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Given the student waited less than 45 minutes, what is the probability they waited less than 20 minutes? What is the standard deviation of waiting time?
To carry hypothesis tests or to compute confidence intervals for risk and odds rations, we use the natural log of the sample risk or odds ration in place of their actual values. We do because:
If a chemical compound is randomly selected and its pH X is determined, is X a continuous or discrete random variable? Explain. (Note: pH reading runs from 0 to 14)
Write the null and alternative hypotheses. In this context, describe the Type I error possible. How might such an error impact the company?
Determine the 2nd moment of X. Obtain an estimator of sigma using the method of moments and then compute the estimate for the data.
The probability mass function, Px(x), of a discrete random variable X is given by:
A company produces a women's bowling ball that is supposed to weigh exactly 14 pounds. Unfortunately, the company has a problem with the variability of the weight. In a sample of 12 of the bowling b
What is the lower limit of the 99% interval? Give your answer to three decimal places. What is the upper limit of the 99% interval? Give your answer to three decimal places.
If B discovers oil, the probability that A will also discover oil is increased by 20%. Assume that the chance of C discovering oil is independent of A and B. i) What is the probability that oil will
A sanitation department is interested in estimating the mean amount of garbage per bin for all bins in the city. In a random sample of 40 bins, the sample mean amount was 52.8 pounds and the sample
If fewer than 10 tickets are sold in the nal 10 minutes of sale before a particular draw, what is the probability that the top prize in that draw is $10,000,000 or more?
A web based software company is interested in estimating the proportion of individuals who use the Firefox browser. In a sample of 200 of individuals, 19 users stated that they used Firefox. Using t
Give an example representing a discrete probability distribution and another example representing a continuous probability distribution. Explain why your choices are discrete and continuous.
A company produces a women's bowling ball that is supposed to weigh exactly 14 pounds. Unfortunately, the company has a problem with the variability of the weight. In a sample of 7 of the bowling ba
For a sample size of 30 people who took the shots, the average number of absences was M=3.6 with a sum of squares =396. Did the administration of flu shots significantly reduce absentieeism?
Draw a Venn Diagram illustrating the region of interest for each of a)-d). Continuing with problem 5) above. Find the probabilities of the following events:
Another old wombat, slower but tougher, requires 24 seconds to cross the road, but it takes two cars to kill him. (A single car won't even slow him down.) If he starts out at a random time, determin
What values of X are consistent with the previous landscaping company's failure rate? What values of X indicate that the new landscaping company has a higher failure rate than the previous contractor?
Another old wombat, slower but tougher, requires 24 seconds to cross the road, but it takes two cars to kill him. (A single car won't even slow him down.) If he starts out at a random time, determi
Bell Curve, Inc., estimates the expected value and standard deviation of its total liability losses for the forthcoming year as $10 million and $3 million, respectively. If Bell Curve assumes that t
Suppose that the number of days of sick leave taken by employees has a distribution that is skewed right. Does this new information change your answer in (part a)? WHY?
The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airports. The maximum possible rating is 10.
The strength of one's immune system can be evaluated in several ways. One of the most popular methods involves measuring the concentration of adenosine triphosphate (ATP) in the blood.
A psychologist is examining the educational advantages of a preschool program and suspects that there will be significant differences in achievement based on preschool attendance.
A campaign manager believes that 28% of registered voters In A state will vote for their candidate. How large a sample is needed to estimate the true proportion of registered voters who will vote fo