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Twenty-five blood samples were selected by taking every seventh blood sample from racks holding 187 blood samples from the morning draw at a medical center. The white blood count (WBC) was measured using a Coulter Counter Model S. The mean WBC was 8.636 with a standard deviation of 3.9265. (a) Construct a 90 percent confidence interval for the true mean. (b) Why might normality be an issue here? (c) What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
In a certain college, 20% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, what is the probability that exactly 2 belong to an ethnic minority?
Suppose a restaurant business succeeds 60% of the time. Suppose that there are three such restaurants open in your city. When they don't compete with one another, it is reasonable to believe that their relative success would be independent.
A game involving a pair of dice pays you 3 with probability 17/36, costs you 2 with probability 14/36, and costs you 4 with probability 5/36. What is your probability of losing money in one play of the game?
Use PHStat to make a box-whisker plot. If PHSTAT has yet to be installed, calculate Xmin, Xmax, Q 1 , Q 3 and median using equation in Class Notes-Quartiles, Percentile & Dectiles.
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
However, if they lose the first contract, the president thinks that the probability of winning the second contract decreases to 48%. What is the probability that they win both contracts?
A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately describes the measures of central tendency?
What types of graphical presentation (histogram, dot plot, stem-and-leaf, bar chart, etc.) would you include? Explain your reasoning.
Suppose we select a sample of 40 tires and use a simulator to determine the tread life. What is the likelihood of finding that the sample mean is between 59,050 and 60,950?
Find a 96% confidence interval for the true percentage of all households that have central air conditioning. Write a sentence that interprets this interval.
From the given research, compare the major players better at batting than 20 years ago using five step hypothesis.
Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
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