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The companying observation on stabilized viscosity (cP) for specimens of a certain grade of asphalt with 18% rubber added are from the article "viscosity Characteristics of Rubber-Modified Asphalts" (J. of Materials Civil Engr., 1996: 153_156):2781 2900 3013 2856 2888
a. What are the values of the sample mean and sample median?b. Calculate the sample variance using the computational formula. First subtract a convenient number from each observation.
Estimating the individual score using normal distribution - blood pressure higher than what amount?
Think about a real life situation that follows a linear equation, with the independent variable being years. What would the slope tell you about future years?
For a sample of 36 students in a class the mean score in Mathematics is 72 with a standard deviation of 7. Find the 95% confidence interval for the mean score.
When the rats In the sample reach 10 weeks old, each rat is weighed. The mean weight for this sample is M=974. Sketch the appropriate distribution, and locate the critical region for the alpha level =.05.
How large a sample must one take to be 90% confident that the estimate is within 0.05 of the true proportion of women over 55 who are widows?
Suppose that = $7600, is there adequate evidence to conclude that mean annual wage of people from this county is signicantly dierent than state mean?
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
Can we conclude that the mean time for a game is less than 3.50 hours? Use the .05 significance level.
Fixed costs of $9,200 per month and variable costs of 70 cents per unit produced. Each item is sold to retailers at a price that averages 90 cents.
Mean and standard deviation are 584.6 and 34.28
Suppose that during a basketball practice. Joe tries 3 shots from the free throw line; imagine further that he has a probability equal to 0.6 of making each shot and that the attempts are independent. Let 'X' be the number of baskets he makes in t..
Findout the probability using normal approximation for the provided values. Findout the specified probability from a table of Normal probabilities.
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