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Compute the slope of the regression line for the data below:
X 3, 0, 3, 5, 3,
Y 7, 4, -2, 2, -3
In certain normal distribution of scores, mean is 50 and standard deviation is 4. Determine z-score corresponding to a score of 55.
A study wants to determine if taking fish oils can reduce depressive symptoms. A group of 50 volunteers who suffered from mild depression were randomly divided into two groups. Each person was given a three-month’s supply of capsules. One group was g..
For a sample of 120 students selected at random, what is the mean and variance of the number of students who watch this game?
Does age make a difference in the amount of savings a worker feels is needed to be secure at retirement? Suppose 210 workers in the 25-33 age category and 176 workers in the 34-52 age category were involved in this study.
question suppose that the price of stock a is aed 25 and its standard deviation is 5. the average market price for all
Identify and justify which type of sampling (random, stratified, systematic, cluster, convenience) is used in the following examples.
Professor Cox needs a volunteer amongst 30 students in his statistical applications course. The average age of his students is 25 years, with the standard deviation of 3 years.
A production process produces 90% non-defective parts. A sample of 10 parts from the production process is selected. What is the probability that the sample will contain 7 non-defective parts?
two parts are assembled. the distributions of x1 and x2 are normal with micro1 20 s1 0.3 and micro2 19.6 s2 0.4.
Estimate the mean monthly rent paid by the whole student population. what is the probability that the sample mean exceeds the population mean by more than %5.
You took the standard deviation of 4.5 minutes from a commuting friend and believe that that is the standard deviation for the area. Prepare a 95% confidence interval for the true average commuting time.
The buyer-believes that the differences are normally distributed and will use this sample to perform an appropriate test at a level of significance of 0.01.
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