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The KSW computer science aptitude test was given to 50 students. The following frequency distribution resulted from their scores. KSW Test Score 0-4 4-8 8-12 12-16 16-20 20-24 24-28 Frequency 4 8 8 20 6 3 1 (a) What are the class boundaries for the class with the largest frequency? (lower boundary) (upper boundary) (b) Give all the class midpoints associated with this frequency distribution. (Enter your answers from smallest to largest.) (smallest midpoint) (largest midpoint) (c) What is the class width? (d) Give the relative frequencies for the classes. (Give your answers correct to 2 decimal places.) (e) Draw a relative frequency histogram of the test scores. (Do this on paper. Your instructor may ask you to turn in this work.)
Suppose that the probability distribution of a random variable x can be described by the formula. Calculate the variance and standard deviation.
Proportions of defective chips are 4.0% and 6.0% respectively. Using a confidence level of 95%. Which statement is supported by data?
The results are shown here. At Alpha = .01, can it be concluded that the sessions help to improve the students' mathematical skills?
Mmen will have a heart attack in the next 5 years. How large a sample would we need to have an 80% chance of finding a significant difference if the true rate of heart disease in this group is 13%?
A producer of pleasure boats wants to maximize revenue during the next month. Two types of boats are sold, x1 and x2. Type x1 sells for $40,000 and type x2 sells for $30,000. The x1 boats require 10 weeks of labor and 600 board feet of lumber each..
How can you tell what are the solutions of a quadratic equation by looking at its graph? Explain.
The following sample data were obtained from three populations that did not follow a normal distribution. Compute the value of the test stastic. What is your decision on the null hypothesis?
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
To investigate the efficacy of a diet, a random sample of 16 male patients is drawn from a population of adult males using the diet. The weight of each individual in the sample is taken at the start of the diet and at a medical follow up 4 weeks l..
Use a bag of M&M TM candies and perform an examploe Chi-squared analysis based on your random sampling(s). State a hypothesis and a few reasons why it along with your Chi-squared analysis may be different from someone else's findings.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
For the grand opening, an arena has selected 5 finalists, each of whom will win a season ticket located in one of 5 sections: The upper balcony, lower balcony, main floor, courtside, or a luxury box.
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