calculate the variance and standard deviation as measures of variability for variables measured using a(n) _____ scale of measurement.Our environment is very sensitive to the amount of ozone in the upper atmosphere. The level of ozone normally found is 4.6 parts/million (ppm). A researcher believes that the current ozone level is at an excess level. The mean of 14 samples is 4.9 ppm with a variance of 1.2 Does the data support the claim at the 0.01 level? Assume the population distribution is approximately normal. Step 2 of 5 : Find the value of the test statistic. Round your answer to three decimal places.