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Lewis earned 85 on his biology midterm and 81 on his history midterm. In the biology class the mean score was 79 with standard deviation 5. In the history class the mean score was 76 with standard deviation 3.
a) Convert each midterm score to a standard z score.
b) On which test did he do better compared to the rest of the class?
A Correlation matrix (correlation, coefficients and probability level under the hypothesis rho = 0) for a company's sales force (age, years of service, and current sales) is given below. Comment.
Probability using normal distribution.Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
Expand and aggregate plan using each of the following guidelines and complete the total cost for each plan. Which plan has the lowest total cost.
the population mean of monthly wages of all college graduates under age of 30. Interpret your answer in the context of the problem.
For following scores determine values of each expression: X: 4, 2, 1, & 5. åX, åX 2 , (åX) 2 , å(X-1).
According to the patient's history and physical examination. What are the chances of herniation if the MRI is positive?
Advertisers need to know which age groups are likely to see their ads. Purchasers of 120 copies of Cosmopolitan are shown by age group, (a) Make a bar chart and describe it. (b) Calculate expected frequencies for each class.
Nine percent of undergraduate students carry credit card balances greater than $7000. Presume 10 undergraduate students are selected randomly to be interviewed about credit card usage.
What is the probability that all three students pick exactly the same card?
Analyze the data using linear contrasts to make the following comparisons:
What decision should be made regarding the null hypothesis?
At the 5% level of significance, does this result support the conjecture?
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