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The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and participating in a study of risk factors for obesity. Body mass index is measured as the ratio of weight in kilograms to height in meters squared.
25 27 31 33 26 28 38 41 24 32 35 40
a) Compute the mean BMIb) Compute the standard deviation of BMIc) Compute the median BMId) Compute Q1 and Q3e) Are there outliers in the distribution of BMI (justify your answer)?
A sample of 4 axles is inspected each hour for process control purposes, and records are kept of the sample mean diameter. What will be the mean and the standard deviation of the numbers record.
A lab test is 95% effective in detecting a disease. The test gives a false positive (reports the patient has disease when they do not) for 1 % of the healthy population tested.
Estimate the probability the store will gross over $850 a) At least 3 out of 5 business days.
Student record revealed that 16 out of a random sample of 64 of student with loans. It supposed that current rate is persisting across all students. Compute probability that number of students with loans will be less than 375.
The student is studying education, is 0.8. What is the conditional probability that the student is studying education, given that she is a woman?
Consider the following two columns that describe different types of data: A. Nominal 1. Qualitative B. Discrete 2. Quantitative C. Ordinal D. Continuous. The correctly paired groupings of the two columns is:
Derive an expression for the closed loop transfer function: Because the output is related to the actuating signal by G(s), we have
A population consists of ten items, six of which are defective. In a sample of three items, what is the probability that exactly two are defective?
Are stock splits beneficial to stockholders? SNL Securities studied stock splits in the banking industry over an 18-month period and found that stock splits tended to increase the value of an individual stock holding.
What is the null hypothesis in a chi-squared test of independence? How many 'tails' can a chi-squared test have, one or two? In a regression analysis, what do the residuals from the fitted line add up to?
A powerful women's group has claimed that men and women differ in attitudes about sexual discrimination. A group of 50 men (group 1) and 40 women (group 2) were asked if they thought sexual discrimination is a problem in the United States.
What are some real life examples of the use of Chi-Square tests using contingency tables? Why is a test, which is testing significant differences among means called Analysis of Variance?
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